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Local Variance in Alouatta Group Size and Food Availability on Barro Colorado Island
Steven J. C. Gaulin, Dennis H. Knight and Cynthia K. Gaulin
Vol. 12, No. 2 (Jun., 1980), pp. 137-143
Published by: Association for Tropical Biology and Conservation
Stable URL: http://www.jstor.org/stable/2387729
Page Count: 7
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Local variances in group size and density of Alouatta palliata on Barro Colorado Island are reported, and their relationship to local variance in the density of food and non-food species is investigated via nonparametric statistical techniques. Group size is significantly and positively related to the density of two major food species but not to the density of minor food species or non-food species. The density of Ficus spp., which supply over half the diet by weight and which have complex, asynchronous, phenological cycles, is highly correlated with group size over nine study plots. This relationship is interpreted as the result of differential reproductive success and lower levels of intragroup competition for food in areas of high Ficus density.
Biotropica © 1980 Association for Tropical Biology and Conservation