Grandmothering life histories and human pair bonding

Proceedings of the National Academy of Sciences of the United States of America
James E CoxworthKristen Hawkes

Abstract

The evolution of distinctively human life history and social organization is generally attributed to paternal provisioning based on pair bonds. Here we develop an alternative argument that connects the evolution of human pair bonds to the male-biased mating sex ratios that accompanied the evolution of human life history. We simulate an agent-based model of the grandmother hypothesis, compare simulated sex ratios to data on great apes and human hunter-gatherers, and note associations between a preponderance of males and mate guarding across taxa. Then we explore a recent model that highlights the importance of mating sex ratios for differences between birds and mammals and conclude that lessons for human evolution cannot ignore mammalian reproductive constraints. In contradiction to our claim that male-biased sex ratios are characteristically human, female-biased ratios are reported in some populations. We consider the likelihood that fertile men are undercounted and conclude that the mate-guarding hypothesis for human pair bonds gains strength from explicit links with our grandmothering life history.

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Citations

Jan 23, 2016·Journal of Theoretical Biology·Matthew H ChanPeter S Kim
Dec 25, 2015·Proceedings of the National Academy of Sciences of the United States of America·Kristen Hawkes
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