Abstract
I studied the party sizes of western chimpanzees (Pan troglodytes verus)and factors assumed to affect them at Bossou, Republic of Guinea, West Africa. Party size is negatively correlated with feeding ratio, and larger parties tend to be formed in more dangerous situations (i.e. crossing roads with much traffic). When parties included estrous females, young (i.e., late juvenile and adolescent) males tended to forage with them, independently from their mothers. Lactating females with infants tended to spend more time alone, but the trend was not as apparent as it is in P. t. schweinfurthiat Gombe, Tanzania. These facts suggest that several factors, in addition to food availability, affect party formation, or fission-fusion, of chimpanzees. I also briefly discuss comparatively the pattern of party formation in P. paniscus.
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References
Alexander, R. D. (1974). The evolution of social behavior.Annu. Rev. Ecol. Syst. 5: 325–383.
Altmann, J. (1974). Observational study of behavior: sampling methods.Behaviour 49: 227–267.
Badrian, A., and Badrian, N. (1984). Social organization ofPan paniscus in the Lomako Forest, Zaire. In Sussman, R. L. (ed.),The Pygmy Chimpanzee: Evolutionary Biology and Behavior, Plenum Press, New York.
Boesch, C. (1991). The effect of leopard predation on grouping patterns in forest chimpanzees.Behaviour 117: 220–242.
Boesch, C., and Boesch, H. (1989). Hunting behavior of wild chimpanzees in the Taï National Park.Am. J. Phys. Anthropol. 78: 547–573.
Dunbar, R. I. M. (1988).Primate Social Systems, Croom Helm, London.
Dunbar, R. I. M. (1989). Social systems as optimal strategy sets: the costs and benefits of sociality. In Standen, V., and Foley, R. A. (eds.),Comparative Socioecology: The Behavioural Ecology of Humans and Other Mammals, Blackwell, Oxford, pp. 131–149.
Furuichi, T. (1987). Sexual swelling, receptivity and grouping of wild pygmy chimpanzee females at Wamba, Zaire,Primates 26: 219–237.
Fushimi, T., Sakura, O., Matsuzawa, T., Ohno, H., and Sugiyama, Y. (1991). Nut-cracking behavior of wild chimpanzees(Pan troglodytes) in Bossou, Guinea (West Africa). In Ehara, A., Kimura, T., Takenaka, O., and Iwamoto, M. (eds.),Primatology Today, Elsevier, Amsterdam, pp. 695–696.
Ghiglieri, M. P. (1984).The Chimpanzees of Kibale Forest: A Field Study of Ecology and Social Structure, Columbia University Press, New York.
Goodall, J. (1968). The behaviour of free-living chimpanzees in the Gombe Stream area.Anim. Behav. Monogr. 1: 161–311.
Goodall, J. (1986).The Chimpanzees of Gombe: Patterns of Behavior, Harvard University Press, Cambridge, MA.
Hasegawa, T. (1990). Sex differences in ranging patterns. In Nishida, T. (ed.),The Chimpanzees of the Mahale Mountains: Sexual and Life History Strategies, University of Tokyo Press, Tokyo, pp. 99–114.
Hasegawa, T., and Hiraiwa-Hasegawa, M. (1983). Opportunistic and restrictive matings among wild chimpanzees in the Mahali Mountains, Tanzania.J. Ethol. 1: 75–85.
Isabirye-Basuta, G. (1988). Food competition among individuals in a free-ranging chimpanzee community in Kibale Forest, Uganda.Behaviour 105: 135–149.
Itani, J., and Suzuki, A. (1967). The social unit of chimpanzees.Primates 8: 355–381.
Kano, T. (1982). The social group of pygmy chimpanzees (Pan paniscus).Primates 23: 171–188.
Kano, T. (1986/1992).The Last Ape: Pygmy Champanzee Behavior and Ecology, Princeton University Press, Princeton, NJ.
Kawanaka, K. (1984). Association, ranging, and the social unit in chimpanzees of the Mahali Mountains, Tanzania.Int. J. Primatol. 5: 411–434.
Kendall, M., Stuart, A., and Ord, J. K. (1983).The Advanced Theory of Statistics, Vol. 3, 4th ed, Charles Griffin, London.
Kortlandt, A. (1986). The use of stone tools by wild-living chimpanzees and earliest hominids.J. Hum. Evol. 15: 77–132.
Krebs, J. R., and Davies, N. B. (1987).An Introduction to Behavioral Ecology, 2nd ed., Blackwell, Oxford.
Kuroda, S. (1979). Grouping of the pygmy chimpanzees.Primates 20: 161–183.
Martin, P., and Bateson, P. (1990).Measuring Behaviour: An Introductory Guide, Cambridge University Press, Cambridge.
Matsuzawa, T., Sakura, O., Kimura, T., Hamada, Y. and Sugiyama, Y. (1990). Case report on the death of a wild chimpanzee (Pan troglodytes vents).Primates 31: 635–641.
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. A., and McCown, E. (eds.),Great Apes, Benjamin/Cummings, Menlo Park, CA, pp. 72–121.
