Testosterone and paternal care in East African foragers and pastoralists

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Testosterone and paternal care in East African foragers and pastoralists.

The 'challenge hypothesis' posits that testosterone facilitates reproductive effort (investment in male-male competition and mate-seeking) at the expense of parenting effort (investment in offspring and mates). Multiple studies, primarily in North America, have shown that men in committed relationships, fathers, or both maintain lower levels of testosterone than unpaired men. Data from non-west...

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We model interhousehold transfers between nomadic livestock herders as the statedependent consequence of individuals’ strategic interdependence resulting from the existence of multiple, opposing externalities. A public good security externality among individuals sharing a social (e.g., ethnic) identity in a potentially hostile environment creates incentives to band together. Self-interested int...

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Lactase Persistence Alleles Reveal Partial East African Ancestry of Southern African Khoe Pastoralists

The ability to digest milk into adulthood, lactase persistence (LP), as well as specific genetic variants associated with LP, is heterogeneously distributed in global populations. These variants were most likely targets of selection when some populations converted from hunter-gatherer to pastoralist or farming lifestyles. Specific LP polymorphisms are associated with particular geographic regio...

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Food Aid Targeting, Shocks and Private Transfers Among East African Pastoralists

Public transfers of food aid are intended largely to support vulnerable populations in times of stress. We use high frequency panel data among Ethiopian and Kenyan pastoralists to test the efficacy of food aid targeting under three different targeting modalities, food aid’s responsiveness to different types of covariate shocks, and its relationship to private transfers. We find that, in this re...

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The androgen receptor (AR) gene polymorphism in humans is linked to aggression and may also be linked to reproduction. Here we report associations between AR gene polymorphism and aggression and reproduction in two small-scale societies in northern Tanzania (Africa)--the Hadza (monogamous foragers) and the Datoga (polygynous pastoralists). We secured self-reports of aggression and assessed gene...

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ژورنال

عنوان ژورنال: Proceedings of the Royal Society B: Biological Sciences

سال: 2008

ISSN: 0962-8452,1471-2954

DOI: 10.1098/rspb.2008.1028