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Cooperative Boundary Populations: the Evolution of Cooperation on Mortality Risk Gradients

✍ Scribed by WILLIAM HARMS

Publisher: Elsevier Science
Year: 2001
Tongue: English
Weight: 425 KB
Volume: 213
Category: Article
ISSN: 0022-5193
DOI: 10.1006/jtbi.2001.2424

No coin nor oath required. For personal study only.

✦ Synopsis

Cooperative or altruistic behavior is known to be vulnerable to destructive exploitation in the absence of spatial segregation and perceptual discrimination on the part of cooperators. In this study, a non-standard, agent-based, spatially explicit model of the evolution of cooperation shows that spatial gradients of increasing individual mortality risk can allow cooperative subpopulations to persist among players randomly matched for one-shot Prisoner's Dilemma. Further, the dynamically stable cooperator population formed on the gradient at the boundary of the survivable non-cooperative range provides ideal conditions for the evolution of discriminating strategies such as tit-for-tat. It is suggested that such gradients may commonly exist at the boundaries of the ranges of existing populations, providing a new basic mechanism for the evolution of cooperation.

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