International Journal of Primatology

, Volume 22, Issue 6, pp 947–959 | Cite as

What Factors Affect the Size of Chimpanzee Parties in the Kalinzu Forest, Uganda? Examination of Fruit Abundance and Number of Estrous Females

Abstract

We examined factors affecting the size of chimpanzee parties in the Kalinzu Forest, Uganda. We found that the number of individuals in a party increased with observation time. Therefore, we employed two methods to reduce this bias: (1) we evaluated party size via the mean number of individuals observed in each 1-h period during the observation of a party (1-h party size), and (2) we used the number of all individuals observed in a party (1-day party size) and performed an analysis of covariance, with observation time of the party as the covariant. We examined factors that might affect party size: fruit abundance, fruit distribution, and number of estrous females. There was no relationship between party size and fruit abundance or distribution. Conversely, the number of males has a significant positive correlation with the number of estrous females, though there is no correlation with the number of anestrous females. These results suggest that males tended to join parties with more females in estrous, irrespective of differences in fruit availability.

Pan troglodytes party size fruit abundance estrous female Kalinzu Forest 

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REFERENCES

  1. Altman, J. (1974). Observational study of behavior sampling methods. Behaviour 49: 227-267.Google Scholar
  2. Boesch, C. (1991). The effects of leopard predation on grouping patterns in forest chimpanzees. Behaviour 117: 220-242.Google Scholar
  3. Boesch, C. (1996). Social grouping in Taï chimpanzees. In McGrew, W., Marchant, L., and Nishida, T. (eds.), Great Ape Societies, Cambridge University Press, Cambridge, pp. 101-113.Google Scholar
  4. Chapman, C. A., White, F. J., and Wrangham, R. W. (1994a). Party size in chimpanzees and bonobos. In Wrangham, R. W., McGrew, W. C., deWaal, F. B. M., and Heltne, P. G. (eds.), Chimpanzee Cultures, Harvard University Press, Cambridge, pp. 41-57.Google Scholar
  5. Chapman, C. A., Wrangham, R., and Chapman, L. J. (1994b). Indices of habitat-wide fruit abundance in tropical forests. Biotropica 26: 160-171.Google Scholar
  6. Chapman, C. A., Wrangham, R. W., and Chapman, L. J. (1995). Ecological constraints of group size: An analysis of spider monkey and chimpanzee subgroups. Behav. Ecol. Sociobiol. 36: 59-70.Google Scholar
  7. Doran, D. (1997). Influence of seasonality on activity patterns, feeding behavior, ranging, and grouping patterns in Taï chimpanzees. Int. J. Primatol. 18: 183-206.Google Scholar
  8. Furuichi, T., Hashimoto, C., and Tashiro, Y. (2001). Extended application of a marked-nest census method to examine seasonal changes in habitat use by chimpanzees. Int. J. Primatol. 22: 913-928.Google Scholar
  9. Goodall, J. (1986). The Chimpanzees of Gombe/Patterns of Behavior, Harvard University Press, Cambridge.Google Scholar
  10. Hashimoto, C. (1995). Population census of the chimpanzees in the Kalinzu Forest, Uganda: Comparison between methods with nest counts. Primates 36: 477-488.Google Scholar
  11. Hashimoto, C. (1999). Observations on the injuries sustained by wild chimpanzees in the Kalinzu Forest, Uganda. Primate Res. 15: 187-192 (in Japanese with an English abstract).Google Scholar
  12. Hashimoto, C., Furuichi, T., and Tashiro, Y. (2000). Ant dipping and meat eating by wild chimpanzees in the Kalinzu Forest, Uganda. Primates 41: 103-108.Google Scholar
