Abstract
Wild chimpanzees form temporary parties that vary in size and composition. Previous studies have revealed considerable intraspecific variation in party compositions. We examined patterns of association among age, sex, and reproductive classes of chimpanzees at Ngogo in the Kibale National Park, Uganda. We employed a class-based association index and a randomization procedure to control for confounding factors and to test for differences between classes. Results indicate that males associated with other males significantly more than expected if all classes behaved equivalently, while females generally associated with individuals of the same sex less than expected. To interpret these patterns we used two additional indices that separate associations into two components: general gregariousness and preference for particular classes of associates. Males and estrous females were more gregarious than other classes, while anestrous females were less so. After controlling for general gregariousness, adult males as a class showed no specific preference for associating with each other. Anestrous females preferred each other as party members, and estrous females avoided each other. These results are consistent with previous findings that adult males are more gregarious than females. They diverge from the standard picture of chimpanzee society, however, by suggesting a mutual affinity among anestrous females, but not among adult males as a class.
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REFERENCES
Bejder, L., Fletcher, D., and Brager, S. (1998). A method for testing association patterns in social animals. Anim. Behav. 56: 719–725.
Boesch, C. (1996). Social grouping in Tai chimpanzees. In McGrew, W., Marchant, L., and Nishida, T. (ed.), Great Ape Societies, Cambridge University Press, Cambridge, pp. 101–113.
Butynski, T. (1990). Comparative ecology of blue monkeys (Cercopithecus mitis) in high-and low-density subpopulations. Ecol. Monogr. 60: 1–26.
Cairns, S., and Schwager, S. (1987). A comparison of association indices. Anim. Behav. 35: 1454–1469.
Doran, D. (1997). Influence of seasonality on activity patterns, feeding behavior, ranging, and grouping patterns in Tai chimpanzees. Int. J. Primatol. 18: 183–206.
Ficken, M., Witken, S., and Weise, C. (1981). Associations among members of a black-capped chickadee flock. Behav. Ecol. Sociobiol. 8: 245–249.
Furuichi, T., and Ihobe, H. (1994). Variation in male relationships in bonobos and chimpanzees. Behaviour 130: 211–228.
Ghiglieri, M. (1984). The Chimpanzees of the Kibale Forest, Columbia University Press, New York.
Goldberg, T., and Wrangham, R. (1997). Genetic correlates of social behaviour in wild chimpanzees: evidence from mitochondrial DNA. Anim. Behav. 54: 559–570.
Goodall, J. (1965). Chimpanzees of the Gombe Stream Reserve. In DeVore, I. (ed.), Primate Behavior. Holt, Rinehart, Winston, New York, pp. 425–473.
Goodall, J. (1973). The behaviour of the chimpanzee in their natural habitat. Am. J. Psychiatry 130: 1–12.
Goodall, J. (1986). The Chimpanzees of Gombe, Belknap Press, Cambridge, Massachusetts.
Grassia, A. (1978). A technique in the study of aggregative behaviour of sheep. Appl. Anim. Ethol. 4: 369–377.
Halperin, S. (1979). Temporary association patterns in free ranging chimpanzees: an assessment of individual grouping preferences. In Hamburg, D., and McCown, E. (ed.), The Great Apes, Benjamin-Cummings, Menlo Park, California, pp. 491–499.
Holekamp, K., Cooper, S., Katona, C., Berry, N., Frank, L., and Smale, L. (1997). Patterns of association among female spotted hyenas (Crocuta crocuta). J. Mammal. 78: 55–64.
Holm, S. (1979). A simple sequentially rejective multiple test procedure. Scand. J. Statist. 6: 65–70.
Jarman, P. (1974). The social organisation of antelope in relation to their ecology. Behaviour 48: 215–267.
Kortlandt, A. (1962). Chimpanzees in the wild. Sci. Am. 206: 128–138.
Manly, B. (1997). Randomisation, Bootstrap and Monte Carlo Methods in Biology, 2nd ed., Chapman and Hall, London.
Matsumoto-Oda, A. (1999). Mahale chimpanzees: grouping patterns and cycling females. Am. J. Primatol. 47: 197–207.
Nishida, T. (1968). The social group of wild chimpanzees in the Mahale Mountains. Primates 9: 167–224.
Nishida, T. (1979). The social structure of chimpanzees of the Mahale Mountains. In Hamburg, D., and McCown, E. (eds.), The Great Apes, Benjamin Cummings, Menlo Park, California, pp. 72–121.
Nishida, T. (1990). A quarter century of research in the Mahale Mountains: an overview. In Nishida, T. (ed.), The Chimpanzees of the Mahale Mountains: Sexual and Life History Strategies, University of Tokyo Press, Tokyo, pp. 3–35.
