SEX RATIO AND DENSITY AFFECT SEXUAL SELECTION IN A SEX-ROLE REVERSED FISH
SEX RATIO AND DENSITY AFFECT SEXUAL SELECTION IN A SEX-ROLE REVERSED FISH
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DOI：
10.1111/evo.12201
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发表时间：
2013-11-01
期刊：
影响因子：
3.3
通讯作者：
Rosenqvist, Gunilla
中科院分区：
文献类型：
--
作者：
Aronsen, Tonje;Berglund, Anders;Rosenqvist, Gunilla
了解人口过程如何影响交配系统是重要的解码生态影响性选择的性质。我们操纵性比和密度的实验种群的性别角色逆转海龙typhle。我们使用贝特曼梯度（beta'ss）、选择机会（I）、性选择（Is）和最大标准化性选择差异（s（max））来量化性选择。我们还测量了选择的体长标准化选择差异（S '）和交配差异（M'），并测试是否观察到的I和Is从模拟随机交配获得的值不同。我们发现，I，Is和s '（最大值），但不是β'（ss），女性高于男性偏见和男性相反，但密度并不影响这些措施。然而，较高的密度降低了雌性体长的性选择（m类似于但不是s '），但体长的选择不受性比的影响。最后，是但不是我高于预期的随机交配，只有女性的女性偏见。这项研究表明，性别比例和密度影响性选择，解开相互关联的人口过程是必不可少的交配行为和交配系统的进化更完整的理解。
Understanding how demographic processes influence mating systems is important to decode ecological influences on sexual selection in nature. We manipulated sex ratio and density in experimental populations of the sex-role reversed pipefish Syngnathus typhle. We quantified sexual selection using the Bateman gradient (beta'ss), the opportunity for selection (I), and sexual selection (Is), and the maximum standardized sexual selection differential (s(max)). We also measured selection on body length using standardized selection differentials (s') and mating differentials (m'), and tested whether the observed I and Is differ from values obtained by simulating random mating. We found that I, Is, and s'(max), but not beta'(ss), were higher for females under female than male bias and the opposite for males, but density did not affect these measures. However, higher density decreased sexual selection (m similar to but not s') on female length, but selection on body length was not affected by sex ratio. Finally, Is but not I was higher than expected from random mating, and only for females under female bias. This study demonstrates that both sex ratio and density affect sexual selection and that disentangling interrelated demographic processes is essential to a more complete understanding of mating behavior and the evolution of mating systems.