Spatial structure often inhibits the evolution of cooperation in the snowdrift game

Christoph Hauert () and Michael Doebeli
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Christoph Hauert: University of British Columbia
Michael Doebeli: University of British Columbia

Nature, 2004, vol. 428, issue 6983, 643-646

Abstract: Abstract Understanding the emergence of cooperation is a fundamental problem in evolutionary biology1. Evolutionary game theory2,3 has become a powerful framework with which to investigate this problem. Two simple games have attracted most attention in theoretical and experimental studies: the Prisoner's Dilemma4 and the snowdrift game (also known as the hawk–dove or chicken game)5. In the Prisoner's Dilemma, the non-cooperative state is evolutionarily stable, which has inspired numerous investigations of suitable extensions that enable cooperative behaviour to persist. In particular, on the basis of spatial extensions of the Prisoner's Dilemma, it is widely accepted that spatial structure promotes the evolution of cooperation6,7,8. Here we show that no such general predictions can be made for the effects of spatial structure in the snowdrift game. In unstructured snowdrift games, intermediate levels of cooperation persist. Unexpectedly, spatial structure reduces the proportion of cooperators for a wide range of parameters. In particular, spatial structure eliminates cooperation if the cost-to-benefit ratio of cooperation is high. Our results caution against the common belief that spatial structure is necessarily beneficial for cooperative behaviour.

Date: 2004
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DOI: 10.1038/nature02360

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