Trophic interactions of macro-zooplankton (krill and amphipods) in the Marginal Ice Zone of the Barents Sea
Trophic interactions of macro-zooplankton (krill and amphipods) in the Marginal Ice Zone of the Barents Sea
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DOI：
10.1016/j.dsr2.2008.05.016
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发表时间：
2008-10-01
影响因子：
3
通讯作者：
Johannessen, Signe
中科院分区：
文献类型：
--
作者：
Dalpadado, Padmini;Yamaguchi, Atsushi;Johannessen, Signe
2004年至2005年，在巴伦支海西北部边缘冰区、斯匹次卑尔根以北和以东的野外采集标本上，用光学显微镜观察了磷虾和角足类的食性。胃内容物分析表明，优势磷虾物种具有滤食模式，而两足类似乎主要是食肉猛禽。占主导地位的磷虾Thysanoessa inermis主要被认为是一种主要以硅藻为食的食草动物。或者，Thysanoessa Longicaudata除了是浮游植物的悬浮摄食者外，还偶尔捕食尺足类水蚤。最大的磷虾种类是褐磷虾，表现为混合食性，定期摄食甲龙类桡足类和浮游植物。不同站点的肉食性程度不同，通过检查桡足类下颌骨的大小和形状来确定。褐家鼠全长26~41 mm，胃内最多有2个桡足类，其下颌宽为32~154亩m，分别相当于推算的0.3 mm和2.6 mm。食草性和杂食性猎物，如桡足类和附肢动物。Metridia spp.的存在而附肢动物，如海鞘中的Oikopleura vanhoeffeni，可能表示在更深的层(>；200米)摄食。(C)2008爱思唯尔有限公司。保留所有权利。
The diets of krill and amphipods were examined using light microscopy on field-collected specimens from 2004 to 2005 from the Marginal Ice Zone of the northwestern Barents Sea, north and east of Spitsbergen. Stomach content analyses indicate dominant krill species to have a filter-feeding mode, whereas amphipods seem to be mainly raptorial feeders. The dominant krill, Thysanoessa inermis, is primarily regarded as an herbivore feeding mostly on diatoms. Alternatively, Thysanoessa longicaudata fed occasionally on calanoid copepods in addition to being a suspension feeder on phytoplankton. The largest of the krill species, Meganyctiphanes norvegica, showed a mixed diet with regular feeding on calanoid copepods and phytoplankton.The degree of carnivory varied between stations and was determined by examining the size and shape of the mandible of copepods. M. norvegica, with a total length of between 26 and 41 mm, had up to two copepods in their stomachs, with a mandible width of the copepods varying from 32 to 154 mu m, corresponding, respectively, to a computed prosome length of 0.3 and 2.6 mm, Themisto libellula fed primarily on C3 and C4 copepodite stages of Calanus glacialis and Calanus hyperboreus, and up to three copepods were found in the stomach contents of T libellula. Themisto abyssorum fed on herbivorous and omnivorous prey such as copepods and appendicularians. The presence of Metridia spp. and appendicularians, e.g., Oikopleura vanhoeffeni in the diet of T abyssorum may indicate feeding in the deeper layers (>200 m). (C) 2008 Elsevier Ltd. All rights reserved.