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首页> 外文期刊>Marine biology >Feeding Current Characteristics Of Three Morphologically Different Bivalve Suspension Feeders, Crassostrea Gigas, Mytilus Edulis And Cerastoderma Edule, In Relation To Food Competition
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Feeding Current Characteristics Of Three Morphologically Different Bivalve Suspension Feeders, Crassostrea Gigas, Mytilus Edulis And Cerastoderma Edule, In Relation To Food Competition

机译：与食物竞争有关的三种形态各异的双壳类悬浮饲料，Crassostrea Gigas，Mytilus Edulis和Cerastoderma Edule的进食电流特性

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Introduced Pacific oysters (Crassostrea gigas) have shown rapid expansion in the Oosterschelde estuary, while stocks of native bivalves declined slightly or remained stable. This indicates that they might have an advantage over native bivalve filter feeders. Hence, at the scale of individual bivalves, we studied whether this advantage occurs in optimizing food intake over native bivalves. We investigated feeding current characteristics, in which potential differences may ultimately lead to a differential food intake. We compared feeding currents of the invasive epibenthic non-siphonate Pacific oyster to those of two native bivalve suspension feeders: the epibenthic siphonate blue mussel Mytilus edulis and the endobenthic siphonate common cockle Cerastoderma edule. Inhalant flow fields were studied empirically using digital particle image velocimetry and particle tracking velocimetry. Exhalant jet speeds were modelled for a range of exhalant-aperture cross-sectional areas as determined in the laboratory and a range of filtration rates derived from literature. Significant differences were found in inhalant and exhalant current velocities and properties of the inhalant flow field (acceleration and distance of influence). At comparable body weight, inhalant current velocities were lower in C. gigas than in the other species. Modelled exhalant jets were higher in C. gigas, but oriented horizontally instead of vertically as in the other species. Despite these significant differences and apparent morphological differences between the three species, absolute differences in feeding current characteristics were small and are not expected to lead to significant differences in feeding efficiency.
机译：引进的太平洋牡蛎（Crassostrea gigas）已在Oosterschelde河口迅速扩张，而本地双壳类鱼类的数量则略有下降或保持稳定。这表明它们可能比本地双阀过滤器进料器具有优势。因此，在单个双壳贝类的规模上，我们研究了这种优势是否优于天然双壳贝类在优化食物摄入方面出现。我们调查了进食电流特征，其中潜在的差异最终可能导致食物摄入差异。我们将侵入性表皮非虹吸管太平洋牡蛎的摄食电流与两个本地双壳类悬浮喂食器的馈电电流进行了比较：表皮虹吸蓝贻贝Mytilus edulis和内膜虹吸管普通蛤C Cerastoderma edule。使用数字颗粒图像测速仪和颗粒跟踪测速仪对吸入流场进行了经验研究。针对实验室确定的一系列呼气孔横截面积和一系列从文献中得出的过滤速率，对呼气喷射速度进行建模。吸入和呼出气流的速度和吸入流场的性质（加速度和影响距离）存在显着差异。在相当的体重下，C。gigas的吸入流速度低于其他物种。在C. gigas中，模拟的呼气喷射器较高，但水平定向而不是其他物种中的垂直定向。尽管这三个物种之间存在这些显着差异和明显的形态差异，但馈电电流特性的绝对差异很小，并且预计不会导致馈电效率的显着差异。

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