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Surpeuplement, fécondité, mortalité et agressivité dans une population captive de Papio papio

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Title: Surpeuplement, fécondité, mortalité et agressivité dans une population captive de Papio papio
Author: Masure, A.M.; Bourlière, F.
Abstract: A social group of 60 western baboons Papio papio, established since 1939, was studied during a 20 month period (actual observa tion time : 450 hours) in the Parc Zoologique du Bois de Vincennes, Paris. The « home range » of the captive troop was 535 m2 and the population density reached 11 monkeys per 100 m2, i.e. 10,000 to 100,000 times higher than that of other savana baboons within their yearly home range in the wild. The ratio Males : Females within the group (infants excluded) was 1 : 2.1. Among adults alone, females were much more nume rous, ranging from 1 : 12.5 to 1 : 22. Yet, there were more male than female infants at birth, 1 : 0.30. The birth rate for adult female baboons was high. The average reproductive rate was of one infant per female every 382 days in 1970, and of one infant per female every 465 days in 1971. The crude death rate was 31 deaths in a total of 39,100 mon- key-days, or 7.93 X 10"4 deaths per monkey-day. Most deaths (20 out of 31) occurred at birth and during the first year of life. The number of agonistic interactions occurring among adults and subadults with sufficient intensity to provoke barking and roaring by males or screaming, screeching and squealing by females was counted, and divided by the total number of hours of observation : 1 agonistic interaction occured every 7.3 minutes. Serious fights involving biting were rare (9 % of the cases). Comparisons are made with various natural populations of savana baboons. Contrary to the situation in most rodent popula tions studied to date, prolonged crowding in baboons does not appear to decrease fertility. The increase of agonistic behaviour is moderate and the death rate remains much the same than in a wild population.
Publisher: Société nationale de protection de la nature et d'acclimatation de France, Paris (FRA)
Date: 1971

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