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Group selection among alternative evolutionarily stable strategies.

R Boyd1, P J Richerson

  • 1Department of Anthropology, University of California, Los Angeles 90024.

Journal of Theoretical Biology
|August 9, 1990
PubMed
Summary
This summary is machine-generated.

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Group selection can favor strategies with lower extinction rates when multiple evolutionarily stable strategies (ESS) exist. This occurs even with large groups and high migration, especially for culturally acquired behaviors.

Area of Science:

  • Evolutionary biology
  • Behavioral ecology
  • Game theory

Background:

  • Many models of social behavior evolution incorporate multiple evolutionarily stable strategies (ESS).
  • Examples include coordination games, contests, mutualism, reciprocity, and sexual selection.

Purpose of the Study:

  • To investigate how group selection operates when multiple evolutionarily stable strategies (ESS) are present.
  • To identify conditions under which group selection can drive the spread of specific strategies.

Main Methods:

  • Theoretical modeling of group selection dynamics.
  • Analysis of strategy spread based on extinction rates and colonization probability.

Main Results:

  • Group selection can promote strategies with the lowest extinction rates or highest colonization success.

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  • This effect persists even with large group sizes and substantial migration rates.
  • Key requirements include a significant fraction of individuals from one group forming new groups and strong within-group selection relative to migration.

    • Conclusions:

    • Group selection provides a mechanism for the spread of successful strategies in systems with multiple evolutionarily stable strategies (ESS).
    • Culturally acquired behavioral variation may be particularly susceptible to this form of group selection.