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首页> 外文期刊>Polar biology >Recent summer diet of hooded Cystophora cristata and harp Pagophilus groenlandicus seals in the drift ice of the Greenland Sea
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Recent summer diet of hooded Cystophora cristata and harp Pagophilus groenlandicus seals in the drift ice of the Greenland Sea

机译：最近夏季格陵兰海流冰中带帽的Cystophora cristata和竖琴Pagophilus groenlandicus海豹的饮食

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摘要

Harp Pagophilus groenlandicus and hooded Cystophora cristata seals are important predators in drift ice areas of the Greenland Sea (the West Ice) during spring and summer. Their summer (June-July) diet was studied in the West Ice in 2008 and 2010, based on analysis of the gastrointestinal contents of 179 and 20 hooded and harp seals, respectively, in addition to 70 harp seal faeces samples. The diet compositions of harp and hooded seals deviated significantly from each other, implying that the degree of food competition was relatively low. Polar cod Boreogadus saida dominated the hooded seal diet and amphipods (mostly Themisto sp.) dominated the harp seal diet. Krill and the squid Gonatus fabricii were eaten by both species. The importance of G. fabricii for hooded seals was lower in this study compared with previous studies, and krill only occurred sparsely. The occurrence of polar cod, Themisto sp. and krill in the diets of the two seal species coincides well with the geographical and vertical distribution of these three prey items and the previously recorded dive depths of the seals. The inclusion of demersal fishes such as sculpins and snailfish in the diet of some hooded seals was more likely a result of increased availability rather than changes in prey preference, as these seals were collected above shallower waters. Both species showed a rather narrow niche breadth.
机译：在春季和夏季，竖琴Pagophilus groenlandicus和带帽的Cystophora cristata海豹是格陵兰海（西冰）流冰地区的重要捕食者。在分析了179只和20只带帽和竖琴海豹的肠胃内容物以及70个竖琴海豹粪便样本后，在2008年和2010年的西冰区研究了他们夏季（6月至7月）的饮食。竖琴和带帽海豹的饮食组成彼此明显不同，这表明食物竞争的程度相对较低。极地鳕鱼Boreogadus说a主导了带帽海豹的饮食，两栖动物（主要是Themisto sp。）主导了竖琴海豹的饮食。两种物种都食用磷虾和鱿鱼Gonatus fabricii。与以前的研究相比，本研究中G. fabricii对带帽海豹的重要性较低，磷虾仅很少发生。极性鳕鱼Themisto sp。的发生。这两种海豹的饮食中的磷虾和磷虾与这三个猎物的地理和垂直分布以及海豹先前记录的潜水深度非常吻合。在某些带帽海豹的日粮中添加了诸如fish鱼和fish鱼之类的沉鱼，这很可能是由于可获得性增加而不是猎物偏好的变化所致，因为这些海豹是在浅水区上方收集的。两种物种的利基宽度都很窄。

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