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首页> 外文期刊>Marine ecology progress series >Feeding by Antarctic krill Euphausia superba in the West Antarctic Peninsula: differences between fjords and open waters
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Feeding by Antarctic krill Euphausia superba in the West Antarctic Peninsula: differences between fjords and open waters

机译：南极西部半岛的南极磷虾Euphausia superba喂养：峡湾和开阔水域之间的差异

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摘要

Antarctic krill Euphausia superba are key components of Antarctic ecosystems, serving as the major prey item for most of the megafauna in the region. Coastal fjords along the West Antarctic Peninsula have been identified as biological hotspots, areas in which high biomasses of both E. superba and their megafauna predators are consistently observed. We investigated feeding by E. superba in fjords and adjacent open waters of the West Antarctic Peninsula. Next generation sequencing of stomach contents from 174 krill indicated a diverse diet, with broad patterns consistent with previous understanding of E. superba feeding. Diatom sequence reads were frequent and abundant, indicating a largely diatom-based diet, while the occasional presence of high abundances of copepod sequence reads suggests carnivory supplemented the diet. Striking differences were observed between the stomach contents of krill collected in fjords and those of krill collected in adjacent open waters. Chaetoceros spp. diatoms made up 71 % of the stomach contents sequences of krill collected in fjords, but less than 10% of the stomach contents sequences of krill collected in open waters. These differences could not be explained by differences in the surface water phytoplankton communities, as in both open waters and fjords Chaetoceros spp. made up less than 10% of the surface water sequence read assemblages. These feeding differences highlight the importance of taking into account regional differences in krill feeding when considering E. superba's roles in Southern Ocean ecosystems, and suggest krill in fjords may make use of vertical structure in phytoplankton assemblages.
机译：南极磷虾Euphausia superba是南极生态系统的关键组成部分，是该地区大多数大型动物的主要猎物。南极西部半岛的沿海峡湾已被确定为生物热点地区，在该地区始终观察到超级大肠杆菌及其大型动物捕食者的高生物量。我们调查了南极洲峡湾和邻近开阔水域的超级大肠杆菌的摄食。来自174磷虾的胃内容物的下一代测序表明饮食多样化，且其广泛的模式与以前对超级大肠杆菌的了解相一致。硅藻序列读数频繁且丰富，表明很大程度上以硅藻为基础的饮食，而偶足co足类序列读数的偶尔出现也表明食肉动物为该饮食提供了补充。在峡湾收集的磷虾和邻近的开阔水域收集的磷虾的胃内容物之间观察到惊人的差异。 Chaetoceros spp。硅藻占峡湾收集的磷虾胃内容物序列的71％，但不到开阔水域收集的磷虾胃内容物序列的10％。不能像露天水域和峡湾Chaetoceros spp一样，用地表水浮游植物群落的差异来解释这些差异。所占比例不到地表水序列读数组合的10％。这些进食差异突显了在考虑南方大肠杆菌在南大洋生态系统中的作用时，应考虑到磷虾进食的区域差异，并暗示峡湾中的磷虾可能利用浮游植物组合中的垂直结构。

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