Ecological correlates of extra-group paternity in mammals
Ecological correlates of extra-group paternity in mammals
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DOI：
10.1098/rspb.2006.3723
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发表时间：
2007-01-22
影响因子：
4.7
通讯作者：
Clutton-Brock, Tim
中科院分区：
文献类型：
--
作者：
Isvaran, Kavita;Clutton-Brock, Tim
群外父系关系（EGP）是鸟类和哺乳动物交配系统的重要组成部分。然而，我们目前对它的范围和生态的了解主要来自鸟类。在这里，我们使用的数据从26个物种和系统发育的比较方法，探讨种间变异的EGP在哺乳动物和测试突出的生态假说，这种变化。我们发现了广泛的EGP（46%的物种显示超过20%的EGP），这表明EGP可能在哺乳动物的交配系统和性选择动态中发挥重要作用。在EGP的变化是最密切相关的交配季节的长度。随着交配季节长度的增加，EGP下降，这表明，它是越来越难以为男性垄断他们的社会伴侣时，交配季节短，女性在发情期的重叠很可能是高的。EGP是次要相关的繁殖组中的女性数量，一致的想法，作为女性集群的增加，男性是不太能够垄断个别女性。最后，EGP是不相关的社会交配制度，这表明，为组外受精的机会和所涉及的回报并不一致的社会交配制度的变化。
Extra-group paternity ( EGP) can form an important part of the mating system in birds and mammals. However, our present understanding of its extent and ecology comes primarily from birds. Here, we use data from 26 species and phylogenetic comparative methods to explore interspecific variation in EGP in mammals and test prominent ecological hypotheses for this variation. We found extensive EGP ( 46% of species showed more than 20% EGP), indicating that EGP is likely to play an important role in the mating system and the dynamics of sexual selection in mammals. Variation in EGP was most closely correlated with the length of the mating season. As the length of the mating season increased, EGP declined, suggesting that it is increasingly difficult for males to monopolize their social mates when mating seasons are short and overlap among females in oestrus is likely to be high. EGP was secondarily correlated with the number of females in a breeding group, consistent with the idea that as female clustering increases, males are less able to monopolize individual females. Finally, EGP was not related to social mating system, suggesting that the opportunities for the extra-group fertilizations and the payoffs involved do not consistently vary with social mating system.