Intergroup encounters in wild white-faced capuchins (Cebus capucinus) |
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Authors: | Susan Perry |
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Institution: | (1) Department of Anthropology, The University of Michigan, 48109 Ann Arbor, Michigan;(2) Department of Anthropology, UCLA, 405 Hilgard Avenue, 90095 Los Angeles, California |
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Abstract: | Wrangham (1980) hypothesized that knowledge of the nature of intergroup encounters is crucial to understanding primate social
relationships and social organization. I studied a single social group of wild white-faced capuchins over a period of 26 months
and observed 44 encounters between social groups during 3703 hr of observation. All intergroup encounters consisted of predominantly
hostile social interactions. However, nonaggressive interactions between males of different social groups occurred in a few
cases. Adult males were the sole participants in 39 encounters and the primary participants in all 44 encounters. The alpha
male was the most frequent participant. High-ranking females participated aggressively in five encounters, and low-ranking
females never participated. There was no stable intergroup dominance hierarchy. I hypothesize that the need for male-male
cooperation in intergroup aggression is an important factor influencing the quality of intragroup male-male relationships.
Behavior during intergroup encounters is consistent with the idea that intergroup behavior is related to male reproductive
strategies, but inconsistent with the idea that intergroup aggression is related to female defense of resources. The possibility
that males are “hired guns” (Wrangham, 1980) cannot be ruled out. |
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Keywords: | Cebus capucinus intergroup aggression capuchins male reproductive strategies |
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