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Causes, Consequences, and Kin Bias of Human Group Fissions

Walker, Robert S., Hill, Kim R.·2014·Human Nature
DOI 10.1007/s12110-014-9209-0
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Abstract

Fissions of human communities are monumental occasions with consequences for cultural and genetic variation and divergence through time by means of serial founder effects. An ethnographic review shows that most human group fissions are fueled primarily by internal political conflict and secondarily by resource scarcity. As found for other social animals, human fissions lead to subgroups that have higher levels of relatedness as compared with the original community because of kin-biased assortment known as the lineal effect. Fission processes that increase the average relatedness of subgroups are important because relatedness governs how strongly kin/group selection favors social behaviors such as warfare, peacekeeping, and other forms of collection action. However, random individual assortment is not an appropriate null model for evaluating lineage assortment because nuclear families and extended households are expected to remain together, which in and of itself forces higher relatedness in smaller subgroups. We develop a lineage assortment index where low values represent subgroups with coefficients of relatedness near those expected if nuclear and extended households had chosen to associate into random groupings. Two fissions of Ache villages (Paraguay) are examples of this type of fission with a low lineage assortment index not significantly different from zero as evaluated with controlled simulations. On the other extreme, a lineage assortment index near unity represents…

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Metadata

Authors
Walker, R. S., & Hill, K. R.
Venue
Human Nature
Publisher
Springer Science and Business Media LLC
Published
2014-07-24
Volume
25
Issue
4
Pages
465-475
ISSN
  • 1045-6767
  • 1936-4776
DOI
10.1007/s12110-014-9209-0
Cited by
21
References
1
Language
en
Licence
www.springer.com/tdm (tdm)

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Walker, R. S., & Hill, K. R. (2014). Causes, Consequences, and Kin Bias of Human Group Fissions. Human Nature. https://doi.org/10.1007/s12110-014-9209-0