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Male mating patterns in wild multimale mountain gorilla groups.

Robbins1

  • 1Department of Zoology, University of Wisconsin-Madison

Animal Behaviour
|April 7, 1999
PubMed
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Multimale mountain gorilla groups offer mating opportunities for subordinate males, challenging the one-male system classification. Dominant males still achieve more matings, but subordinate males gain access, especially with younger females.

Area of Science:

  • Primate Behavior
  • Conservation Biology
  • Animal Reproduction

Background:

  • Mountain gorillas (Gorilla gorilla beringei) are often classified with a one-male mating system.
  • However, a significant proportion (40%) of social units are multimale groups.
  • Understanding mating dynamics in these multimale groups is crucial for accurate species classification.

Purpose of the Study:

  • To investigate male mating patterns in multimale mountain gorilla groups.
  • To analyze male-male mating harassment in relation to dominance rank and female reproductive status.
  • To determine if subordinate males gain mating opportunities in multimale social units.

Main Methods:

  • 17-month observational study of two multimale mountain gorilla groups in Rwanda.

Related Experiment Videos

  • Detailed recording of mating behaviors, dominance interactions, and female reproductive states.
  • Analysis of mating frequency, harassment incidents, and associated factors.

    • Main Results:

    • Dominant males engaged in significantly more matings than subordinate males.
    • Dominant males preferentially mated with cycling adult and pregnant females.
    • Subordinate males were more likely to mate with subadult females, and multiple males mated with females near conception.

    Conclusions:

    • Multimale mountain gorilla groups can provide mating opportunities for subordinate males.
    • Dominant males may not always prevent subordinate mating, suggesting flexibility in the mating system.
    • Further research is needed on female roles and paternity to fully understand mountain gorilla mating systems.