Social structure and dynamics of wild chimpanzees at Bossou, Guinea

@article{Sugiyama2006SocialSA,
  title={Social structure and dynamics of wild chimpanzees at Bossou, Guinea},
  author={Yukimaru Sugiyama and Jeremy Koman},
  journal={Primates},
  year={2006},
  volume={20},
  pages={323-339}
}
A small population of wild chimpanzees was studied at Bossou, Guinea, for six months from November 1976 to May 1977. All the chimpanzees except dependent infants were identified without artificial feeding and were observed from within 20 m almost every day. The population size of 21 chimpanzees was little changed from 1967. Although the sex ratio (male/female) of immatures (infants, juveniles, and adolescents) was 0.833 in January 1977, the adult sex ratio was 0.429. More than half of the males… 
Observations on the population dynamics and behavior of wild chimpanzees at Bossou, Guinea, in 1979–1980
TLDR
It is clear that hunting and meateating are not habitual but accidental among the chimpanzees of Bossou and the high social cohesion of this group and related behavior patterns changed little between the studies in spite of the disappearance of dominant and other males.
Socioecological factors of male chimpanzee migration at Bossou, Guinea
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More adult males than females disappeared from Bossou, Guinea, west Africa, and it is highly likely that some of these males emigrated rather than succumbed to sickness and death.
Demographic parameters and life history of chimpanzees at Bossou, Guinea.
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  • Biology, Medicine
    American journal of physical anthropology
  • 2004
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The rate of disappearance from Bossou dramatically increases during the adolescent stage, and most young chimpanzees disappear before or around maturation, and the lifetime reproductive success of Bossou chimpanzees is estimated to be highest among long-term study sites.
Population dynamics of wild chimpanzees at Bossou, Guinea, between 1976 and 1983
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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 and the increase in number by births was offset by the disappearance (perhaps emigration) of adolescent chimpanzees.
Grooming interactions among adult chimpanzees at Bossou, Guinea, with special reference to social structure
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    International Journal of Primatology
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Characteristics of same-sex affinitive interactions, especially between Bossou chimpanzee females, clearly differ from those of East African chimpanzees and are more like those recorded for female-related groups of Japanese macaques (Macaca fuscata).
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Experimental study on sexual behavior between mother and son in Japanese monkeys (Macaca fuscata)
A mother, her adult son, four adult males and six adult females from a free-ranging group at Katsuyama were paired in a cage in the sexual seasons from 1976 to 1980. The paired subjects were
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