Inbreeding risk, avoidance and costs in a group-living primate, Cebus capucinus
Inbreeding risk, avoidance and costs in a group-living primate, Cebus capucinus
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DOI：
10.1007/s00265-016-2168-1
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发表时间：
2016-09-01
影响因子：
2.3
通讯作者：
Perry, Susan E.
中科院分区：
文献类型：
--
作者：
Godoy, Irene;Vigilant, Linda;Perry, Susan E.
记录近亲繁殖及其在野生种群中的潜在成本是一件复杂的事情。在收集基因样本之前婴儿过早死亡限制了研究人员衡量健康成本的能力，而血统信息对于准确估计繁殖个体之间的亲缘关系是必要的。利用洛玛斯巴布达尔卷尾猴项目25年来的研究数据，以及109只已生育的雌性卷尾猴的样本，我们发现，尽管成年异性个体经常与成年异性共居，但卷尾猴与近亲(即同父异母或更高级别的亲属)生育后代的频率低于预期，在没有近亲繁殖避免的情况下。我们没有找到对这种模式的替代的、非行为的解释的支持，因此我们认为应该选择配偶。此外，我们发现近亲交配动物的健康成本有证据表明，第一次出生的女性年龄推迟了，但幼年死亡率并没有显著提高。为了确定个体对近亲产生性厌恶的机制，有必要进行进一步的研究。通过结合人口统计记录、母系谱系和基因决定的父子关系，这项研究提供了对经过充分研究的哺乳动物种群中近亲繁殖和近亲繁殖避免的详细研究。这项研究提供了(1)卷尾猴在亲子和同父异母的水平上避免与近亲交配的证据，以及(2)近亲繁殖的适合性代价以繁殖时第一个年龄延迟的形式存在的证据。
Documenting inbreeding and its potential costs in wild populations is a complicated matter. Early infant death before genetic samples can be collected limits the ability of researchers to measure fitness costs, and pedigree information is necessary to accurately estimate relatedness between breeding individuals. Using data from 25 years of research from the Lomas Barbudal Capuchin Monkey Project, and a sample of 109 females that have given birth, we find that despite frequent co-residency of adult opposite-sexed individuals, capuchins produce offspring with close kin (i.e., related at the half-sibling level or higher) less often than would be expected in the absence of inbreeding avoidance. We do not find support for alternative, non-behavioral explanations for this pattern and thus argue for mate choice. Furthermore, we find evidence for fitness costs among inbred animals in the form of delayed female age at first birth but not significantly higher juvenile mortality. Further research is necessary in order to determine the mechanisms by which individuals develop sexual aversion to close kin. Through a combination of demographic records, maternal pedigrees, and genetically determined paternity, this study provides a detailed study of inbreeding and inbreeding avoidance in a well-studied mammal population. This study provides (1) evidence that capuchin monkeys avoid mating with close kin at both the level of parent-offspring and half sibling and (2) evidence of fitness costs to inbreeding in the form of delayed first age at reproduction.