Sexual selection: when to expect trade-offs
Sexual selection: when to expect trade-offs
复制标题
性选择：何时需要权衡
作者：
D. Shutler
经验证据是混合的种间权衡性选择性状之间的投资。一个重要的原因可能是资源在物种之间的分配方式。考虑一组物种，它们在歌声或羽毛上的投资获得了相同的适应性回报。在物种间资源正态分布的模拟中，发现鸣唱和羽毛之间存在显著的权衡（± s.d.）。r =-0.54 ± 0.06）。然而，资源以负二项分布的模拟通常产生正相关（r = 0.11 ± 0.09）。重复模拟三个已发表的研究，同时量化的歌曲和羽毛的阐述表明，权衡是可能的，虽然这些分析作出的假设，需要进一步评估。此外，目前有太少的经验分布作出概括的可能性种间权衡性选择的性状。
Empirical evidence is mixed for interspecific trade-offs in investment among sexually selected traits. One important reason may be the way resources are allocated among species. Consider a set of species that obtains the same fitness pay-off for investment in song or plumage. Simulations where resources were normally distributed among species revealed significant trade-offs between song and plumage ( ± s.d. of r = −0.54 ± 0.06). However, simulations where resources were distributed in a negative binomial fashion usually produced positive correlations (r = 0.11 ± 0.09). Repeating simulations on three published studies that concomitantly quantified elaboration of song and plumage indicated that trade-offs are likely, although these analyses make assumptions that require further evaluation. Moreover, there are currently too few empirical distributions to make generalizations about the likelihood of interspecific trade-offs in sexually selected traits.