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首页> 外文期刊>Limnology >Feeding selectivity of the invasive mussel Limnoperna fortunei (Dunker, 1857) on a natural phytoplankton assemblage: what really matters?
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Feeding selectivity of the invasive mussel Limnoperna fortunei (Dunker, 1857) on a natural phytoplankton assemblage: what really matters?

机译：侵入性贻贝Limnoperna fortunei（Dunker，1857）在天然浮游植物组合上的进食选择性：真正重要的是什么？

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The aims of this work were to analyse the feeding selectivity of L. fortunei in a natural assemblage of phytoplankton in a short-term microcosm experiment and to assess whether this selectivity is affected by the presence of Rotifera as a secondary, palatable feeding resource. This bivalve preferred Desmidiales, Chlorococcales, Euglenophyceae and Chrysophyceae algae with a maximum linear dimension from 20 to 100 A mu m. Organisms between 500 and 40 x 10(3) A mu m(3) belonging to Desmidiales, Chrysophyceae and Euglenophyceae were also positively selected. Volvocales, Cryptophyceae and one group of medium-size Euglenophyceae (Trachelomonas sp.) had a high, negative selectivity index independent of their cell shape or size (Ivlev's index of feeding selectivity <-0.7). The mussel positively selected Rotifera, and this only had a measurable effect on large Euglenophyceae, which increase their selectivity value in the absence of Rotifera. The non-parametric multiplicative regression showed that selectivity is largely explained by a combination of cell shape, biovolume and the phytoplankton taxa offered (R (2) > 0.8). We concluded that the impact on phytoplankton community structure could be severe, considering that the presence of zooplankton does not have an effect on the majority of phytoplankton groups and that the mussel tends to feed on both items to improve its diet. The negative selection of some phytoplankton taxa is possibly related to the morpho-physiological characteristics of their cell shells.
机译：这项工作的目的是在短期的微观实验中分析天然浮游植物组合中的福氏乳杆菌的摄食选择性，并评估轮虫作为次生可口的摄食资源的存在是否会影响该选择性。该双壳类优选具有最大线性尺寸为20至100μm的Desmidiales，绿球菌，裸藻科和金藻科藻类。还积极选择了500至40 x 10（3）属于Desmidiales，Chrysophyceae和Euglenophyceae的mu m（3）生物。 Volvocales，隐藻科和一组中等大小的裸藻科（Trachelomonas sp。）具有较高的负选择性指数，而与它们的细胞形状或大小无关（Ivlev的摄食选择性指数<-0.7）。贻贝肯定地选择了轮虫，而这只对大型裸藻科具有可测量的作用，在没有轮虫的情况下，其选择性增加。非参数乘法回归表明，选择性在很大程度上由细胞形状，生物量和浮游植物分类群的组合解释（R（2）> 0.8）。我们得出的结论是，考虑到浮游动物的存在不会对大多数浮游植物群体产生影响，并且贻贝倾向于以这两种食物为食来改善其饮食，因此对浮游植物群落结构的影响可能很严重。某些浮游植物类群的阴性选择可能与其细胞壳的形态生理特征有关。

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