Fifty years of chimpanzee demography at Taronga Park Zoo

Article Abstract:

Demographic data on chimpanzees at the 'Pan troglodytes' colony of Taronga Park Zoo in Sydney, Australia, were analyzed in conjunction with data from wild populations to establish the degree of variability present within chimpanzee reproductive parameters, and to identify which distinctive life history characteristics persist in well-provisioned, natural-fertility populations. The data confirm that aspects of both fertility and mortality are significantly related to social circumstances, indicating that in common chimpanzees, as in humans, life history characters might represent ecological and social adaptations rather than species-fixed characteristics.

Australia, Mortality, Chimpanzees

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Demography, range use, and behavior in Black Lemurs (Eulemur macaco macaco) at Ampasikely, northwest Madagascar

Article Abstract:

A study was conducted on lemur population over a 2-year period from 1992-1993 and 8 year later in 2000 in a 50-ha secondary forest in northwest Madagascar to investigate population dynamics and seasonal variation in ranging and behavior. Patterns of intragroup interactions suggest that males compete for access to groups of females during the mating season, and that females might compete for food resources during the birth season while the study also reports female social dominance and lack of sexual weight dimorphism in this species.

Madagascar, Lemurs

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Male mating strategies and reproductive constraints in a group of wild tufted capuchin monkeys (Cebus apella nigritus)

Article Abstract:

Data were collected to study the sexual interactions in one wild capuchin group at the Estacao Biologica de Caratinga in Brazil from September 1996 to August 1997 and it was observed that male mating strategies were affected by both season and rank, and there was evidence for reproductive constraints on males throughout the year. Limited male ejaculatory capacity and male choice in the timing of copulations within female proceptive phases might be important factors in driving the sexual dynamics of this species.

Brazil, Analysis, Sexual behavior in animals, Animal sexual behavior, Capuchin monkeys, Animal sexual behaviour

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