PDF(Pubmed)
Abstract：
This study reveals early prey eating by a short-finned pilot whale (Globicephala macrorhynchus Gray, 1846, Cetacea: Delphinidae) in the Canary Islands. Stomach contents, trophic markers, skin isotopic ratios of nitrogen (δ15N:15N/14N) and carbon (δ13C:13C/12C), and fatty acid profiles of the blubber of a short-finned pilot whale of 213 cm size euthanized in free-ranging conditions were analyzed. A total of 15 species of oegopsid squids, mostly diel vertical mesopelagic migrant species of the families Enoploteuthidae, Ommastrephidae, and Histioteuthidae, as well as mother\'s milk, were identified in the stomach contents. Asperoteuthis acanthoderma (Lu, 1977, Cephalopoda: Chiroteuthidae) was found as first time in this area, suggesting the possibility of its presence on both sides of the subtropical Atlantic, extending its current known distribution. The δ15N value (11.55‰) was higher than expected based on the size range of squid ingested, but lower than that of adult pilot whales, suggesting that mother\'s milk intake has a significant effect on these values in calves. Similarly, the δ13C values (-17.99‰) were shifted to those of adult pilot whales rather than the ingested squids, also due to the ingestion of high-fat breast milk. The fatty acid (FA) composition of blubber showed a clear stratification. Long-chain polyunsaturated fatty acids (LC-PUFA) were mainly present in the inner layer, while most relevant ≤C20 monounsaturated fatty acids (MUFA) were more abundant in the outer layer.
摘要：
这项研究揭示了短鳍飞行员鲸（GlobicephalamacrorhynchusGray，1846年，鲸类：Delphinidae）在加那利群岛。胃内容物,营养标记，氮（δ15N：15N/14N）和碳（δ13C：13C/12C）的皮肤同位素比，分析了在自由范围条件下安乐死的213厘米大小的短鳍引航鲸的脂的脂肪酸谱。共有15种oegopsid鱿鱼，主要是Enoploteuthidae科的diel垂直中胚层迁徙物种，Ommastrephidae，和Histioteuthidae，以及母亲的牛奶，在胃内容物中被发现。杂色棘皮病（Lu，1977年，头足类：Chiroteuthidae）在该地区首次被发现，暗示着它在亚热带大西洋两岸的可能性，扩展其当前已知的分布。根据摄入的鱿鱼的大小范围，δ15N值（11.55‰）高于预期，但低于成年领航鲸，这表明母亲的牛奶摄入量对小牛的这些值有显著影响。同样，δ13C值（-17.99‰）转移到成年领航鲸而不是摄入的鱿鱼，也是由于摄入了高脂肪的母乳。脂肪的脂肪酸（FA）组成显示出明显的分层。长链多不饱和脂肪酸(LC-PUFA)主要存在于内层,而最相关的≤C20单不饱和脂肪酸（MUFA）在外层更丰富。
