Giokas S, Mylonas M, Rolán-Alvarez E
Department of Animal Biology, Faculty of Biology, University of Patras, 26500 Patras, Greece.
J Evol Biol. 2006 Sep;19(5):1631-40. doi: 10.1111/j.1420-9101.2006.01115.x.
Examination of the association between reproductive isolation and genetic divergence in a variety of organisms is essential for elucidating the mechanisms causing speciation. However, such studies are lacking for hermaphrodites. We measured premating (sexual) isolation in species pairs of the hermaphroditic land snail Albinaria and we compared it with their genetic divergence. We did not find substantial sexual isolation barriers between the species studied. The absence of strong sexual isolation between species implies its minor effect in the evolution of this genus, because distributional, population and life-history characteristics of Albinaria make mate-choice possibly redundant. Furthermore, we found disassociation between genetic divergence and sexual isolation, suggesting that they do not form necessarily a cause-effect duet. However, Albinaria voithii, the only dextral Albinaria species, shows strong sexual isolation against the other sinistral species. We discuss whether change in coiling either has triggered instantaneous speciation, or is an example of character displacement.
研究各种生物体中生殖隔离与遗传分化之间的关联对于阐明物种形成机制至关重要。然而，对于雌雄同体生物的此类研究却很匮乏。我们测量了雌雄同体陆生蜗牛阿尔比纳里亚物种对之间的交配前（性）隔离，并将其与它们的遗传分化进行了比较。我们在所研究的物种之间未发现实质性的性隔离障碍。物种之间缺乏强烈的性隔离意味着其在该属的进化中作用较小，因为阿尔比纳里亚的分布、种群和生活史特征使得配偶选择可能变得多余。此外，我们发现遗传分化与性隔离之间没有关联，这表明它们不一定构成因果关系。然而，唯一的右旋阿尔比纳里亚物种沃氏阿尔比纳里亚对其他左旋物种表现出强烈的性隔离。我们讨论了螺壳旋向的变化是触发了瞬间物种形成，还是特征取代的一个例子。
