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首页> 外文期刊>Marine ecology progress series >Regional differences in foraging of young-of-the-year Steller sea lions Eumetopias jubatus in Alaska: stable carbon and nitrogen isotope ratios in blood
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Regional differences in foraging of young-of-the-year Steller sea lions Eumetopias jubatus in Alaska: stable carbon and nitrogen isotope ratios in blood

机译：阿拉斯加年幼斯特勒海狮Eumetopias jubatus觅食的区域差异：血液中稳定的碳和氮同位素比

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摘要

Stable nitrogen and carbon isotope ratios were measured from red blood cell (RBC) and serum components from 9 mo old Steller sea lions Eumetopias jubatus captured during February and March 2000 and 2001 from the Gulf of Alaska (GOA; Region 1, n = 11), the eastern Aleutian Islands (Region 3, n = 5), and the central Aleutian Islands (Region 4, n = 5) to assess their foraging ecology. Isotope ratios from sea lions were compared with those from probable prey species and results were compared with those from a study demonstrating regional differences in the diets of juvenile and adult sea lions through the use of scat analysis. Discriminant analyses using the δ ~(15)N and δ ~(13)C values of each blood component as the discriminant functions accurately classified sea lions to the appropriate foraging regions as predicted by a previous study employing scat analysis with an accuracy of 90% for serum and 95% for RBCs. The δ ~(15)N values reflect a decrease in sea lion trophic position moving east to west that is probably driven by changes in sea lion diet. The δ ~(13)C values demonstrated clear distinctions between foraging locations that are likely driven by known geographic carbon isotope patterns observed in the GOA and along the Aleutian archipelago. Our data present further evidence that, in the marine environment, δ ~(13)C values do not covary with δ ~(15)N values as a result of trophic enrichment, and are better determinants of foraging location than trophic position.
机译：从2000年2月，2000年3月和2001年于阿拉斯加湾捕获的9个月大的斯特勒海狮Eumetopias jubatus的红细胞（RBC）和血清成分中测得稳定的氮和碳同位素比（GOA； 1区，n = 11） ，阿留申群岛东部（3区，n = 5）和阿留申群岛中部（4区，n = 5）以评估其觅食生态。将海狮的同位素比率与可能的猎物物种的同位素比率进行了比较，并将结果与​​一项研究进行了比较，该研究通过使用粪便分析显示了幼狮和成年海狮饮食的区域差异。判别分析使用每个血液成分的δ〜（15）N和δ〜（13）C值作为判别函数，如先前研究使用scat分析所预测的那样，将海狮准确地分类到适当的觅食区域，准确度为90％用于血清，95％用于红细胞。 δ〜（15）N值反映了海狮营养位置从东向西移动的减少，这可能是由于海狮饮食结构的变化所致。 δ〜（13）C值显示出觅食位置之间的明显区别，这可能是由在GOA中和沿阿留申群岛观察到的已知地理碳同位素分布所驱动的。我们的数据进一步证明，在海洋环境中，由于营养富集，δ〜（13）C值不会与δ〜（15）N值共存，并且比营养位置更好地决定了觅食位置。

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