Abstract
Sex differences in physical aggression occur across human cultures and are thought to be influenced by active sex role reinforcement. However, sex differences in aggression also exist in our close evolutionary relatives, chimpanzees, who do not engage in active teaching, but do exhibit long juvenile periods and complex social systems that allow differential experience to shape behavior. Here we ask whether early life exposure to aggression is sexually dimorphic in wild chimpanzees and, if so, whether other aspects of early sociality contribute to this difference. Using 13 y of all-occurrence aggression data collected from the Kanyawara community of chimpanzees (2005 to 2017), we determined that young male chimpanzees were victims of aggression more often than females by between 4 and 5 (i.e., early in juvenility). Combining long-term aggression data with data from a targeted study of social development (2015 to 2017), we found that two potential risk factors for aggression—time spent near adult males and time spent away from mothers—did not differ between young males and females. Instead, the major risk factor for receiving aggression was the amount of aggression that young chimpanzees displayed, which was higher for males than females throughout the juvenile period. In multivariate models, sex did not mediate this relationship, suggesting that other chimpanzees did not target young males specifically, but instead responded to individual behavior that differed by sex. Thus, social experience differed by sex even in the absence of explicit gender socialization, but experiential differences were shaped by early-emerging sex differences in behavior.
Funder
National Science Foundation
HHS | NIH | National Institute on Aging
Leakey Foundation
Wenner-Gren Foundation
Nacey Maggioncalda Foundation
American Philosophical Society
Publisher
Proceedings of the National Academy of Sciences
Reference92 articles.
1. Ecology, Sexual Selection, and the Evolution of Mating Systems
2. T. Clutton-Brock , Mammal Societies (John Wiley & Sons, 2016).
3. Staying alive: Evolution, culture, and women's intrasexual aggression
4. A. Campbell , “Sex differences in aggression” in Oxford Handbook of Evolutionary Psychology, R. Dunbar , R. I. M. Dunbar , L. Barret , Eds. (Oxford University Press, Oxford, UK, 2007), pp. 365–382.
5. The prevalence of very frequent physical fighting among boys and girls in 27 countries and cities: Regional and gender differences;Swahn;J. Environ. Public Health,2013
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