Are assortative mating and genital divergence driven by reinforcement?
Are assortative mating and genital divergence driven by reinforcement?
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DOI：
10.1002/evl3.85
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发表时间：
2018-12-01
影响因子：
5
通讯作者：
Butlin, Roger K.
中科院分区：
文献类型：
--
作者：
Hollander, Johan;Montano-Rendon, Mauricio;Butlin, Roger K.
选择性交配的进化是物种形成过程的关键部分。较强的品种，或更大的分歧，交配性状，种对重叠的范围是常见的，但这种模式的生殖特征位移的可能原因是难以区分的。我们使用一个多学科的方法提供了一个罕见的例子，它是可能的生殖特性位移的进化的假设之间进行区分。我们建立在早期的比较分析的基础上，该分析说明了在海洋腹足类（滨螺科）的一个大分支中，范围重叠的姐妹物种对之间的阴茎形式差异比异地姐妹物种对之间的差异更大。我们调查的姐妹物种对之一，在男性生殖器的交配和分歧，歧视三个对比的过程中，每一个可以产生一种模式的生殖特征位移：加固，生殖干扰和邓普顿效应。我们证明了生殖特征位移的选择性交配，但不是在这对姐妹物种之间的生殖器形式，并使用人口模型来区分不同的过程。我们的研究结果支持一个模型，没有基因流，因为二次接触，从而有利于生殖干扰的原因，生殖性状位移的配偶选择，而不是加强。物种内部的高基因流动与邓普顿效应相悖。二次接触似乎对生殖器的分歧几乎没有影响。
The evolution of assortative mating is a key part of the speciation process. Stronger assortment, or greater divergence in mating traits, between species pairs with overlapping ranges is commonly observed, but possible causes of this pattern of reproductive character displacement are difficult to distinguish. We use a multidisciplinary approach to provide a rare example where it is possible to distinguish among hypotheses concerning the evolution of reproductive character displacement. We build on an earlier comparative analysis that illustrated a strong pattern of greater divergence in penis form between pairs of sister species with overlapping ranges than between allopatric sister-species pairs, in a large clade of marine gastropods (Littorinidae). We investigate both assortative mating and divergence in male genitalia in one of the sister-species pairs, discriminating among three contrasting processes each of which can generate a pattern of reproductive character displacement: reinforcement, reproductive interference and the Templeton effect. We demonstrate reproductive character displacement in assortative mating, but not in genital form between this pair of sister species and use demographic models to distinguish among the different processes. Our results support a model with no gene flow since secondary contact and thus favor reproductive interference as the cause of reproductive character displacement for mate choice, rather than reinforcement. High gene flow within species argues against the Templeton effect. Secondary contact appears to have had little impact on genital divergence.