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首页> 外文期刊>Limnology >Predation and depth effects on abundance and size distribution of an invasive bivalve, the golden mussel Limnoperna fortunei, in a dam reservoir
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Predation and depth effects on abundance and size distribution of an invasive bivalve, the golden mussel Limnoperna fortunei, in a dam reservoir

机译：捕食和深度对大坝水库中入侵双壳类金蚌Limnoperna fortunei的丰度和大小分布的影响

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摘要

We investigated the predation and depth effects on abundance and size distribution of an invasive freshwater bivalve, Limnoperna fortunei, post-larvae using screened (5-, 25-, and 50-mm mesh openings) and unscreened cages at three depths (6, 12, and 1 m above the bottom) in a dam reservoir, Lake Ohshio of Japan. The densities of L. fortunei on the unscreened cages were much lower than those of the 5-mm mesh screened cages at any depth. The predation rates estimated by dividing the density of the unscreened cage by that of the 5-mm mesh screened cage were 97.3% at 6 m depth, 96.6% at 12 m depth, and 95.8% at the bottom. Shell lengths of L. fortunei post-larvae were small on bottom cages, and their size distribution was significantly different from those at other depths. These results suggest that predation and depth affected the abundance and size distribution of L. fortunei in the lentic environment. The impact of L. fortunei invasion on the food web and the possibility of regulating their population by predation pressures are also discussed.
机译：我们使用三种深度（6、12、5和12）的筛网（5、25和50毫米筛孔）和未筛网的笼子，研究了入侵性和深度对入侵性淡水双壳类动物Limnoperna fortunei，幼虫后的丰度和大小分布的影响，并在底部上方1 m处）位于日本大潮湖的水库中。在任何深度下，未经筛选的网箱中的L. fortunei密度均远低于5毫米筛网的网箱。通过将未筛网笼的密度除以5毫米网筛网笼的密度而得出的捕食率在6 m深度为97.3％，在12 m深度为96.6％，在底部为95.8％。在底部笼中，L。fortunei幼虫后壳的长度很小，并且其大小分布与其他深度的壳明显不同。这些结果表明，捕食和深度影响了在透镜状环境中福寿螺的丰度和大小分布。还讨论了Foresti（L. fortunei）入侵对食物网的影响以及通过捕食压力调节其种群的可能性。

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