Sexual Selection and Genital Evolution in Mammals: A Phylogenetic Analysis of Baculum Length
Sexual Selection and Genital Evolution in Mammals: A Phylogenetic Analysis of Baculum Length
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哺乳动物的性选择和生殖器进化：阴茎长度的系统发育分析
DOI：
10.1086/510688
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发表时间：
2007
期刊：
影响因子：
--
通讯作者：
S. A. Ramm
中科院分区：
文献类型：
--
作者：
S. A. Ramm
对无脊椎动物分类群的研究表明，交配后的性别选择是生殖器进化的一个重要因素。然而，尽管生殖器形态在种间差异很大，但性别选择对哺乳动物生殖器影响的证据是模棱两可的。在这里，我对四个哺乳动物目进行了系统发育控制的比较分析，以评估这种变异的一个方面--男性生殖器长度--如何与(A)男性体重和(B)相对睾丸质量进行衡量，后者提供了精子竞争强度的指数。在所有四个目中，阴茎长度与雄性体重的比例都很小。啮齿类动物的阴茎和龟头长度以及肉食动物的阴茎长度与相对睾丸质量呈正相关。相比之下，无论是蝙蝠还是灵长类动物，都没有证据支持杆状突起长度和相对睾丸质量之间的联系。这些结果表明，交配后的性选择影响了至少某些哺乳动物的生殖器长度，但仍然存在一些重要的问题，比如为什么哺乳动物群体在生殖器上的选择应该不同，以及雄性从生殖器长度增加中受益的确切机制基础。
Studies in invertebrate taxa suggest that postcopulatory sexual selection is an important factor in genital evolution. However, despite wide interspecific variation in genital morphology, evidence for an influence of sexual selection on mammalian genitalia is equivocal. Here I conduct phylogenetically controlled comparative analyses across four mammalian orders to assess how one aspect of this variation—male genital length—scales with (a) male body mass and (b) relative testis mass, the latter providing an index of the intensity of sperm competition. In all four orders, baculum (=os penis) length is found to scale only weakly with male body mass. Both baculum and glans penis length in rodents and baculum length in carnivores are found to vary positively with relative testis mass. In contrast, there is no evidence to support an association between baculum length and relative testis mass in either bats or primates. These results suggest that postcopulatory sexual selection influences genital length in at least some mammals, but significant questions remain both as to why selection on the baculum should differ between mammalian groups and as to the precise mechanistic basis through which males benefit from increased genital length.
大鼠（褐家鼠）的交配生育力：雄激素依赖性阴茎形态和行为的贡献。
DOI：
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发表时间：
1986
期刊：
Journal of comparative psychology (Washington, D.C. : 1983)
影响因子：
--
作者：
O'Hanlon,JK;Sachs,BD
通讯作者：
Sachs,BD