, Volume 25, Issue 4, pp 391–400

Population dynamics of wild chimpanzees at Bossou, Guinea, between 1976 and 1983


  • Yukimaru Sugiyama
    • Primate Research InstituteKyoto University

DOI: 10.1007/BF02381662

Cite this article as:
Sugiyama, Y. Primates (1984) 25: 391. doi:10.1007/BF02381662


The population dynamics of a small group of wild chimpanzees at Bossou, Guinea, were studied during a 6.5-year period between 1976 and 1983. The natality rate (0.23 births/female/year) was higher and the interbirth interval (4.3–4.4 years/female) was shorter than those of chimpanzees at East African study sites (the Gombe and Mahale National Parks). The infant mortality for the first 3 years (0.06–0.18/year) was lower than those in East Africa. However, the population had remained almost stable since 1967 (growth rate: 0.985/year). The increase in number by births was offset by the disappearance (perhaps emigration) of adolescent chimpanzees. Adult males immigrated and disappeared (perhaps emigrated) but adult females rarely did.

Download to read the full article text

Copyright information

© Japan Monkey Centre 1984