Nishida, T., Takasaki, H., and Takahata, Y. (1990). Demography and reproductive profiles. In Nishida, T. (ed.), The Chimpanzees of the Mahale Mountains, University of Tokyo Press, Tokyo, pp. 63–97.
Parker, P., Waite, T., and Decker, M. (1995). Kinship and association in communally roosting black vultures. Anim. Behav. 49: 395–401.
Pepper, J. (1996). The behavioral ecology of the Glossy Black-Cockatoo Calyptoryhnchus lathami halmaturinus, Ph.D. thesis, University of Michigan, Ann Arbor.
Pusey, A. (1983). Mother-offspring relationships in chimpanzees after weaning. Anim. Behav. 31: 363–377.
Reynolds, V., and Reynolds, F. (1965). Chimpanzees of the Budongo Forest. In DeVore, I. (ed.), Primate Behavior, Holt, Rinehart, Winston, New York, pp. 368–424.
Riss, D., and Busse, C. (1977). Fifty-day observation of a free-ranging adult male chimpanzee. Folia Primatol. 28: 283–297.
Roberts, G., and Evans, P. (1993). A method for the detection of non-random associations among flocking birds and its application to sanderlings Calidris alba wintering in N. E. England. Behav. Ecol. Sociobiol. 32: 349–354.
Rowell, T., and Rowell, C. (1993). The social organisation of feral Ovis aries ram groups in the pre-rut period. Ethology 95: 213–232.
Sakura, O. (1994). Factors affecting party size and composition of chimpanzees (Pan troglodytes verus) at Bossou, Guinea. Int. J. Primatol. 15: 167–183.
Smolker, R., Richards, A., Connor, R., and Pepper, J. (1992). Sex differences in patterns of association among Indian Ocean bottlenose dolphins. Behaviour 123: 38–69.
Stanford, C., Wallis, J., Mpongo, E., and Goodall, J. (1994). Hunting decisions in wild chimpanzees. Behaviour 131: 1–18.
Sterck, E., Watts, D., and van Schaik, C. (1997). The evolution of female social relationships in nonhuman primates. Behav. Ecol. Sociobiol. 41: 291–309.
Struhsaker, T. (1997). Ecology of an African Rain Forest, University Press of Florida, Gainesville, Florida.
Sugiyama, Y. (1968). Social organization of chimpanzees in the Budongo Forest, Uganda. Primates 9: 225–258.
Sugiyama, Y. (1988). Grooming interactions among adult chimpanzees at Bossou, Guinea, with special reference to social structure. Int. J. Primatol. 9: 393–407.
Sugiyama, Y., and Koman, J. (1979). Social structure and dynamics of wild chimpanzees at Bossou, Guinea. Primates 20: 323–339.
Takahata, H. (1990). Social relationships among adult males. In Nishida, T. (ed.), The Chimpanzees of the Mahale Mountains, University of Tokyo Press, Tokyo, pp. 149–170.
Tutin, C., McGrew, W., and Baldwin, P. (1983). Social organization of savanna-dwelling chimpanzees, Pan troglodytes versus, at Mt. Assirik, Senegal. Primates 24: 154–173.
Underwood, R. (1981). Companion preference in an eland herd. Afr. J. Ecol. 19: 341–354.
van Hooff, J., and van Schaik, C. (1994). Male bonds: affiliative relationships among nonhuman primate males. Behaviour 130: 309–337.
Wilkinson, G. (1985). The social organization of the common vampire bat. I. Pattern and cause of association. Anim. Behav. 17: 111–121.
Wrangham, R. (1980). An ecological model of female-bonded primate groups. Behaviour 75: 262–300.
Wrangham, R., and Smuts, B. (1980). Sex differences in the behavioral ecology of chimpanzees in the Gombe National Park, Tanzania. J. Reprod. Fert. 28: 13–31.
Wrangham, R., Clark, A., and Isabiryre-Basuta, G. (1992). Female social relationships and social organization of Kibale Forest chimpanzees. In Nishida, T., McGrew, W., Marler, P., Pickford, M., and deWaal, F. (eds), Topics in Primatology. Volume 1. Human Origins, Tokyo University Press, Tokyo, pp. 81–98.
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Pepper, J.W., Mitani, J.C. & Watts, D.P. General Gregariousness and Specific Social Preferences among Wild Chimpanzees. International Journal of Primatology 20, 613–632 (1999). https://doi.org/10.1023/A:1020760616641
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DOI: https://doi.org/10.1023/A:1020760616641