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首页> 外文期刊>Hydrobiologia >Native fish larvae take advantage of introduced mussel larvae: field evidence of feeding preferences on veligers of the introduced freshwater bivalve Limnoperna fortunei
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Native fish larvae take advantage of introduced mussel larvae: field evidence of feeding preferences on veligers of the introduced freshwater bivalve Limnoperna fortunei

机译：本地鱼类幼虫利用了引进的贻贝幼虫的优势：现场证据表明，引进的淡水双壳双壳Li（Limnoperna fortunei）的捕食者喜欢

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Previous work has shown that the invasive bivalve Limnoperna fortunei has had a measurable impact on local food webs, but knowledge of the trophic interactions involved is still very limited. On the basis of samples collected along the lower Paraguay-middle Parana rivers, we studied the feeding behavior and selectivity of larval fish, with emphasis on veligers of the introduced bivalve L. fortunei. Among feeding larvae (i.e., without a yolk sac), 16.5% had only Limnoperna veligers in their guts, while 15.6% had veligers and some other prey. Half of the fish taxa recorded (8 out of a total of 16) consumed Limnoperna veligers. The Paraguay and Parana rivers differed strongly in the proportions of fish larvae that consumed veligers: 14 and 68%, respectively. This difference paralleled the availability of veligers in the water column, which was significantly lower in the Paraguay (0.8 +/- A 0.5 ind. l(-1)) than in the Parana River (5.5 +/- A 2.3 ind. l(-1)). Conversely, cladocerans, originally the staple food of fish larvae, were more abundant in the Paraguay (consumed by 48% of the individuals) than in the Parana River (26%). These results indicate that, when widely available, Limnoperna veligers largely replace the original prey of fish larvae, especially in their younger stages (protolarvae).
机译：先前的工作表明，入侵性双壳类的Limnoperna fortunei对当地食物网产生了可观的影响，但有关营养相互作用的知识仍然非常有限。根据沿巴拉圭中下游巴拉那河收集的样本，我们研究了幼体鱼的摄食行为和选择性，并重点介绍了引入的双壳LL。fortunei。在喂食幼虫（即没有卵黄囊）的幼虫中，只有16.5％的雌性有淋巴小肠虫，而有15.6％的有小虫和其他猎物。记录的鱼类类目中有一半（总共16种中的8种）消耗了Limnoperna veligers。巴拉圭河和巴拉那河的食用幼虫的鱼幼体比例差异很大：分别为14％和68％。这种差异与水柱中的香根草的可利用性平行，在巴拉圭（0.8 +/- A 0.5 ind。l（-1））明显低于在巴拉那河（5.5 +/- A 2.3 ind。l（ -1））。相反，巴拉圭人（最初是鱼幼虫的主食）在巴拉圭（由48％的人消费）比巴拉那河（26％）要丰富。这些结果表明，当Limnoperna捕食者广泛使用时，它们在很大程度上取代了鱼幼虫的原始猎物，尤其是在其幼龄阶段（原虫）。

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