Can sexual selection and disassortative mating contribute to the maintenance of a shell color polymorphism in an inter- tidal marine snail？
Can sexual selection and disassortative mating contribute to the maintenance of a shell color polymorphism in an inter- tidal marine snail？作者机构：Departamento de Bioqufmica Genetica e Inmunologfa Facultad de Biologfa Universidad de Vigo Campus de Vigo 36310 VigoSpain
出 版 物：《Current Zoology》 (动物学报（英文版）)
年 卷 期：2012年第58卷第3期
页 面：463-474页
核心收录：
学科分类：0710[理学-生物学] 07[理学] 070703[理学-海洋生物学] 0707[理学-海洋科学] 0905[农学-畜牧学] 0906[农学-兽医学] 0713[理学-生态学]
基 金：Ministerio de Ciencia e Inovacion (MCI) Fondos Feder and Xunta de Galicia supported by a FPI research grant from the MCI (Spain) supported by a Parga Pondal fellowship from Xunta de Galicia
主 题：多态性 潮间带 交配 壳色 蜗牛 频率依赖性 海洋 颜色变化
摘 要：Littorina fabalisis an intertidal snail commonly living on the brown algaeFucus vesiculosusand showing frequent shell-color polymorphisms in the wild. The evolutionary mechanism underlying this polymorphism is currently unknown. Shell color variation was studied in mated and non-mated specimens of this species from different microareas in one locality from NW Spain, in order to estimate sexual selection and assortative mating that may (still) be operating in this population. The analyses across microareas allowed us to investigate frequency-dependent selection and assortative mating components, mechanisms that could maintain the polymorphism. The presence of shell scars caused by crab attacks, an environmental variable not related with sexual selection or assortative mating, was used as experimental control. This study provides new evidence of significant disas-sortative mating and some degree of sexual selection against some shell colors, supporting the results found 21 years ago in a similar study, i.e. in the same species and locality. The similarity of these estimates during the studied period suggests that this experimental approach is consistent and valid to be extended to other populations and organisms. In addition, sexual selection and assortative mating estimates did not change across microareas differing in shell color frequencies, suggesting than the polymorphism can not be maintained by a frequency-dependent (sexual selection-based) mechanism. Our main hypothesis is that negative assortative mating could contribute to the maintenance of the polymorphism, perhaps by males showing distinct female color preferences when searching for mates.
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