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首页> 外文期刊>Canadian Journal of Zoology >Combining stable isotope and intestinal parasite information to evaluate dietary differences between individual ringed seals (Phoca hispida botnica)
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Combining stable isotope and intestinal parasite information to evaluate dietary differences between individual ringed seals (Phoca hispida botnica)

机译：结合稳定的同位素和肠道寄生虫信息来评估单个环斑海豹（Phoca hispida botnica）之间的饮食差异

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摘要

The diet and foraging behaviour of nine individual Baltic ringed seals (Phoca hispida botnica Gmelin, 1785) in the Bothnian Bay were studied by combining results from stable isotope analyses (delta ~(13)C and delta ~(15)N) with data on intestinal parasites whose occurrence varied among the fish hosts. The patterns of infection with three acanthocephalan parasites, Corynosoma sememe (Forssell, 1904), Corynosoma magdaleni Montreuil, 1958, and Corynosoma strumosum (Rudolphi, 1802), and with a cestode larva, Schistocephalus solidus (Millier. 1776), were examined. The ringed seals become infected with these intestinal parasites by feeding on the fish hosts and hence have different parasite species and different parasite burdens according to their dietaryhistory. delta ~(13)C and delta ~(15)N) values were determined from diaphragm muscle of the seals and from tissues of potential prey items. A dual isotope plot of delta ~(13)C and delta ~(15)N) values for individual seals and mean values for key potential prey species, together with the parasitological data from the seals, allowed inferences to be drawn about the feeding of individual seals. It appeared that two seals foraged particularly on fourhorn sculpin (Myoxocephalus quadricor-nis (L., 1758)) andone seal consumed a high proportion of the isopod Saduria entomon (L., 1758). Three seals apparently preferred coastal benthic prey in their diets, while two other seals fed more on pelagic herring (Clupea harengiis membras L., 1761). One older female seal evidently also fed on salmon (Salmo salar L., 1758).
机译：通过将稳定同位素分析的结果（δ〜（13）C和δ〜（15）N）与有关数据相结合，研究了博特尼亚湾的9个波罗的海环海豹（Phoca hispida botnica Gmelin，1785）的饮食和觅食行为。在鱼宿主之间发生变化的肠道寄生虫。检查了三种棘头虫寄生虫的感染模式，即粘液棒状藻（Forssell，1904），马格达莱尼·蒙特勒伊（Corynosoma magdaleni Montreuil）（1958）和Strynosum strumosum（Rudolphi，1802），以及est虫（Sistocephalus solidus（Millier.1776））。环状海豹通过以鱼为食，被这些肠道寄生虫感染，因此根据它们的饮食历史，它们具有不同的寄生虫种类和不同的寄生虫负担。从海豹的diaphragm肌和潜在猎物的组织确定δ〜（13）C和δ〜（15）N）值。单个海豹的δ〜（13）C和δ〜（15）N）值以及关键潜在猎物物种的平均值的双重同位素图，以及海豹的寄生虫学数据，可以得出关于捕食海豹的信息。单个密封件。似乎有两只海豹特别在四角（Myoxocephalus quadricor-nis（L.，1758））上觅食，一个海豹消耗了等比例的Sadouria entomon（L.，1758）。三个海豹显然在饮食上更喜欢沿海底栖动物，而另外两个海豹则以中上层鲱鱼为食（Clupea harengiis membras L.，1761）。一只年长的雌海豹显然也以鲑鱼为食（Salmo salar L.，1758）。

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