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首页> 美国卫生研究院文献>Biology Letters >Whisker isotopic signature depicts migration patterns and multi-year intra- and inter-individual foraging strategies in fur seals
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Whisker isotopic signature depicts migration patterns and multi-year intra- and inter-individual foraging strategies in fur seals

机译：晶须同位素特征描述了海狗的迁徙模式和多年内个体间觅食策略

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摘要

The movement and dietary history of individuals can be studied using stable isotope records in archival keratinous tissues. Here, we present a chronology of temporally fine-scale data on the trophic niche of otariid seals by measuring the isotopic signature of serially sampled whiskers. Whiskers of male Antarctic fur seals breeding at the Crozet Islands showed synchronous and regular oscillations in both their δ13C and δ15N values that are likely to represent their annual migrations over the long term (mean 4.8 years). At the population level, male Antarctic fur seals showed substantial variation in both δ13C and δ15N values, occupying nearly all the ‘isotopic space’ created by the diversity of potential oceanic habitats (from high Antarctica to the subtropics) and prey (from Antarctic krill to subantarctic and subtropical mesopelagic fishes). At the individual level, whisker isotopic signatures depict a large diversity of foraging strategies. Some seals remained in either subantarctic or Antarctic waters, while the migratory cycle of most animals encompassed a wide latitudinal gradient where they fed on different prey. The isotopic signature of whiskers, therefore, revealed new multi-year foraging strategies of male Antarctic fur seals and is a powerful tool for investigating the ecological niche during cryptic stages of mammals' life.
机译：可以使用档案角质组织中的稳定同位素记录来研究个体的运动和饮食史。在这里，我们通过测量连续采样的晶须的同位素特征，介绍了OTARIID海豹营养小生境的时间精细数据的时间顺序。克罗泽群岛上繁殖的南极海狗雄性胡须显示出δ 13 C和δ 15 N值的同步且有规律的振荡，这很可能代表了它们每年的迁徙。长期（平均4.8年）。在种群水平上，雄性南极海狗显示δ 13 C和δ 15 N值均存在较大变化，几乎占据了由潜在的海洋栖息地（从南极洲到亚热带）和猎物（从南极磷虾到亚南极和亚热带中生鱼类）。在个体层面上，晶须同位素特征描述了多种觅食策略。在南极或南极水域中仍留有一些海豹，而大多数动物的迁徙周期包括宽纬度梯度，它们以不同的猎物为食。因此，晶须的同位素特征揭示了雄性南极海豹的多年觅食新策略，并且是研究哺乳动物生命中秘密阶段生态位的有力工具。

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