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首页> 外文期刊>Marine biology >A three-isotope approach to disentangling the diet of a generalist consumer: the yellow-legged gull in northwest Spain
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A three-isotope approach to disentangling the diet of a generalist consumer: the yellow-legged gull in northwest Spain

机译：区分普通消费者饮食的三种同位素方法：西班牙西北部的黄腿鸥

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摘要

The widespread omnivory of consumers and the trophic complexity of marine ecosystems make it difficult to infer the feeding ecology of species. The use of stable isotopic analysis plays a crucial role in elucidating trophic interactions. Here we analysed δ~(15)N, δ~(13)C and δ~(34)S in chick feathers, and we used a Bayesian triple-isotope mixing model to reconstruct the diet of a generalist predator, the yellow-legged gull (Lams michahellis) that breeds in the coastal upwelling area off northwest mainland Spain. The mixing model indicated that although chicks from all colonies were fed with a high percentage of fish, there are geographical differences in their diets. While chicks from northern colonies consume higher percentages ofrnearthworms, refuse constitutes a more important source in the diet of chicks from western colonies. The three-isotope mixing model revealed a heterogeneity in foraging habitats that would not have been apparent if only two stable isotopes had been analysed. Moreover, our work highlights the potential of adding δ~(34)S for distinguishing not only between terrestrial and marine prey, but also between different marine species such as fish, crabs and mussels.
机译：消费者的无所事事和海洋生态系统的营养复杂性使得难以推断物种的摄食生态。稳定同位素分析的使用在阐明营养相互作用中起着至关重要的作用。在这里，我们分析了鸡羽毛中的δ〜（15）N，δ〜（13）C和δ〜（34）S，并使用贝叶斯三重同位素混合模型重建了通体捕食者黄腿的饮食海鸥（Lams michahellis）在西班牙西北部沿海的上升流地区繁殖。混合模型表明，尽管所有殖民地的雏鸡都喂了高百分比的鱼，但它们的饮食却存在地域差异。尽管北部殖民地的雏鸡消耗较高的黑蠕虫百分比，但垃圾是西部殖民地雏鸡饮食中更重要的来源。三同位素混合模型揭示了觅食生境中的异质性，如果仅分析了两个稳定的同位素就不会很明显。此外，我们的工作突出了添加δ〜（34）S的潜力，不仅可以区分陆地和海洋猎物，而且还可以区分不同的海洋物种，例如鱼类，螃蟹和贻贝。

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  • 来源
    《Marine biology》 |2010年第3期|545-553|共9页
  • 作者

    Rocio Moreno; Lluis Jover; Ignacio Munilla; Alberto Velando; Carola Sanpera;

  • 作者单位

    Departament Biologia Animal (Vertebrats), Facultat de Biologia, Universitat de Barcelona, Avgda. Diagonal 645, 08028 Barcelona, Spain;

    rnDepartament Salut Publica, Facultat de Medicina, Universitat de Barcelona, Casanova 143, 08036 Barcelona, Spain;

    rnDepartamento de Botanica, Facultade de Farmacia, Universidade de Santiago de Compostela, Campus Sur, 15782 Santiago de Compostela, Galicia, Spain;

    rnDepartamento Ecoloxia e Bioloxia Animal, Facultade de Ciencias, Universidade de Vigo, 36310 Vigo, Galicia, Spain;

    rnDepartament Biologia Animal (Vertebrats), Facultat de Biologia, Universitat de Barcelona, Avgda. Diagonal 645, 08028 Barcelona, Spain;

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