Competition for Cooperation: variability, benefits and heritability of relational wealth in hunter-gatherers

Chaudhary, N., Salali, G.D., Thompson, J., Rey, A., Gerbault, P., Stevenson, E.G., Dyble, M., Smith, D., Mace, R., Vinicius, L. and Migliano, A.B. 2016. Competition for Cooperation: variability, benefits and heritability of relational wealth in hunter-gatherers. Scientific Reports. 6, p. 29120 29120. https://doi.org/10.1038/srep29120

TitleCompetition for Cooperation: variability, benefits and heritability of relational wealth in hunter-gatherers
AuthorsChaudhary, N., Salali, G.D., Thompson, J., Rey, A., Gerbault, P., Stevenson, E.G., Dyble, M., Smith, D., Mace, R., Vinicius, L. and Migliano, A.B.
Abstract

Many defining human characteristics including theory of mind, culture and language relate to our sociality, and facilitate the formation and maintenance of cooperative relationships. Therefore, deciphering the context in which our sociality evolved is invaluable in understanding what makes us unique as a species. Much work has emphasised group-level competition, such as warfare, in moulding human cooperation and sociality. However, competition and cooperation also occur within groups; and inter-individual differences in sociality have reported fitness implications in numerous non-human taxa. Here we investigate whether differential access to cooperation (relational wealth) is likely to lead to variation in fitness at the individual level among BaYaka hunter-gatherers. Using economic gift games we find that relational wealth: a) displays individual-level variation; b) provides advantages in buffering food risk, and is positively associated with body mass index (BMI) and female fertility; c) is partially heritable. These results highlight that individual-level processes may have been fundamental in the extension of human cooperation beyond small units of related individuals, and in shaping our sociality. Additionally, the findings offer insight in to trends related to human sociality found from research in other fields such as psychology and epidemiology.

Article number29120
JournalScientific Reports
Journal citation6, p. 29120
ISSN2045-2322
Year2016
PublisherNature Publishing Group
Publisher's version
Digital Object Identifier (DOI)https://doi.org/10.1038/srep29120
Publication dates
Published12 Jul 2016
LicenseCC BY 4.0

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