Comparative survival analyses among captive chimpanzees ( Pan troglodytes ) in America and Japan

PeerJ

article

Judy Che-Castaldo¹  Kristin Havercamp²  Koshiro Watanuki²  Tetsuro Matsuzawa³  Satoshi Hirata²  Stephen R. Ross⁶ 

[1] Alexander Center for Applied Population Biology, Conservation & Science Department, Lincoln Park Zoo;Wildlife Research Center, Kyoto University;Chubu Gakuin University;Division of the Humanities and Social Science, California Institute of Technology;Kumamoto Sanctuary, Kyoto University;Lester E. Fisher Center for the Study and Conservation of Apes, Lincoln Park Zoo

关键词: Chimpanzee;    Survival analyses;    Life table;    Longevity;    Mortality;    Life history;    America;    Japan;    Captivity;   

DOI  :  10.7717/peerj.11913

学科分类：社会科学、人文和艺术（综合）

来源: Inra

【 摘 要 】

Detailed, long-term datasets on the life histories of long-lived species such as great apes are necessary to understand their survival patterns but are relatively rare. Such information requires prolonged and consistent record-keeping over many generations, so for chimpanzees (Pan troglodytes), this equates to many decades of input. As life history variables can be altered by differences in environmental influences (whether natural or artificial), there is substantial value to being able to compare across populations. Here, we present the first comparative analysis of life history data for two ex situ chimpanzee populations residing in North America (1975–2020; n = 730) and Japan (1980–2020; n = 660). Overall, survival patterns were similar between regions, and the median life expectancy from birth is estimated at 35.7 (95% CI = [32.4–40.0]) years for females and 30.1 (27.3–34.3) years for males across both populations. Females who survive to their first birthday are estimated to survive 42.4 (40.0–46.3) years and males 35.5 (32.6–38.0) years. We found that birth type (wild-born or captive-born) did not influence survival patterns in either population, but there were differential effects of sex on longevity. In the America population, males had higher mortality rates than females, whereas in the Japan population we found no differences between the sexes. First year mortality did not differ between populations for males (18–20%), but for females it was lower in America (15%) compared to Japan (25%). Survival patterns of chimpanzees in the present study will be useful for future investigation into potential causes of regional differences and cross-species comparisons.

【 授权许可】

CC BY