Manson J H, Perry S E
Department of Anthropology, University of Michigan, Ann Arbor 48109-1382.
Am J Phys Anthropol. 1993 Mar;90(3):335-44. doi: 10.1002/ajpa.1330900307.
Whether nonhuman primates avoid copulating with close kin living in their social group is controversial. If sexual aversion to relatives occurs, it should be stronger in females than in males because of females' greater investment in each offspring and hence greater costs resulting from less viable offspring. Data presented here show that adult male rhesus macaques breeding in their natal groups at Cayo Santiago experienced high copulatory success, but copulated less with females of their own matrilineages than with females of other matrilineages. Adult females were never observed to copulate with males of their own matrilineage during their fertile periods. Although natal males sometimes courted their relatives, examination of two measures of female mate choice showed that females chose unrelated natal males over male kin. Female aversion to male kin was specific to the sexual context; during the birth season, females did not discriminate against their male relatives in distributing grooming. Evolved inbreeding avoidance mechanisms probably produce different outcomes at Cayo Santiago than in wild rhesus macaque populations. Gender differences in sexual aversion to relatives may be partly responsible for differences between studies in reported frequency of copulations by related pairs.
非人灵长类动物是否会避免与生活在其社会群体中的近亲交配存在争议。如果存在对亲属的性厌恶，那么在雌性中应该比在雄性中更强烈，因为雌性对每个后代的投入更大，因此因后代生存能力较低而产生的代价也更大。此处呈现的数据表明，在圣地亚哥岛其出生群体中繁殖的成年雄性恒河猴交配成功率很高，但与同母系的雌性相比，与其他母系的雌性交配较少。在成年雌性的排卵期从未观察到它们与同母系的雄性交配。尽管出生群体中的雄性有时会向其亲属求爱，但对雌性配偶选择的两项指标进行的研究表明，雌性会选择出生群体中无亲属关系的雄性而非有亲属关系的雄性。雌性对雄性亲属的厌恶仅限于性方面；在生育季节，雌性在分配梳理行为时不会歧视其雄性亲属。在圣地亚哥岛进化出的避免近亲繁殖机制可能与野生恒河猴种群产生不同的结果。对亲属性厌恶的性别差异可能部分导致了不同研究中所报告的亲属配对交配频率差异。
