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Related Experiment Videos

Inbreeding avoidance in rhesus macaques: whose choice?

J H Manson1, S E Perry

  • 1Department of Anthropology, University of Michigan, Ann Arbor 48109-1382.

American Journal of Physical Anthropology
|March 1, 1993
PubMed
Summary
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Rhesus macaque females avoid mating with male relatives, while males copulate less with female kin. These findings suggest evolved inbreeding avoidance mechanisms influence sexual behavior in primates.

Area of Science:

  • Primate behavior
  • Evolutionary biology
  • Sexual selection

Background:

  • Kin recognition and avoidance of inbreeding are crucial for reproductive success in many species.
  • The occurrence and strength of sexual aversion to relatives in nonhuman primates remain debated.
  • Theoretical models predict stronger sexual aversion in females due to higher reproductive costs associated with inbreeding.

Purpose of the Study:

  • To investigate sexual aversion to kin in rhesus macaques living in their natal groups.
  • To examine gender differences in mating behavior with relatives.
  • To determine if female mate choice influences interactions with male kin.

Main Methods:

  • Observational study of adult male and female rhesus macaques in their natal social groups.

Related Experiment Videos

  • Recording of copulatory events and courtship behaviors.
  • Analysis of female mate choice using two distinct measures.
  • Assessment of non-sexual social interactions (grooming) between relatives.

    • Main Results:

    • Adult males showed high overall copulatory success but copulated less with females from their own matrilineage.
    • Adult females were never observed to copulate with males from their own matrilineage during fertile periods.
    • Female rhesus macaques actively chose unrelated natal males over male kin, indicating specific mate choice.
    • Female aversion to male kin was context-specific, not observed in non-sexual grooming interactions.

    Conclusions:

    • Rhesus macaques exhibit significant sexual aversion to kin, particularly in females.
    • Gender differences in sexual aversion to relatives are evident, with females showing stronger avoidance.
    • Inbreeding avoidance mechanisms appear to shape sexual and social behaviors differently in this primate population.
    • Context-specific aversion suggests evolved strategies to prevent inbreeding and optimize reproductive fitness.