Primates

, Volume 40, Issue 1, pp 61–68

Socioecological factors of male chimpanzee migration at Bossou, Guinea

  • Yukimaru Sugiyama
Article

Abstract

For more than 21 years a small semi-isolated group of wild chimpanzees have been studied at Bossou, Guinea, west Africa. All individuals have been identified since the beginning of the study. Remaining rates of infants (0–3 yr) and juveniles (4–7 yr) in the group were 64–80% for both sexes, however, those of adolescents (8–11 yr) dropped drastically, particularly for males (14%). As a result, most natal males as well as females disappeared before fully maturing. Two male visitors and an immigrant were observed in the group. More adult males than females disappeared from Bossou. Group males could be excluded as the genetic father of an offspring born in the group. From these demographic trends it is highly likely that some of these males emigrated rather than succumbed to sickness and death. It seems likely that they left on their own by choice. The reason for male dispersal is hypothesized to be influenced by intra-group male-male competition and the habitat ecology and structure of Bossou. There are no competitive adjacent groups or predators to prevent males from living alone and males can sire offspring out of their natal group.

Key words

Chimpanzee Male dispersal Remaining rate Male-bond Territory defense Siring by extragroup male 

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References

  1. Baker, R. R. 1978.Evolutionary Ecology of Animal Migration. Hadder & Stoughton, London.Google Scholar
  2. Boesch, C. 1996. The emergence of cultures among wild chimpanzees.Proc. Brit. Academy, 88: 251–268.Google Scholar
  3. Gagneux, P.;Woodruff, D. S.;Boesch, C. 1997. Furtive mating in female chimpanzees.Nature, 387: 358–359.PubMedCrossRefGoogle Scholar
  4. Gauthreaux, S. A. Jr. 1978. The ecological significance of behavioural dominance. In:Perspectives in Ethology, Vol. 3,Bateson,P. P. G.;Klopfer P. H. (eds.), Plenum Press, London, pp. 17–54.Google Scholar
  5. Goodall, J. 1983. Population dynamics during a 15 year period in one community of free-living chimpanzees in the Gombe National Park, Tanzania,Z. Tierpsychol., 61: 1–60.Google Scholar
  6. Goodall, J. 1986.The Chimpanzees of Gombe: Patterns of Behavior, Belknap Press, Harvard Univ. Press, Cambridge, Massachusetts.Google Scholar
  7. Greenwood, P. J. 1980. Mating systems, philopatry, and dispersal in birds and mammals.Anim. Behav., 28: 1140–1162.CrossRefGoogle Scholar
  8. Hiraiwa-Hasegawa, M.;Hasegawa, T.;Nishida, T. 1984. Demographic study of a large-sized unit-group of chimpanzees in the Mahale Mountains, Tanzania: a preliminary report.Primates, 25: 401–413.CrossRefGoogle Scholar
  9. Nishida, T.;Hiraiwa-Hasegawa, M. 1985. Responses to a stranger mother-son pair in the wild chimpanzee: a case report. Primates, 26: 1–13.CrossRefGoogle Scholar
  10. Nishida, T.;Hiraiwa-Hasegawa, M.;Hasegawa, T. 1985. Group extinction and female transfer in wild chimpanzees in the Mahele National Park, Tanzania.Z. Tierpsychol., 67: 284–301.Google Scholar
  11. Nishida, T.;Takasaki, H.;Takahata, Y. 1990. Demography and reproductive profiles. In:The Chimpanzees of the Mahale Mountains,Nishida,T. (ed.), Univ. of Tokyo Press, Tokyo, pp. 63–97.Google Scholar
  12. Normile, D. 1998. Habitat seen playing larger role in shaping behavior.Science, 276: 1454–1455.CrossRefGoogle Scholar
  13. Robbins, M. M. 1995. A demographic analysis of male life history and social structure of mountain gorillas.Behaviour, 132: 21–47.Google Scholar
  14. Sugiyama, Y. 1994. Age-specific birth rate and lifetime reproductive success of chimpanzees at Bousou, Guinea,Amer. J. Primatol., 32: 311–318.CrossRefGoogle Scholar
  15. Sugiyama, Y.;Kawamoto, S.;Takenaka, O.;Kumazaki, K.;Miwa, N. 1993. Paternity discrimination and inter-group relationships of chimpanzees at Bossou,Primates 34: 545–552.CrossRefGoogle Scholar
  16. Sugiyama, Y.;Koman, J. 1979. Social structure and dynamics of wild chimpanzees at Bossou, Guinea.Primates, 20: 323–339.CrossRefGoogle Scholar
  17. Takahata, H.;Takahata, Y. 1989. Inter-unit group transfer of an immature male common chimpanzee and its social interactions in non-natal group.Afr. Study Monogr., 9: 209–220.Google Scholar
  18. Uehara, S.;Hiraiwa-Hasegawa, M.;Hosaka, K.;Hamai, M. 1994. The fate of defeated alpha male chimpanzees in relation to their social networks.Primates, 35: 49–55.CrossRefGoogle Scholar
  19. Wrangham, R. W. 1980. An ecological model of female-bonded primate groups.Behaviour, 75: 262–299.Google Scholar
  20. Yamagiwa, J. 1987. Male life history and the social structure of wild mountain gorillas (Gorilla gorilla beringei). In:Evolution and Coadaptation in Biotic Communities,Kawano,S.;Connell,J. H.;Hidaka,T. (eds.), Univ. of Tokyo Press, Tokyo, pp. 31–51.Google Scholar

Copyright information

© Japan Monkey Centre 1999

Authors and Affiliations

  • Yukimaru Sugiyama
    • 1
  1. 1.Primate Research InstituteKyoto UniversityInuyama, AichiJapan

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