1996 Fiscal Year Final Research Report Summary

Life-hisory of senile Primates and its Sociobiology

Research Project

Project/Area Number	07640952
Research Category	Grant-in-Aid for Scientific Research (C)
Allocation Type	Single-year Grants
Section	一般
Research Field	人類学(含生理人類学)
Research Institution	KYOTO UNIVERSITY
Principal Investigator	SUGIYAMA Yukimaru KYOTO UNIVERSITY,Primate Research Institute, Section of Ecology, Professor, 霊長類研究所, 教授 (20025349)
Co-Investigator(Kenkyū-buntansha)	OHSAWA Hideyuki KYOTO UNIVERSITY,Primate Research Institute, Section of Social Behavior, Associa, 霊長類研究所, 助教授 (60027498)
Project Period (FY)	1995 – 1996
Keywords	Japanese macaque (Macaca fuscata) / Chimpanzee (Pan troglodytes verus) / Senile / Activity / Sociality / Reproductive parameter
Research Abstract	1.Social behavior and reproductive parameters of free-ranging senile Japanese macaques (Macaca fuscata at Takasakiyama) and West African chimpanzees (Pan troglodytes verus at Bossou, Guinea) have been studied. Activity of senile female macaque goes down but her sociality doesn't decrease because daughters and other younger females aproach to groom her. Reproductive rate gradually decreases but lasts util 22-3 years old and suddenly drops. Females still survive another 4 or 5 years. Activity of senile female chimpanzee of more than 40 years old doesn't look change but she travels mostly with her family group and rarely does alone. Reproductive rate slightly decreases after 35 years old but lasts over 40.

(2 results)