A preliminary report on the impact of chimpanzee hunting on mammal populations at Mahale, Tanzania

Hiroshi IHOBE and Shigeo UEHARA


The impacts by chimpanzee hunting on several species of mammal populations were examined by the data of population census on these mammal species and previous reports on chimpanzee hunting at the Mahale Mountains National Park, Tanzania. The annual kill rates (1.3 - 9.0 %) of red colobus populations by the chimpanzees were suspected to be the almost same as the population growth rate of the red colobus population. These rates were slightly higher than those of the Tai National Park, Ivory Coast, but extremely lower than those of the Gombe National Park, Tanzania. The impacts of chimpanzee hunting on other mammal populations (red-tailed monkeys, blue monkeys, blue duikers, bushbucks and warthogs), which were reported to be killed by the chimpanzees, seem to be small, because the annual kill rates of these mammals by the chimpanzees were suspected to be smaller than the population growth rates of them or the hunting frequencies on these mammals by the chimpanzees were very low.

Primate Research, 15: 163-169 (1999)

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