Reproductive Character Displacement in Genital Morphology in Satsuma Land Snails
Reproductive Character Displacement in Genital Morphology in Satsuma Land Snails
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DOI：
10.1086/597607
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发表时间：
2009-05-01
影响因子：
2.9
通讯作者：
Kato, Makoto
中科院分区：
文献类型：
--
作者：
Kameda, Yuichi;Kawakita, Atsushi;Kato, Makoto
当物种在异种中分化并进入二次接触时，自然选择可能倾向于性状分化，以促进伴侣歧视和避免交配干扰。这个过程被称为强化，它通常会导致交感神经区域交配相关性状的更大分化（生殖性状位移）。这种模式通常表现在早熟信号中，但关于种间交配如何影响生殖器的形态进化却知之甚少。在这里，我们提出的生殖特征位移的证据在生殖形态的两个陆地蜗牛种萨摩属。形态计量学分析清楚地揭示了阴茎和阴道长度更大的同域差异，而不考虑环境、遗传和地理的影响。这是在昆虫以外的生物中首次证明生殖特征在生殖特征上发生了位移，并强调了分析以前被忽视的生殖形态对理解陆地蜗牛合子前分离的一般机制的重要性。
When species diverge in allopatry and come into secondary contact, natural selection might favor character divergence to facilitate partner discrimination and avoid mating interference. This process is called reinforcement, which typically results in greater differentiation in mating-associated traits in areas of sympatry (reproductive character displacement). Such patterns are usually manifest in premating signals, but little is known about how interspecific mating affects the morphological evolution of genitalia. Here, we present evidence of reproductive character displacement in genital morphology in two land snail species of the genus Satsuma. Morphometric analyses clearly revealed greater sympatric divergences in penis and vagina lengths, regardless of the environmental, genetic, and geographic effects. This is the first demonstration of reproductive character displacement in genital characters in an organism other than insects and highlights the importance of analyzing previously overlooked genital morphologies in understanding the general mechanisms of prezygotic isolation in land snails.