Abstract
Juvenile mortality is an important problem in the development of captive populations. I compiled data from published literature on abortion, premature mortality, stillbirth, and death of unweaned young. Cumulative mortality incidences (CMI) during the first month in captive populations (CP) of Cercopithecoidea range between 13 and 51%, and CMI in the first year between 28 and 56%. Mortality rate during the first year ranges between <4 and 48% in free- ranging populations (FRP) and between 10 and 60% in wild populations (WP). Much of the juvenile mortality in CP appears to occur in the first month, whereas in FRP and WP mortality is more scattered throughout the juvenile period. High mortality rates occur in both CP and WP of nonhuman Hominoidea. Mortality rate during the first month in CP is between 12 and 36% for the Hylobatidae and between 18 and 31% for the Pongidae. If the entire juvenile period is considered, gorilla CP and WP have comparable CMI, while CMI is higher in WP than CP for chimpanzees. Most of the juvenile mortality in CP of chimpanzees occurs before the age of 1 year. Trauma, including infanticide and maternal inadequacy, seems to be a more important factor in infant mortality of Cercopithecoidea than infectious disease is. Relatively frequent reports of congenital, hereditary, and/or genetically determined malformations in the Cercopithecoidea may be related to the long use of animals in this group for laboratory purposes. Infectious disease is the most important cause of nonhuman hominoid juvenile mortality, followed by trauma and maternal disorders, particularly related aberrant maternal behavior. Cercopithecoid juvenile mortality risk factors most frequently mentioned in the literature are sex of the infant and rank of the mother: dominant females produce more female offspring, and juvenile males suffer higher mortality than females do. The female skewed sex ratio at birth in gorillas and chimpanzees could be explained by the local resource competition theory. Higher male mortality rates occur in nonhuman Hominoidea, except in two Hylobatesspp. and Pan paniscus,which have higher female mortality. Parity and rearing history of the mother are very important risk factors in nonhuman hominoid infant mortality.
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Debyser, I.W.J. Catarrhine juvenile mortality in captivity, under seminatural conditions, and in the wild. International Journal of Primatology 16, 935–969 (1995). https://doi.org/10.1007/BF02696111
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DOI: https://doi.org/10.1007/BF02696111