Postcopulatory sexual selection is associated with reduced variation in sperm morphology.
Postcopulatory sexual selection is associated with reduced variation in sperm morphology.
复制标题
后性性选择与精子形态变化的降低有关。
DOI：
10.1371/journal.pone.0000413
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发表时间：
2007-05-02
期刊：
影响因子：
3.7
通讯作者：
Birkhead, Tim R.
中科院分区：
文献类型：
--
作者：
Calhim, Sara;Immler, Simone;Birkhead, Tim R.
交配后性选择在塑造雄性生殖特征（包括精子形态）中的进化作用在几个分类群中有很好的记载。然而，以前的研究几乎完全集中在精子竞争对物种间变异的影响上。在这项研究中，我们测试了这一假设，即精子形态的种内变异是由雀形目鸟类交配后的性选择水平。使用两个代理措施的精子竞争水平，（i）相对睾丸大小和（ii）extrapair父子关系的水平，我们发现了强有力的证据，精子形态的雄性间变异与交配后的性选择的程度呈负相关，独立于雌激素。我们的研究结果表明，交配后的性选择在精子形态的演变中的作用延伸到种内水平，减少了可能是一个物种特异性的“最佳”精子表型的变化。这一发现表明，虽然交配后的选择通常是定向的（例如，在鸟类物种中，它也作为一种稳定的进化力量，在激烈的选择下，导致精子形态特征的变化减少。我们讨论了这种模式的一些潜在的进化机制。
The evolutionary role of postcopulatory sexual selection in shaping male reproductive traits, including sperm morphology, is well documented in several taxa. However, previous studies have focused almost exclusively on the influence of sperm competition on variation among species. In this study we tested the hypothesis that intraspecific variation in sperm morphology is driven by the level of postcopulatory sexual selection in passerine birds. Using two proxy measures of sperm competition level, (i) relative testes size and (ii) extrapair paternity level, we found strong evidence that intermale variation in sperm morphology is negatively associated with the degree of postcopulatory sexual selection, independently of phylogeny. Our results show that the role of postcopulatory sexual selection in the evolution of sperm morphology extends to an intraspecific level, reducing the variation towards what might be a species-specific ‘optimum’ sperm phenotype. This finding suggests that while postcopulatory selection is generally directional (e.g., favouring longer sperm) across avian species, it also acts as a stabilising evolutionary force within species under intense selection, resulting in reduced variation in sperm morphology traits. We discuss some potential evolutionary mechanisms for this pattern.
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影响因子：
2.4
作者：
Calhim, Sara;Birkhead, Tim R.
通讯作者：
Birkhead, Tim R.
DOI：
10.1111/j.1095-8312.1988.tb01969.x
发表时间：
1988-08-01
影响因子：
1.9
作者：
ALATALO, RV;HOGLUND, J;LUNDBERG, A
通讯作者：
LUNDBERG, A
影响因子：
2
作者：
Anderson, M. J.;Dixson, A. S.;Dixson, A. F.
通讯作者：
Dixson, A. F.
影响因子：
64.8
作者：
Birkhead, TR;Pellatt, EJ;Castillo-Juarez, H
通讯作者：
Castillo-Juarez, H
影响因子：
64.8
作者：
Anderson, MJ;Dixson, AF
通讯作者：
Dixson, AF