Let the Right One In: A Microeconomic Approach to Partner Choice in Mutualisms

	Let the Right One In: A Microeconomic Approach to Partner Choice in Mutualisms
	Archetti M 1,2; Ubeda F 3; Yu DW*4; Fudenberg D 2; Green J 2; Pierce NE 1; dougwyu@gmail.com
	2011
发表期刊	AMERICAN NATURALIST
卷号	177 期号:1 页码:75-85
合作性质	其它
摘要	One of the main problems impeding the evolution of cooperation is partner choice. When information is asymmetric (the quality of a potential partner is known only to himself), it may seem that partner choice is not possible without signaling. Many mutualisms, however, exist without signaling, and the mechanisms by which hosts might select the right partners are unclear. Here we propose a general mechanism of partner choice, "screening," that is similar to the economic theory of mechanism design. Imposing the appropriate costs and rewards may induce the informed individuals to screen themselves according to their types and therefore allow a noninformed individual to establish associations with the correct partners in the absence of signaling. Several types of biological symbioses are good candidates for screening, including bobtail squid, ant-plants, gut microbiomes, and many animal and plant species that produce reactive oxygen species. We describe a series of diagnostic tests for screening. Screening games can apply to the cases where by-products, partner fidelity feedback, or host sanctions do not apply, therefore explaining the evolution of mutualism in systems where it is impossible for potential symbionts to signal their cooperativeness beforehand and where the host does not punish symbiont misbehavior.
关键词	Cooperation Symbiosis Microbiome Vibrio Fischeri Virulence Parasitism
资助者	We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.).
收录类别	SCI
语种	英语
资助者	We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.). ; We received funding from National Science Foundation grant SES-0750480 awarded to N.E.P., J.G., and D.F. under the aegis of a grant from the European Science Foundation/European Collab- orative Research/the Evolution of Cooperation and Trad- ing (ESF/EUROCORES/TECT) to the BIOCONTRACT consortium that also included D.W.Y., U. Dieckmann, F. Dionisio, D.F., J.G., J. Orivel, N.E.P., F.U ´ ., and I. Scheuring, and we also received funding from the Yunnan provincial government ( 20080A001) and the Chinese Academy of Sciences (0902281081; awarded to D.W.Y.).
文献类型	期刊论文
条目标识符	http://ir.kiz.ac.cn/handle/152453/10462
专题	科研部门_生态学与环境保护中心（俞维理）遗传资源与进化国家重点实验室
通讯作者	dougwyu@gmail.com
作者单位	1.Department of Organismic and Evolutionary Biology, Harvard University, Cambridge, Massachusetts 02138 2.Department of Economics, Harvard University, Cambridge, Massachusetts 02138 3.Department of Ecology and Evolutionary Biology, University of Tennessee, Knoxville, Tennessee 37996 4.Ecology, Conservation, and Environment Center and State Key Laboratory of Genetic Resources and Evolution, Kunming Institute of Zoology, Chinese Academy of Science, Kunming, Yunnan, 650223 China; and School of Biological Sciences, University of East Anglia, Norwich, Norfolk NR4 7TJ, United Kingdom
推荐引用方式 GB/T 7714	Archetti M,Ubeda F,Yu DW*,et al. Let the Right One In: A Microeconomic Approach to Partner Choice in Mutualisms[J]. AMERICAN NATURALIST,2011,177(1):75-85.
APA	Archetti M.,Ubeda F.,Yu DW*.,Fudenberg D.,Green J.,...&dougwyu@gmail.com.(2011).Let the Right One In: A Microeconomic Approach to Partner Choice in Mutualisms.AMERICAN NATURALIST,177(1),75-85.
MLA	Archetti M,et al."Let the Right One In: A Microeconomic Approach to Partner Choice in Mutualisms".AMERICAN NATURALIST 177.1(2011):75-85.

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