International Journal of Primatology

, Volume 20, Issue 5, pp 613–632 | Cite as

General Gregariousness and Specific Social Preferences among Wild Chimpanzees

  • John W. Pepper
  • John C. Mitani
  • David P. Watts

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.

Pan troglodytes animal sociality associations randomization tests 

REFERENCES

  1. Bejder, L., Fletcher, D., and Brager, S. (1998). A method for testing association patterns in social animals. Anim. Behav. 56: 719–725.Google Scholar
  2. 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.Google Scholar
  3. Butynski, T. (1990). Comparative ecology of blue monkeys (Cercopithecus mitis) in high-and low-density subpopulations. Ecol. Monogr. 60: 1–26.Google Scholar
  4. Cairns, S., and Schwager, S. (1987). A comparison of association indices. Anim. Behav. 35: 1454–1469.Google Scholar
  5. Doran, D. (1997). Influence of seasonality on activity patterns, feeding behavior, ranging, and grouping patterns in Tai chimpanzees. Int. J. Primatol. 18: 183–206.Google Scholar
  6. Ficken, M., Witken, S., and Weise, C. (1981). Associations among members of a black-capped chickadee flock. Behav. Ecol. Sociobiol. 8: 245–249.Google Scholar
  7. Furuichi, T., and Ihobe, H. (1994). Variation in male relationships in bonobos and chimpanzees. Behaviour 130: 211–228.Google Scholar
  8. Ghiglieri, M. (1984). The Chimpanzees of the Kibale Forest, Columbia University Press, New York.Google Scholar
  9. Goldberg, T., and Wrangham, R. (1997). Genetic correlates of social behaviour in wild chimpanzees: evidence from mitochondrial DNA. Anim. Behav. 54: 559–570.Google Scholar
  10. Goodall, J. (1965). Chimpanzees of the Gombe Stream Reserve. In DeVore, I. (ed.), Primate Behavior. Holt, Rinehart, Winston, New York, pp. 425–473.Google Scholar
  11. Goodall, J. (1973). The behaviour of the chimpanzee in their natural habitat. Am. J. Psychiatry 130: 1–12.Google Scholar
  12. Goodall, J. (1986). The Chimpanzees of Gombe, Belknap Press, Cambridge, Massachusetts.Google Scholar
  13. Grassia, A. (1978). A technique in the study of aggregative behaviour of sheep. Appl. Anim. Ethol. 4: 369–377.Google Scholar
  14. 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.Google Scholar
  15. 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.Google Scholar
  16. Holm, S. (1979). A simple sequentially rejective multiple test procedure. Scand. J. Statist. 6: 65–70.Google Scholar
  17. Jarman, P. (1974). The social organisation of antelope in relation to their ecology. Behaviour 48: 215–267.Google Scholar
  18. Kortlandt, A. (1962). Chimpanzees in the wild. Sci. Am. 206: 128–138.Google Scholar
  19. Manly, B. (1997). Randomisation, Bootstrap and Monte Carlo Methods in Biology, 2nd ed., Chapman and Hall, London.Google Scholar
  20. Matsumoto-Oda, A. (1999). Mahale chimpanzees: grouping patterns and cycling females. Am. J. Primatol. 47: 197–207.Google Scholar
  21. Nishida, T. (1968). The social group of wild chimpanzees in the Mahale Mountains. Primates 9: 167–224.Google Scholar
  22. 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.Google Scholar
  23. 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.Google Scholar
  24. 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.Google Scholar
  25. Parker, P., Waite, T., and Decker, M. (1995). Kinship and association in communally roosting black vultures. Anim. Behav. 49: 395–401.Google Scholar
  26. Pepper, J. (1996). The behavioral ecology of the Glossy Black-Cockatoo Calyptoryhnchus lathami halmaturinus, Ph.D. thesis, University of Michigan, Ann Arbor.Google Scholar
  27. Pusey, A. (1983). Mother-offspring relationships in chimpanzees after weaning. Anim. Behav. 31: 363–377.Google Scholar
  28. 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.Google Scholar
  29. Riss, D., and Busse, C. (1977). Fifty-day observation of a free-ranging adult male chimpanzee. Folia Primatol. 28: 283–297.Google Scholar
  30. 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.Google Scholar
  31. Rowell, T., and Rowell, C. (1993). The social organisation of feral Ovis aries ram groups in the pre-rut period. Ethology 95: 213–232.Google Scholar
  32. Sakura, O. (1994). Factors affecting party size and composition of chimpanzees (Pan troglodytes verus) at Bossou, Guinea. Int. J. Primatol. 15: 167–183.Google Scholar
  33. 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.Google Scholar
  34. Stanford, C., Wallis, J., Mpongo, E., and Goodall, J. (1994). Hunting decisions in wild chimpanzees. Behaviour 131: 1–18.Google Scholar
  35. Sterck, E., Watts, D., and van Schaik, C. (1997). The evolution of female social relationships in nonhuman primates. Behav. Ecol. Sociobiol. 41: 291–309.Google Scholar
  36. Struhsaker, T. (1997). Ecology of an African Rain Forest, University Press of Florida, Gainesville, Florida.Google Scholar
  37. Sugiyama, Y. (1968). Social organization of chimpanzees in the Budongo Forest, Uganda. Primates 9: 225–258.Google Scholar
  38. Sugiyama, Y. (1988). Grooming interactions among adult chimpanzees at Bossou, Guinea, with special reference to social structure. Int. J. Primatol. 9: 393–407.Google Scholar
  39. Sugiyama, Y., and Koman, J. (1979). Social structure and dynamics of wild chimpanzees at Bossou, Guinea. Primates 20: 323–339.Google Scholar
  40. 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.Google Scholar
  41. 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.Google Scholar
  42. Underwood, R. (1981). Companion preference in an eland herd. Afr. J. Ecol. 19: 341–354.Google Scholar
  43. van Hooff, J., and van Schaik, C. (1994). Male bonds: affiliative relationships among nonhuman primate males. Behaviour 130: 309–337.Google Scholar
  44. Wilkinson, G. (1985). The social organization of the common vampire bat. I. Pattern and cause of association. Anim. Behav. 17: 111–121.Google Scholar
  45. Wrangham, R. (1980). An ecological model of female-bonded primate groups. Behaviour 75: 262–300.Google Scholar
  46. 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.Google Scholar
  47. 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.Google Scholar

Copyright information

© Plenum Publishing Corporation 1999

Authors and Affiliations

  • John W. Pepper
    • 1
  • John C. Mitani
    • 2
  • David P. Watts
    • 3
  1. 1.Museum of ZoologyUniversity of MichiganAnn Arbor
  2. 2.Department of AnthropologyUniversity of MichiganAnn Arbor
  3. 3.Department of AnthropologyYale UniversityNew Haven

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