![]() Sex, Evolution and Behavior (Duxbury, Massachusetts, 1978). in Primate Conservation (eds Prince Rainier III & Bourne, G. The Langurs of Abu (Harvard University Press, Massachusetts, 1977). Comparative Anatomy and Taxonomy 8, Cynopithecinae (Edinburgh University Press, 1970). DeVore, I.) (Holt, Rinehart & Winston, New York, 1965). Social Organisation of Hamadryas Baboons (University of Chicago Press, 1968). Primates of South Asia (Harvard University Press, Massachusetts, 1977). Developments in Field and Laboratory Research Vol. The New World Primates (Princeton University Press, New Jersey, 1976).ĭawson, G. Bioenergetics and Growth (Reinhold, New York, 1945).Īmann, R. King's College Research Centre Sociobiology Project) (Cambridge University Press, in the press).īrody, S. in Reproductive Biology of the Great Apes (ed. ![]() A Fieldstudy on Sumatran Orang Utans (Veenman & Zonen, Wageningen, 1978). H.) (Australian Academy of Science, Canberra, 1977). in Reproduction and Evolution (eds Calaby, J. The relative size of testes may, therefore, provide a valuable clue to the breeding system of a primate species. We have tested this prediction across a wide range of primates, and the results support the hypothesis. ![]() ![]() If this is correct, it implies that primates in which more than one male mates with each oestrous female should have larger testes relative to their body weight than those with single-male breeding systems. For the chimpanzee, therefore, we hypothesize that selection will favour the male that can deposit the largest number of sperm thus the volume of spermatogenic tissue and hence testis size is far greater in the chimpanzee than in the gorilla or orangutan. Male chimpanzees tend to be larger than females, with males reaching an average weight of 55 kg (121 lbs) while females reach an average weight of. However, in the chimpanzee, several males mate frequently with the oestrous females, so that each male has to deposit enough sperm to compete with the presence of sperm from other males. The size of chimpanzees can vary depending on the subspecies, with the average adult weighing between 37 and 70 kg (80-154 lbs) and reaching lengths of up to 1.7 meters (5.6 feet). Male gorillas and orangutans copulate infrequently, and when a female comes into oestrus she normally mates with only one male. Recently it has been suggested that among the three species of Pongidae (the great apes), the disparity in testes weights is associated with their different breeding systems 2–4. It has long been known that primate species differ greatly in the weight of their testes relative to body weight 1. ![]()
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