Genetic diversity and reproductive success in mandrills (Mandrillus sphinx)
Genetic diversity and reproductive success in mandrills (Mandrillus sphinx)
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DOI：
10.1073/pnas.0507205102
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发表时间：
2005-11-15
影响因子：
11.1
通讯作者：
Hossaert-McKey, M
中科院分区：
文献类型：
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作者：
Charpentier, M;Setchell, JM;Hossaert-McKey, M
最近对野生动物种群的研究表明，中性遗传多样性的估计值，如平均杂合度，通常与各种适合度特征相关，如生存、疾病易感性或繁殖成功率。利用遗传多样性的两个估计值，探讨了生活在加蓬半自由放养环境中的雄性和雌性山魈（Mandrillus sphinx）杂合度与生殖成功之间的关系。由于已知社会地位会影响两性的生殖成功，我们还研究了遗传多样性与女性社会地位、男性阿尔法地位的获得以及阿尔法男性任期长短之间的相关性。我们发现杂合个体表现出更高的繁殖成功率，雌性和雄性都能产生更多的后代。然而，杂合性只影响优势雄性的繁殖成功率，而对从属雄性没有影响。无论雄性α地位的获得，还是雌性社会地位的获得，都与杂合度没有显著的相关性，尽管杂合度高的雄性α的任期比纯合度高的雄性α的任期更长。我们还测试了更大的遗传多样性的好处是否主要是由于近交抑制的全基因组效应，还是由于一个或几个位点的杂种优势。多位点效应可以很好地解释杂合度与繁殖成功率和保留期之间的关系，表明该山魈群体存在近交抑制现象。
Recent studies of wild animal populations have shown that estimators of neutral genetic diversity, such as mean heterozygosity, are often correlated with various fitness traits, such as survival, disease susceptibility, or reproductive success. We used two estimators of genetic diversity to explore the relationship between heterozygosity and reproductive success in male and female mandrills (Mandrillus sphinx) living in a semifree ranging setting in Gabon. Because social rank is known to influence reproductive success in both sexes, we also examined the correlation between genetic diversity and social rank in females, and acquisition of alpha status in males, as well as length of alpha male tenure. We found that heterozygous individuals showed greater reproductive success, with both females and males producing more offspring. However, heterozygosity influenced reproductive success only in dominant males, not in subordinates. Neither the acquisition of alpha status in males, nor social rank in females, was significantly correlated with heterozygosity, although more heterozygous alpha males showed longer tenure than homozygous ones. We also tested whether the benefits of greater genetic diversity were due mainly to a genome-wide effect of inbreeding depression or to heterosis at one or a few loci. Multilocus effects best explained the correlation between heterozygosity and reproductive success and tenure, indicating the occurrence of inbreeding depression in this mandrill colony.