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Title: Comparative survival analyses among captive chimpanzees (Pan troglodytes) in America and Japan
Authors: Che-Castaldo, Judy
Havercamp, Kristin
Watanuki, Koshiro
Matsuzawa, Tetsuro
Hirata, Satoshi
Ross, Stephen R.
Author's alias: 綿貫, 宏史朗
平田, 聡
Keywords: Chimpanzee
Survival analyses
Life table
Longevity
Mortality
Life history
America
Japan
Captivity
Issue Date: 12-Aug-2021
Publisher: PeerJ
Journal title: PeerJ
Volume: 9
Thesis number: e11913
Abstract: 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.
Rights: © 2021 Che-Castaldo et al.
This is an open access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, reproduction and adaptation in any medium and for any purpose provided that it is properly attributed. For attribution, the original author(s), title, publication source (PeerJ) and either DOI or URL of the article must be cited.
URI: http://hdl.handle.net/2433/275689
DOI(Published Version): 10.7717/peerj.11913
PubMed ID: 34447626
Appears in Collections:Journal Articles

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