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首页> 外文期刊>Archiv fur Hydrobiologie >Substrate preference in settling zebra mussels Dreissena polymorpha
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Substrate preference in settling zebra mussels Dreissena polymorpha

机译：沉积斑马贻贝Dreissena polymorpha中的基质偏好

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摘要

In a field experiment we compared recruitment of zebra mussels on two types of substrate surface, one flat and the other complex, imitating the heterogeneity of the surface between aggregated mussels. Concrete blocks, each presenting both types of substrate, were suspended horizontally or vertically in the water column along a lake shore. The density of recruits varied from 0 to 1.5 individuals/cm(2) across 92 experimental substrates. Density was not affected by substrate orientation; it was significantly higher on complex than on flat substrates (median 0.32 vs. 0.18 mussels/ cm(2)). This indicates that besides the commonly suggested chemical cues, the complicated surface of mussel aggregates itself may elicit settling on conspecifics. We stress that gregariousness in Dreissena polymorpha may be an evolved antipredation strategy rather than a result of hyperproduction of larvae competing for scarce substrates.
机译：在野外实验中，我们比较了斑马贻贝在两种类型的底物表面上的募集情况，一种是平坦的，另一种是复杂的，模拟了聚集的贻贝之间表面的异质性。每种都带有两种基材的混凝土块沿湖岸水平或垂直地悬挂在水柱中。新兵的密度从0到1.5个人/ cm（2）跨越92个实验衬底。密度不受基材方向的影响;在复合材料上，其含量明显高于在平坦基材上（中值0.32 vs. 0.18贻贝/ cm（2））。这表明，除通常建议的化学提示外，贻贝聚集体本身的复杂表面可能会引发同种异菌。我们强调，多形果蝇的群居性可能是进化的反捕食策略，而不是幼虫过度生产而争夺稀有底物的结果。

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