Evolution of non-kin cooperation: social assortment by cooperative phenotype in guppies

Royal Society Open Science
Josefine Bohr BraskSafi K Darden

Abstract

Cooperation among non-kin constitutes a conundrum for evolutionary biology. Theory suggests that non-kin cooperation can evolve if individuals differ consistently in their cooperative phenotypes and assort socially by these, such that cooperative individuals interact predominantly with one another. However, our knowledge of the role of cooperative phenotypes in the social structuring of real-world animal populations is minimal. In this study, we investigated cooperative phenotypes and their link to social structure in wild Trinidadian guppies (Poecilia reticulata). We first investigated whether wild guppies are repeatable in their individual levels of cooperativeness (i.e. have cooperative phenotypes) and found evidence for this in seven out of eight populations, a result which was mostly driven by females. We then examined the social network structure of one of these populations where the expected fitness impact of cooperative contexts is relatively high, and found assortment by cooperativeness, but not by genetic relatedness. By contrast, and in accordance with our expectations, we did not find assortment by cooperativeness in a population where the expected fitness impact of cooperative contexts is lower. Our results provide...Continue Reading

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Citations

Sep 10, 2020·Proceedings. Biological Sciences·Safi K DardenDarren P Croft
Jul 18, 2019·Royal Society Open Science·Peter Woodford
Jun 9, 2021·Biological Reviews of the Cambridge Philosophical Society·Samin GokcekusJosh A Firth
Jul 8, 2021·Journal of Evolutionary Biology·Jordan S Martin, Adrian V Jaeggi
Jul 15, 2021·Trends in Ecology & Evolution·Samin GokcekusBen C Sheldon

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Software Mentioned

assortnet R - package
GENEPOP
lmPerm R - package
Ethovision XT
GENALEX

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