The diet of Weddell seals in McMurdo Sound, Antarctica as determined from scat collections and stable isotope analysis
The diet of Weddell seals in McMurdo Sound, Antarctica as determined from scat collections and stable isotope analysis
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DOI：
10.1007/s003000050245
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发表时间：
1998-04-01
期刊：
影响因子：
1.7
通讯作者：
Testa, JW
中科院分区：
文献类型：
--
作者：
Burns, JM;Trumble, SJ;Testa, JW
通过对南极洲麦克默多海峡成年和幼年韦德尔海豹(Leptonychotes Wedellii)的座椅和稳定同位素分析，确定觅食行为是否随年龄、季节或潜水模式的变化而变化。6年来收集了座椅，并发现了坚硬的部件。测定了海豹血液样本和潜在猎物物品的稳定碳和氮同位素值，并用于识别主要猎物种类和评估营养相互作用。从70%到100%的座位上找到了南极星天牛的遗骸，几乎没有证据表明觅食行为存在年际或年龄差异。然而，稳定同位素和潜水数据分析表明，虽然大多数海豹主要捕食中上层鱼类和鱿鱼，但一些幼海豹集中在浅水底栖吸虫spp.将这三种方法结合起来，他就可以得出关于饮食和觅食行为的结论。
The diet of adult and juvenile Weddell seals (Leptonychotes weddellii) in McMurdo Sound, Antarctica, was determined from both seat and stable isotope analyses, to ascertain if foraging behavior varied with age, season, or diving pattern. Seats were collected over 6 years and recovered hard parts identified. Stable carbon and nitrogen isotope values were determined for seal blood samples and potential prey items and used to identify primary prey species and assess trophic interactions. Pleuragramma antarcticum remains were recovered from between 70 and 100% of the seats, and there was little evidence for inter-annual or age-specific variation in foraging behavior. However, stable isotope and dive data analyses indicated that while most seals foraged predominantly on pelagic fish and squid, some juveniles concentrated on shallow benthic Trematomus spp. Combining these three methods permitted him conclusions about diet and foraging behavior to be drawn.