The evolution of cooperation by the Hankshaw effect

Evolution; International Journal of Organic Evolution
Sarah P HammarlundBenjamin Kerr

Abstract

The evolution of cooperation-costly behavior that benefits others-faces one clear obstacle. Namely, cooperators are always at a competitive disadvantage relative to defectors, individuals that reap the benefits, but evade the cost of cooperation. One solution to this problem involves genetic hitchhiking, where the allele encoding cooperation becomes linked to a beneficial mutation, allowing cooperation to rise in abundance. Here, we explore hitchhiking in the context of adaptation to a stressful environment by cooperators and defectors with spatially limited dispersal. Under such conditions, clustered cooperators reach higher local densities, thereby experiencing more mutational opportunities than defectors. Thus, the allele encoding cooperation has a greater probability of hitchhiking with alleles conferring stress adaptation. We label this probabilistic enhancement the "Hankshaw effect" after the character Sissy Hankshaw, whose anomalously large thumbs made her a singularly effective hitchhiker. Using an agent-based model, we reveal a broad set of conditions that allow the evolution of cooperation through this effect. Additionally, we show that spite, a costly behavior that harms others, can evolve by the Hankshaw effect. Whi...Continue Reading

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Citations

Dec 31, 2016·Journal of Evolutionary Biology·B D ConnellyC M Waters
Nov 11, 2019·Evolution; International Journal of Organic Evolution·Sonia Singhal
Jul 20, 2019·Proceedings of the National Academy of Sciences of the United States of America·Sarah P Hammarlund, William R Harcombe

Related Concepts

Alleles
Metazoa
Collaboration
Biological Evolution
Alleles
Environment
Cooper
Adaptation
Adaptive Response to Oxidative Stress

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