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Predation risk and the number of adult males in a primate group: a comparative test

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Abstract

The number of adult males in a bisexual primate group is thought to be determined mainly by the defensibility of mating access to the females. However, among primates, small groups sometimes contain several adult male. We evaluate the hypothesis that high predation risk may lead to greater male representation in primate groups, independent of the effect of group size. Male primates are known to be more vigilant than females, and may also be better at detecting potential predators. A comparative test was done using arboreal folivores in three continents, howler monkeys in the Neotropics, colobus monkeys in Africa and langurs in South and Southeast Asia. Howlers and colobus are exposed to predation by large monkey-eating eagles, whereas the langurs are not. We conducted regression analyses on group composition data of single populations and on mean group compositions among populations, and found that the arboreal langurs basically live in groups with only a single adult males whereas groups of howler and colobus monkeys of comparable size have multiple adult males (Fig. 3). Thus, the hypothesis was supported. Several alternative hypotheses do not account for this pattern.

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  1. Mark Hörstermann

    Present address: Theodor-Boveri-Institut fur Biowissenschaften, Zoologie III, Biozentrum, Am Hubland, 97074, Würzburg, Germany

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  1. Department of Biological Anthropology and Anatomy, Duke University, 3705 B Erwin Road, 27705, Durham, NC, USA

    Carel P. van Schaik

  2. Department of Zoology, Duke University, 27706, Durham, NC, USA

    Mark Hörstermann

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Schaik, C.P.v., Hörstermann, M. Predation risk and the number of adult males in a primate group: a comparative test. Behav Ecol Sociobiol 35, 261–272 (1994). https://doi.org/10.1007/BF00170707

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