Sexual selection on phenotypic traits in a hybrid zone of Littorina saxatilis (Olivi)
Sexual selection on phenotypic traits in a hybrid zone of Littorina saxatilis (Olivi)
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DOI：
10.1046/j.1420-9101.2001.00324.x
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发表时间：
2001-09-01
影响因子：
2.1
通讯作者：
García, C
中科院分区：
文献类型：
--
作者：
Cruz, R;Rolán-Alvarez, E;García, C
在遗传上不同的群体之间遗传性状的阶跃过渡通常被称为杂种区。一个例子是在加利西亚（西班牙西北部）的潮间带蜗牛Littorina saxatilis种群中发现的。我们研究了在这个混合区的性别选择的整体适应面的形状，以及在这个表面上的杂交和纯变体的位置。我们发现，性趋异选择作用于分离纯变体的表型性状的组合，因此，性选择有助于形态分化。杂种作为一个群体的平均适合度与纯变体的平均适合度没有显著差异，但它们在某些性状上确实表现出分歧的性选择。这些结果是在协议的一个模型的分歧选择有利于纯的变形，以及那些杂交最相似的每个变形。发散选择的发现是显著的，因为二次选择梯度通常在性质上是弱的。
Step clinal transitions in inherited character(s) between genetically distinct populations are usually referred to as hybrid zones. An example is found in the population of the intertidal snail Littorina saxatilis in Galicia (NW Spain). We studied the shape of the overall fitness surface for sexual selection in this hybrid zone, and the position of hybrids and pure morphs on this surface. We found that sexual divergent selection acted on a combination of phenotypic traits separating the pure morphs, and therefore that sexual selection contributed to morph differentiation. The average fitness of hybrids as a group was not significantly different from that of the pure morphs, but they did show divergent sexual selection in some traits. These results are in agreement with a model of divergent selection favouring both the pure morph as well as those hybrids most resembling each morph. The finding of divergent selection is remarkable because quadratic selection gradients are usually weak in nature.