Y. Sugiyama

Publications95
h-index37
Citations3,603
Highly Influential Citations166
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CHARTING CULTURAL VARIATION IN CHIMPANZEES
Cultural variation among chimpanzee communities or unit-groups at nine long-term study sites was charted through a systematic, collaborative procedure in which the directors of the sites first agreed…
Aging and Fertility Patterns in Wild Chimpanzees Provide Insights into the Evolution of Menopause
TLDR
Examination of fertility and mortality patterns in six free-living chimpanzee populations finds no evidence that menopause is a typical characteristic of chimpanzee life histories, in contrast to recent claims.
The Flora of Bossou: Its Utilization by Chimpanzees and Humans
Altogether 664 plant species from 392 genera have been identified and listed as the flora of Bossou, in the south-eastern corner of the Republic of Guinea. Previously, Bossou must have been covered…
Age‐specific birth rate and lifetime reproductive success of chimpanzees at Bossou, Guinea
  • Y. Sugiyama
  • Biology, Medicine
    American journal of primatology
  • 1994
TLDR
Preliminary calculations of the age‐specific birth rate for wild female chimpanzees were based on demographic records from a long‐term study at Bossou, Republic of Guinea, and found that the lifetime reproductive success must be less than the minimum reproductive success required for continued survival of the population.
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.
Demographic parameters and life history of chimpanzees at Bossou, Guinea.
  • Y. Sugiyama
  • Biology, Medicine
    American journal of physical anthropology
  • 1 June 2004
TLDR
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.
Behavioural Diversity in Chimpanzees and Bonobos: Multivariate and phylogenetic approaches to understanding chimpanzee and bonobo behavioral diversity
TLDR
To date, no study has quantitatively examined the combined influence of ecology, habitat, demography, and phylogeny on behavior.
Carrying of dead infants by Japanese macaque (Macaca fuscata) mothers
TLDR
The quantitative and demographic features of infant-corpse-carrying behavior in Japanese macaques at Takasakiyama, southern Japan, have been studied over 24 years and some females persist in exhibiting behaviors performed towards live infants but the exact reasons for this are unclear at present.
Social structure and dynamics of wild chimpanzees at Bossou, Guinea
TLDR
A small population of wild chimpanzees was studied at Bossou, Guinea, for six months from November 1976 to May 1977, and mothers who had infants aged about 1 year or more showed swelling of their sexual skin and were confirmed to mate with males.
The brush-stick of chimpanzees found in south-west Cameroon and their cultural characteristics
AbstractThe characteristics of the tool-behavior of chimpanzees were studied at the Campo Animal Reserve, in the south-west corner of the Republic of Cameroon between December 1984 and January 1985.…
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