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Mortality of wild and captive chimpanzees
1Department of Zoology, Australian National University, Canberra.
Folia Primatologica; International Journal of Primatology
|January 1, 1989
Summary
Chimpanzee mortality rates showed similar overall survival up to age 30 between wild and zoo populations. However, zoo chimpanzees had higher perinatal mortality, while wild chimpanzees experienced greater infant mortality.
Area of Science:
- Primate Ecology
- Zoological Studies
- Conservation Biology
Background:
- Understanding chimpanzee mortality is crucial for conservation efforts.
- Comparing wild and captive populations provides insights into environmental impacts on lifespan.
Purpose of the Study:
- To compare mortality patterns of chimpanzees in the wild (Gombe National Park) versus captivity (Taronga Zoo, Sydney and Melbourne Zoo).
- To identify differences in mortality distribution across age groups between wild and captive chimpanzees.
Main Methods:
- Utilized standard cohort life table techniques to analyze mortality data.
- Employed a logrank test to compare overall mortality probabilities up to age 30.
Main Results:
- No significant difference in overall mortality probabilities was found between wild and captive chimpanzees up to age 30.
- Zoo chimpanzees exhibited higher perinatal mortality, whereas wild chimpanzees showed higher post-perinatal and infant mortality.
- Survivorship was better in older captive chimpanzees (over 27 years) compared to their wild counterparts.
Conclusions:
- The sheltered zoo environment, including veterinary care, likely contributes to improved survival in zoo infants and older adults.
- Higher perinatal mortality in zoo infants may indicate increased inbreeding within captive populations.
- Despite overall similar mortality, distinct patterns in mortality distribution highlight the influence of environment and genetics on chimpanzee survival.