AI Article Synopsis
- The unique traits of human life history and social structures are usually thought to have developed due to fatherly support sustained by couple relationships.
- Researchers argue that these pair bonds may actually be tied to male-biased sex ratios, which played a role in the evolution of human life history.
- Their findings suggest that the dynamics of sex ratios, often favoring males, can impact mating behaviors and are significant for understanding human evolution, even as some populations show female-biased ratios, hinting at potential underreporting of fertile males.
Article 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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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC4586877 | PMC |
| http://dx.doi.org/10.1073/pnas.1599993112 | DOI Listing |
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