![]() birth rates, or mortality rates of the Itombwe gorillas to predict what the. The Kanyawara data thus suggest an important downward revision in adult mortality rates for wild chimpanzees, but they do not challenge the existence of an important difference in adult mortality between humans and chimpanzees.įoragers Life history evolution Life table Wild chimpanzees.Ĭopyright © 2013 Elsevier Ltd. The population of eastern chimpanzees in the Itombwe Reserve was estimated. The comparable adult mortality rate from a range of human foraging societies is ∼2%. The virus is even more deadly for other great apes as it is for humans, with mortality rates approximately 95 for gorillas and 77 for chimpanzees (Pan troglodytes). Communications Biology - Chimpanzees are known to suffer from malaria parasitism. Life table data from Kanyawara indicate a mean mortality rate of 3.9% per year over the ages of 10-35, substantially less than the equivalent figure of 6.8% from a sample of other long-term chimpanzee study sites. This rate suggests that many chimpanzee mothers experience loss of infants, perhaps even multiple times within their reproductive lifespans. 2018), with first-year infant mortality estimated at 20 across populations (Hill et al. Kanyawara chimpanzees in this sample had a life expectancy at birth of 19 years, and individuals living to age 14 could expect to live for another 24 years. Infant mortality rates in chimpanzees are extraordinarily high for apes (Hill et al. It is possible that much of the mortality caused by leopards can be attributed to individuals that have specialised. However, overall mortality rates were significantly lower than those reported from the long-term study sites of Gombe, Taï and Mahale. Leopards prey on chimpanzees in some areas. Sex differences in mortality at Kanyawara appeared similar to those reported from other sites. This community has shown modest growth over the past 25 years, avoiding some of the worst impacts of human contact. ![]() ![]() Here we present a life table for chimpanzees living in the Kanyawara community of Kibale National Park, comprising 1129 individual risk years and 56 deaths. Published mortality data, however, come primarily from chimpanzee populations that have recently suffered dramatic, human-induced declines, and exhibit rates of reproduction well below replacement. In this paper, I address the impact of hunting on the red colobus population at Ngogo. Demographic data from wild chimpanzees are of considerable interest for understanding the evolution of the human life history. dation by chimpanzees may be contributing to this decline. ![]()
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