Nishida, T., and Hiraiwa-Hasegawa, M. (1987). Chimpanzees and bonobos: Cooperative relationships among males. In Smuts, B. B.. Cheney, D. L., Seyfarth, R. D., Wrangham, R. W., and Struhsaker, T. T. (eds.),Primate Societies, Chicago University Press, Chicago, pp. 165–180.
Okuno, T., Haga, T., Yajima, K., Okuno., C, Hashimoto, S., and Furukawa, Y. (1976).Multivariate Analysis, Vol. 2, Nikkagiren, Tokyo (in Japanese).
Riss, D. C., and Busse, C. D. (1977). Fifty-day observations of a free-ranging adult male chimpanzee.Folia Primatol. 28: 283–297.
Rubenstein, D. I., and Wrangham, R. D. (eds.) (1986).Ecological Aspects of Social Evolution, Princeton University Press, Princeton, NJ.
Sakura, O. (1991). On the concept of “group” in primates, with special reference to fission-fusion of chimpanzees. In Ehara, A., Kimura, T., Takenaka, O., and Iwamoto, M. (eds.),Primatology Today, Elsevier, Amsterdam, pp. 247–250.
Sakura, O. (1994). What is this thing called “group” of animals? A proposal of the pluralistic terminology.Annals Jap. Assoc. Phil. Sci. (in press).
Sakura, O., and Matsuzawa, T. (1991). Flexibility of nut-cracking behavior using stone hammers and anvils of wild chimpanzees: An experimental analysis.Ethology 87: 237–248.
Sakura, O., Fushimi, T., and Sugiyama, Y. (1991). Party size of chimpanzees and food patch size: A preliminary study in Bossou, Guinea. Paper presented at the 7th meeting of Japan Primatology Society, Kawasaki Medical College, Kurashiki, Okayama.
Sugiyama, Y. (1968). Social organization of chimpanzees in the Budongo forest, Uganda.Primates 9: 225–258.
Sugiyama, Y. (1973).. The social structure of wild chimpanzees: A review of field studies. In Mitchel, R. P., and Crook, J. H. (eds.),Comparative Ecology and Behavior of Primates. Academic Press, London, pp. 375–410.
Sugiyama, Y. (1981). Observations on the population dynamics and behavior of wild chimpanzees at Bossou, Guinea, 1979-1980.Primates 22: 435–444.
Sugiyama, Y. (1984). Population dynamics of wild chimpanzees at Bossou, Guinea, between 1976-1983.Primates 25: 391–400.
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. (1989). Population dynamics of chimpanzees at Bossou, Guinea. In Heltne, P. G., and Marquardt, L. G. (eds.),Understanding Chimpanzees, Harvard University Press, Cambridge, MA, pp. 134–145.
Sugiyama, Y., and Koman, J. (1979). Social structure and dynamics of wild chimpanzees at Bossou, Guinea.Primates 20: 323–339.
Sugiyama, Y., and Koman, J. (1987). A preliminary list of chimpanzees’ alimentation at Bossou, Guinea.Primates 20: 513–524.
Terborgh, J., and Janson, C. H. (1986). The socioecology of primate groups.Annu. Rev. EcoL Syst. 17: 111–135.
Tutin, C. E. G. (1979). Mating patterns and reproductive strategies in a community of wild chimpanzees.Behav. Ecol. Sociobiol. 6: 29–38.
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.
Uehara, S. (1981). The social unit of wild chimpanzees: A reconsideration based on the diachronic data accumulated at Kasoje in the Mahale Mountains, Tanzania.J. Afr. Stud. 20: 15–32.
van Schaik, C.P. (1983). Why are diurnal primates living in groups?Behaviour 87: 120–144.
White, F. J. (1988). Party composition and dynamics inPan paniscus.Int. J. Primatol. 9: 179–193.
White, F. J. (1989). Ecological correlates of pygmy chimpanzees social structure. In Standen, V., and Foley, R. A. (eds.),Comparative Socioecology: The Behavioural Ecology of Humans and Other Mammals, Blackwell, Oxford, pp. 151–164.
White, F. J., and Wrangham, R. W. (1988). Feeding competition and patch size in the chimpanzee speciesPan paniscus andPan troglodytes.Behaviour 105: 148–164.
Wrangham, R. W. (1975).The Behavioural Ecology of Chimpanzees in Gombe National Park, Ph.D. thesis, Cambridge University, Cambridge.
Wrangham, R. W. (1977). Behaviour of feeding chimpanzees in the Gombe National Park, Tanzania. In Clutton-Brock, T. H. (ed.),Primate Ecology, Academic Press, London, pp. 503–538.
Wrangham, R. W. (1986). Ecology and social relationships in two species of chimpanzee. In Rubenstein, D. I., and Wrangham, R. D. (eds.),Ecological Aspects of Social Evolution, Princeton University Press, Princeton, NJ, pp. 452–470.
Wrangham, R. W., and Smuts, B. B. (1980). Sex differences in the behavioural ecology of chimpanzees in the Gombe National Park, Tanzania.J. Reprod. Fertil Suppl. 28: 13–31.
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Sakura, O. Factors affecting party size and composition of chimpanzees (Pan troglodytes verus) Bossou, Guinea. Int J Primatol 15, 167–183 (1994). https://doi.org/10.1007/BF02735272
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DOI: https://doi.org/10.1007/BF02735272