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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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Conditional Behaviors and Inclusive Fitness

Conditional Behaviors and Inclusive Fitness

Chapter:
(p.71) Chapter Six Conditional Behaviors and Inclusive Fitness
Source:
Social Evolution and Inclusive Fitness Theory
Author(s):

James A.R. Marshall

Publisher:
Princeton University Press
DOI:10.23943/princeton/9780691161563.003.0006

This chapter examines social behaviors that are expressed conditional on the phenotype of others. David Queller argued that inclusive fitness analyses need to be done on a per-behavior basis, citing as an example the decision over whether to reproduce directly, and whether to aid a reproductive. Queller showed that inclusive fitness predictions are only sensible when one analyzes what an individual should do, given it finds itself in a particular behavioral role. The chapter first provides an overview of implicit and explicit conditionality and presents two classic examples: William D. Hamilton's greenbeard traits and Robert Trivers's theory of reciprocal cooperation. It also introduces an extension of Hamilton's rule to deal with explicitly conditional behaviors; this extension features a measure of phenotypic assortment that appears not to be the classic genetic relatedness of Hamilton's rule.

Keywords:   social behaviors, phenotype, inclusive fitness, greenbeard traits, reciprocal cooperation, Hamilton's rule, conditional behaviors, phenotypic assortment, relatedness

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