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Splitting in Presbytis entellusgroups.

R Mathur1, B R Manohar

  • 1Department of Zoology, University of Rajasthan, Jaipur 302 004, India.

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This summary is machine-generated.

Presbytis entellus social groups split during mating periods, often triggered by male takeovers. This behavior supports the hypothesis of cyclical unimale and multimale group development in this primate species.

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Area of Science:

  • Primatology
  • Ethology
  • Behavioral Ecology

Background:

  • Understanding primate social dynamics is crucial for evolutionary biology.
  • Presbytis entellus (common langur) exhibit complex social structures.
  • Previous hypotheses suggest cyclical group development stages.

Purpose of the Study:

  • To observe and describe the splitting behavior of bisexual Presbytis entellus groups.
  • To investigate the role of all-male groups in social structure changes.
  • To test Hrdy's hypothesis on group development stages.

Main Methods:

  • Longitudinal observation of four bisexual Presbytis entellus groups (September 1985 - April 1987).
  • Recording group composition, interactions, and splitting events.
  • Comparing group dynamics in high-density versus low-density areas.

Main Results:

  • All observed bisexual groups split following takeovers by members of all-male groups.
  • Multimale groups divided into unimale and all-male groups; unimale groups split into two unimale groups.
  • Splitting events coincided with mating periods, with multimale group splits occurring faster than unimale group splits.

Conclusions:

  • Presbytis entellus social groups undergo cyclical development, transitioning between unimale and multimale structures.
  • All-male group takeovers are key drivers of group fission and restructuring.
  • Observations support the hypothesis of a three-stage group development model culminating in unimale grouping.