General gregariousness and specific social preferences among wild chimpanzees

Citation
Jw. Pepper et al., General gregariousness and specific social preferences among wild chimpanzees, INT J PRIM, 20(5), 1999, pp. 613-632
Citations number
45
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Animal Sciences
Journal title
INTERNATIONAL JOURNAL OF PRIMATOLOGY
ISSN journal
0164-0291 → ACNP
Volume
20
Issue
5
Year of publication
1999
Pages
613 - 632
Database
ISI
SICI code
0164-0291(199910)20:5<613:GGASSP>2.0.ZU;2-Z
Abstract
Wild chimpanzees form temporary parties that vary in size and composition. Previous studies have revealed considerable intraspecific variation in part y compositions. We examined patterns of association among age, sex, and rep roductive classes of chimpanzees at Ngogo in the Kibale National Park, Ugan da. We employed a class-based association index and a randomization procedu re to control for confounding factors and to test for differences between c lasses. Results indicate that males associated with other males significant ly more than expected if all classes behaved equivalently, while females ge nerally associated with individuals of the same sex less than expected. To interpret these patterns we used two additional indices that separate assoc iations into two components: general gregariousness and preference for part icular classes of associates. Males and estrous females were more gregariou s than other classes, while anestrous females were less so. After controlli ng for general gregariousness, adult males as a class showed no specific pr eference for associating with each other. Anestrous females preferred each other as party members, and estrous females avoided each other. These resul ts are consistent with previous findings that adult males are more gregario us than females. They diverge from the standard picture of chimpanzee socie ty, however, by suggesting a mutual affinity among anestrous females, but n ot among adult males as a class.