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Intergroup encounters in wild moor macaques (Macaca maurus).

Kyoko Okamoto1, Shuichi Matsumura

  • 1Kyoto University. okamoto@tokaigakuen-c.ac.jp

Primates; Journal of Primatology
|June 26, 2002
PubMed
Summary

Moor macaque intergroup encounters in Indonesia showed no female aggression or body contact, differing from Japanese macaques. Existing models need revision to explain macaque social behavior variations.

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Area of Science:

  • Primate behavior
  • Ethology
  • Animal social dynamics

Background:

  • Understanding intergroup dynamics is crucial for primate social behavior studies.
  • Previous models of female dominance styles in macaques require further socioecological validation.

Purpose of the Study:

  • To analyze the frequency and characteristics of intergroup encounters among Indonesian moor macaques (Macaca maurus).
  • To compare moor macaque intergroup behaviors with those of other macaque species, specifically Japanese macaques.
  • To evaluate existing models of primate social behavior against observed moor macaque interactions.

Main Methods:

  • Observational study of moor macaques at Karaenta Nature Reserve, South Sulawesi, Indonesia.
  • Analysis of 85 intergroup encounters recorded between September 1990 and November 1998.
  • Individual identification of macaques within Group B for detailed behavioral recording.

Main Results:

  • The average frequency of intergroup encounters was 0.035 per hour.
  • Encounter frequency was not influenced by the presence of estrous females or rainfall.
  • Moor macaques exhibited no intergroup interactions involving body contact, and females did not display aggression towards other groups.

Conclusions:

  • Moor macaque intergroup behavior, particularly female interactions, differs significantly from patterns observed in Japanese macaques.
  • The study's findings do not support the predictions of van Schaik's (1989) model regarding female dominance styles.
  • Socioecological factors require further investigation to adequately explain variations in female dominance and social behavior across macaque species.

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