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Comparative study of reproductive skew and pair‐bond stability using genealogies from 80 small‐scale human societies
Author(s) -
Ellsworth Ryan M.,
Shenk Mary K.,
Bailey Drew H.,
Walker Robert S.
Publication year - 2015
Publication title -
american journal of human biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.559
H-Index - 81
eISSN - 1520-6300
pISSN - 1042-0533
DOI - 10.1002/ajhb.22785
Subject(s) - skew , scale (ratio) , demography , evolutionary biology , genealogy , geography , biology , sociology , history , computer science , cartography , telecommunications
Objectives Genealogies contain information on the prevalence of different sibling types that result from past reproductive behavior. Full sibling sets stem from stable monogamy, paternal half siblings primarily indicate male reproductive skew, and maternal half siblings reflect unstable pair bonds. Methods Full and half sibling types are calculated for a total of 61,181 siblings from published genealogies for 80 small‐scale societies, including foragers, horticulturalists, agriculturalists, and pastoralists from around the world. Results Most siblings are full (61%) followed by paternal half siblings (27%) and maternal half siblings (13%). Paternal half siblings are positively correlated with more polygynous marriages, higher at low latitudes, and slightly higher in nonforagers, Maternal half sibling fractions are slightly higher at low latitudes but do not vary with subsistence. Partible paternity societies in Amazonia have more paternal half siblings indicating higher male reproductive skew. Conclusions Sibling counts from genealogies provide a convenient method to simultaneously investigate the reproductive skew and pair‐bond stability dimensions of human mating systems cross‐culturally. Am. J. Hum. Biol. 28:335–342, 2016. © 2015 Wiley Periodicals, Inc.