Female Competition over Core Areas in Pan Troglodytes Schweinfurthii, Kibale National Park, Uganda
Kahlenberg 2008 Core areas.pdf (273.6Kb)
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CitationKahlenberg, Sonya M., Melissa Emery Thompson, and Richard W. Wrangham. 2008. Female competition over core areas in pan troglodytes schweinfurthii, Kibale National Park, Uganda. International Journal of Primatology 29(4): 931–947.
AbstractAggression is rare among wild female chimpanzees. However, in the
Kanyawara chimpanzee community in Kibale National Park, Uganda, stable use of food-rich core areas is linked to increased reproductive success, suggesting that contest competition might occur over access to the highest-quality ranges. To examine this hypothesis, we studied aggression and dominance relationships among Kanyawara females during a 10-yr period that included the immigration of 5 females into the community. We tested 2 predictions: 1) that female-female aggression
should intensify when immigrants enter the community because this is when core area access is determined and 2) that the quality of core areas should reflect relative female dominance relationships. In support of the first prediction, female-female aggression increased 4-fold when new immigrants were in the community, with rates peaking when there were multiple immigrants. This pattern was due primarily to
aggression by resident mothers toward immigrants and featured coalitionary aggression, a rare behavior among female chimpanzees. In support of the second prediction, females occupying core areas high in foraging quality ranked high overall and higher than expected for their ages, whereas females occupying low-quality core areas were lower-ranking and ranked lower than expected for their ages. Together, the data indicate that though female aggression does not regularly occur in
chimpanzees, contest competition continues to play an important role in determining long-term access to resources, an important correlate of reproductive success.
Citable link to this pagehttp://nrs.harvard.edu/urn-3:HUL.InstRepos:3716619
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