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Related Experiment Videos

Effect of phenotypic variation on kin selection.

R Boyd1, P J Richerson

  • 1Division of Environmental Studies, University of California, Davis, California 95616.

Proceedings of the National Academy of Sciences of the United States of America
|December 1, 1980
PubMed
Summary

This study presents a model for the evolution of traits influenced by related individuals. It finds that low heritability can significantly increase altruistic behaviors beyond predictions from Hamilton's rule.

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Area of Science:

  • Evolutionary biology
  • Quantitative genetics
  • Behavioral ecology

Background:

  • Understanding the evolution of social behaviors, particularly altruism, is a central challenge in evolutionary biology.
  • Hamilton's rule (k > 1/r) provides a framework for predicting the conditions under which altruistic behaviors evolve based on relatedness and fitness costs/benefits.

Purpose of the Study:

  • To derive an expression for the equilibrium of mean phenotypic values in quantitative traits under social selection.
  • To investigate how individual phenotype and group mean phenotype influence fitness.
  • To compare model predictions with Hamilton's rule under varying selection strengths and heritabilities.

Main Methods:

  • Development of a mathematical model for the equilibrium of mean phenotypic values.

Related Experiment Videos

  • Analysis of the model under conditions of weak and strong selection.
  • Inclusion of individual phenotype, group mean phenotype, heritability, and relatedness as key parameters.

    • Main Results:

    • An expression for the equilibrium mean phenotypic value was derived, considering both individual and related group phenotypes.
    • Under weak selection, the equilibrium mean aligns with predictions from Hamilton's k > 1/r rule.
    • Under strong selection, the equilibrium mean is significantly influenced by the heritability of the trait, with low heritability promoting greater "altruism" than predicted by Hamilton's rule.

    Conclusions:

    • Hamilton's rule provides a good approximation for altruistic trait evolution under weak selection.
    • Heritability plays a critical role in modulating the evolution of altruism under strong selection.
    • Low heritability can lead to increased levels of altruistic behavior, deviating from predictions based solely on relatedness and fitness ratios.