FOOD COMPETITION IN BROWN CAPUCHIN MONKEYS (CEBUS APELLA): QUANTITATIVE EFFECTS OF GROUP SIZE AND TREE PRODUCTIVITY by CHARLES H. JANSON1) (Department of Ecology and Evolution, State University of New York, Stony Brook, NY 11794, U.S.A.) (With 8 Figures) (Acc. 14-XII-1987) Introduction The idea that the fitness of individuals in a social group may be limited by energy acquisition underlies much socioecological research on pri- mates (e.g., DENHAM, 1971; S. ALTMANN, 1974; CLUTTON-BROCK & HARVEY, 1976, 1977; DITTUS, 1977; WRANGHAM, 1980; J. ALTMANN, 1980; VAN SCHAIK, 1983; TERBORGH, 1983; JANSON, 1985; STACEY, 1986). Despite much circumstantial evidence that an individual's food intake is affected by its social status and group size (e.g., SOUTHWICK, 1967; WASER, 1977; DITTUS, 1977; POST et al., 1980; LEIGHTON & LEIGHTON, 1982), it is difficult to use these studies to infer the possible fitness consequences of these social traits because: 1) results are often reported as correlations, and 2) studies are frequently based on only a subset of the species' diet. Correlations are useful for suggesting possible causal links between two variables, but have limited value for quan- titativc comparisons among species because an infinity of linear relation- ships between two variables can yield the
Behaviour – Brill
Published: Jan 1, 1988
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