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首页> 外文期刊>Estuarine Coastal and Shelf Science >Isotopic evidence for zooplankton as an important food source for the mysid Paramysis lacustris in the Curonian Lagoon, the South-Eastern Baltic Sea
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Isotopic evidence for zooplankton as an important food source for the mysid Paramysis lacustris in the Curonian Lagoon, the South-Eastern Baltic Sea

机译：浮游动物是东南波罗的海库尔斯沙嘴泻湖中Mysid Paramysis lacustris的重要食物来源的同位素证据

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摘要

To evaluate the contribution of mesozooplankton to the diet of a coastal mysid Paramysis lacustris in the Curonian Lagoon, stable isotope analysis of mysids and mesozooplankton was conducted from July to October 2004. Nitrogen isotopic composition (δ~(15)N) of both mysid bodies and dissected stomachs was analyzed and their δ~(15)N values were compared to those in ambient mesozooplankton. We also evaluated changes in phyto- and mesozooplankton assemblages during the study period and related the community dominance structure to the isotopic composition of the mesozooplankton and mysids. Stable isotope data suggest that during the ontogenetic development, mysid diet changes to include a larger proportion of mesozooplankton and that mysids need to attain a threshold size of 8.7 ± 0.7 mm to feed on mesozooplankton. In adult mysids, δ~(15)N values of the dissected stomachs and stomach content were indistinguishable from those of ambient mesozooplankton, indicating nearly complete reliance on mesozooplankton prey. A significant depletion of ~(15)N in both mesozooplankton and mysids occurred during the study period, correlating with cyanobacteria abundance in the lagoon. These findings contribute to the understanding of P. lacustris' feeding biology, and the pelagic food web structure and functioning in the coastal environment.
机译：为了评估中型浮游动物对库尔斯沙嘴泻湖中海岸型Mysid副寄生菌的饮食的贡献，于2004年7月至10月对中型浮游动物和中型浮游动物进行了同位素分析。解剖胃并比较其δ〜（15）N值与周围中层浮游动物的δ〜（15）N值。我们还评估了研究期间植物-中层浮游动物组合的变化，并将群落优势结构与中层浮游生物和类鲨鱼的同位素组成相关。稳定的同位素数据表明，在个体发育过程中，类s蛇饮食改变为包含较大比例的中oz鱼，并且类s蛇必须达到8.7±0.7 mm的阈值大小才能以中oz鱼为食。在成年蝇类中，解剖的胃的δ〜（15）N值和胃内容物与周围的中层浮游动物没有区别，表明它们几乎完全依赖中层浮游动物的猎物。在研究期间，中型浮游动物和类腮腺中的〜（15）N大量消耗，与泻湖中的蓝细菌丰度相关。这些发现有助于了解P. lacustris的摄食生物学，以及在沿海环境中上层食物网的结构和功能。

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