  13. Hashimoto, C., Furuichi, T., Tashiro, Y., and Kimura, D. (1999). Vegetation of the Kalinzu Forest, Uganda: Ordination of forest types using principal component analysis. Afr. Study Monogr. 20: 229-239.Google Scholar
  14. Howard, P. C. (1991). Nature Conservation in Uganda's Tropical Forest Reserves, IUCN, Gland, Switzerland and Cambridge.Google Scholar
  15. Matsumoto-Oda, A. (1999). Mahale chimpanzees: Grouping patterns and cycling females. Am. J. Primatol. 47: 197-207.Google Scholar
  16. Matsumoto-Oda, A., Hosaka, K., Huffman, M. A., and Kawanaka, K. (1998). Factors affecting party size in chimpanzees of the Mahale Mountains. Int. J. Primatol. 19: 999-1011.Google Scholar
  17. Riss, D. C., and Busse, C. (1977). Fifty day observation of a free-ranging adult male chimpanzee. Folia Primatol. 28: 283-297.Google Scholar
  18. 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
  19. Sokal, R. R. and Rohlf, F. J. (1995). Biometry: The principles and Practice of Statistics in Biological Research, 3rd Edition. Freeman, New York.Google Scholar
  20. Stanford, C. B., Wallis, J., Mpongo, E., and Goodall, J. (1994). Hunting decisions in wild chimpanzees. Behaviour 131: 1-18.Google Scholar
  21. Tutin, C. E. G., McGrew, W. C., and Baldwin, P. J. (1983). Social organization of savanna-dwelling chimpanzees, Pan troglodytes verus, at Mt. Assirik, Senegal. Primates 24: 154-173.Google Scholar
  22. Tutin, C. E. G., Rebecca, M. H., White, L. J. T., and Harrison, M. J. S. (1997). The primate community of the Lope Reserve, Gabon: Diets, responses to fruit scarcity, and effects on biomass. Am. J. Primatol. 42: 1-24.Google Scholar
  23. Wrangham, R. W. (1977). Feeding behaviour of chimpanzees in Gombe National Park, Tanzania. In Clutton-Brock, T. H. (ed.), Primate Ecology: Studies of Feeding and Ranging Behaviour in Lemurs, Monkeys and Apes, Academic Press, London, New York, and San Francisco, pp. 503-538.Google Scholar
  24. Wrangham, R. W. (2000). Why are male chimpanzees more gregarious than mothers? A scramble competition hypothesis. In Kappeler P. M. (ed.), Primate Males: Causes and Consequences of Variation in Group Composition, Cambridge University Press, Cambridge, pp. 248-258.Google Scholar
  25. Wrangham, R.W., Chapman, C. A., Clark-Arcadi, A. P., and Isabirye-Basuta, G. (1996). Social ecology of Kanyawara chimpanzees: Implications for understanding the costs of great ape groups. In McGrew, E. W., Marchant, L. F., Nishida, T. (eds.), Great Ape Societies, Cambridge University Press, pp. 45-57.Google Scholar
  26. Wrangham, R. W., Clark, A. P., and Isabirye-Basuta, G. (1992). Female social relationships and social organization of Kibale Forest chimpanzees. In Nishida, T., McGrew, W. C., Marler, P., Pickford, M., and deWaal, F. B. M. (eds.), Topics in Primatology Vol. 1 Human Origins, University of Tokyo Press, Tokyo, pp. 81-98.Google Scholar
  27. Wrangham, R. W., Conklin, N. L., Etot, G., Obua, J., Hunt, K. D., Hauser, M. D., and Clark, A. P. (1993). The value of figs to chimpanzees. Int. J. Primatol. 14: 243-256.Google Scholar
  28. Yamakoshi, G. (1998). Dietary responses to fruit scarcity of wild chimpanzees at Bossou, Guinea: Possible implications for ecological importance of tool use. Am. J. Phys. Anthropol. 106: 283-295.Google Scholar

Copyright information

© Plenum Publishing Corporation 2001

Authors and Affiliations

  • Chie Hashimoto
    • 1
  • Takeshi Furuichi
    • 2
  • Yasuko Tashiro
    • 1
  1. 1.Primate Research InstituteKyoto UniversityInuyama, AichiJapan
  2. 2.Laboratory of BiologyMeiji-Gakuin University, tTotsuka, YokohamaKanagawaJapan

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