Habitat heterogeneity, predation and gene flow:: Colour polymorphism in the isopod, Idotea baltica
Habitat heterogeneity, predation and gene flow:: Colour polymorphism in the isopod, Idotea baltica
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DOI：
10.1023/a:1013814623311
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发表时间：
2001-01-01
影响因子：
1.9
通讯作者：
Merilaita, S
中科院分区：
文献类型：
--
作者：
Merilaita, S
颜色多形性等足动物Idotea baltica栖息于褐藻Fucus vesiculosus中，褐藻通常由白色绿长石Electra甲壳藻（苔藓虫）定居。在一项实验中，不同颜色的波罗的海蠓的捕食风险高度依赖于背景颜色。形态频率和Electra密度在10个采集点之间差异很大，但相互之间相关性较差，表明对隐色的局部选择可能被基因流抵消。事实上，基于四种多态同工酶的估计表明，基因流动的速度很高。这些结果支持了一种假设，即基因流动抵消了局部变化的隐色选择，有助于维持波罗的海蝇的颜色多态性。微生境之间的视觉差异和雄性和雌性对微生境的不同使用似乎导致了雄性和雌性对隐色的不同选择模式。这也可能对多态性起重要作用。
The colour polymorphic isopod Idotea baltica inhabits the brown alga Fucus vesiculosus which is often colonised by the white epizoite Electra crustulenta (Bryozoa). In an experiment the predation risk for the different colour morphs of I. baltica was highly dependent on background colouration. Morph frequencies and Electra density varied substantially among 10 collecting sites but correlated poorly with each other, suggesting that local selection for cryptic colouration may be counteracted by gene flow. Indeed, estimates based on four polymorphic allozymes suggested rate of gene flow to be high. These results support the hypothesis that locally varying selection for cryptic colouration counteracted by gene flow contributes to the maintenance of colour polymorphism in I. baltica. The visual differences between the microhabitats and the differential microhabitat use between males and females seem to result in different patterns of selection on males and females for cryptic colouration. Also this is likely to play an important role for the polymorphism.