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Social Evolution and Inclusive Fitness TheoryAn Introduction$
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James A.R. Marshall

Print publication date: 2015

Print ISBN-13: 9780691161563

Published to Princeton Scholarship Online: October 2017

DOI: 10.23943/princeton/9780691161563.001.0001

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Variants of Hamilton’s Rule and Evolutionary Explanations

Variants of Hamilton’s Rule and Evolutionary Explanations

Chapter:
(p.78) Chapter Seven Variants of Hamilton’s Rule and Evolutionary Explanations
Source:
Social Evolution and Inclusive Fitness Theory
Author(s):

James A.R. Marshall

Publisher:
Princeton University Press
DOI:10.23943/princeton/9780691161563.003.0007

This chapter examines four variants of Hamilton's rule and how they give different evolutionary explanations for certain social behaviors such as greenbeard traits. These variants are: HR1, which extends Hamilton's rule with a synergistic coefficient capturing the deviation from additivity of fitness interactions; HR2, which deals with the conditional expression of phenotype; HR3, which is concerned with fitness as partial regression; and HR4, the geometric view of relatedness. These variants differ in how they treat the three key parameters of the original: “relatedness,” “cost,” and “benefit.” The chapter also considers how the nongenetic explanation of the evolution of altruism can actually be recast in a version with genetic relatedness, and how geometric relatedness underlies phenotypic assortment. Finally, it discusses different viewpoints on conditional behaviors.

Keywords:   evolution, social behaviors, greenbeard traits, Hamilton's rule, synergistic coefficient, fitness, phenotype, relatedness, conditional behaviors, phenotypic assortment

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