Exploring variability in the diet of depredating sperm whales in the Gulf of Alaska through stable isotope analysis.
Exploring variability in the diet of depredating sperm whales in the Gulf of Alaska through stable isotope analysis.
复制标题
通过稳定同位素分析探索阿拉斯加湾捕食抹香鲸饮食的变化。
DOI：
10.1098/rsos.191110
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发表时间：
2020
影响因子：
3.5
通讯作者：
Straley,JaniceM
中科院分区：
文献类型：
--
作者：
Wild,LaurenA;Mueter,Franz;Witteveen,Briana;Straley,JaniceM
抹香鲸与阿拉斯加湾（果阿）近海具有重要商业价值的底栖鱼类渔业相互作用。本研究的目的是使用稳定同位素分析，以更好地了解抹香鲸及其潜在猎物的营养变异，并使用饮食混合模型来估计猎物物种的重要性抹香鲸饮食。我们分析了抹香鲸和七个潜在的猎物（五个底栖鱼和两个鱿鱼物种）的组织样本。对样品进行了稳定的碳和氮同位素比值分析，并使用贝叶斯同位素混合模型估计饮食组成。混合模型的结果表明，同位素结合的sablefish/角鲨组，冰鞋和rockfish构成抹香鲸饮食的最大比例（35%，28%和12%）在果阿。与渔船互动更频繁的鲸鱼的顶级猎物包括冰鞋（49%）和黑鲈/角鲨组（24%）。这是已知的第一项研究，提供了成年雄性抹香鲸和这些成年底栖鱼和近海鱿鱼物种的同位素基线，并分配了猎物对果阿鲸鱼饮食的贡献。这项研究为商业渔民和渔业管理人员提供了信息，以更好地了解重要商业物种的营养关系。
Sperm whales interact with commercially important groundfish fisheries offshore in the Gulf of Alaska (GOA). This study aims to use stable isotope analysis to better understand the trophic variability of sperm whales and their potential prey, and to use dietary mixing models to estimate the importance of prey species to sperm whale diets. We analysed tissue samples from sperm whales and seven potential prey (five groundfish and two squid species). Samples were analysed for stable carbon and nitrogen isotope ratios, and diet composition was estimated using Bayesian isotopic mixing models. Mixing model results suggest that an isotopically combined sablefish/dogfish group, skates and rockfish make up the largest proportion of sperm whale diets (35%, 28% and 12%) in the GOA. The top prey items of whales that interact more frequently with fishing vessels consisted of skates (49%) and the sablefish/dogfish group (24%). This is the first known study to provide an isotopic baseline of adult male sperm whales and these adult groundfish and offshore squid species, and to assign contributions of prey to whale diets in the GOA. This study provides information to commercial fishermen and fisheries managers to better understand trophic connections of important commercial species.