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首页> 外文期刊>Marine ecology >Food web structure within kelp holdfasts (Laminaha): a stable isotope study
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Food web structure within kelp holdfasts (Laminaha): a stable isotope study

机译：海带固定食物中的食物网结构（Laminaha）：稳定的同位素研究

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摘要

Kelp holdfasts are highly reticulated structures which host a large diversity of small fauna. These microhabitats have been reported to play a crucial role in the biodiversity associated to kelp forest ecosystems. This study aimed at identifying trophic links and the main food sources sustaining food webs within communities associated with kelp holdfasts, through a stable isotope (δ~(13)C and δ~(15)N) approach. Sampling of the main invertebrates inhabiting Laminaria digitata holdfasts, and of their potential food sources, took place in February and May 2007. Stable isotope results reveal that most of the primary consumers, including filter-feeders and deposit-feeders, rely on the particulate organic matter sedimented within kelp holdfasts. Only three grazers departed from this general pattern. The correspondence between the stable isotope ratios of predators and sediment consumers indicated that this source is at the base of the main pathway through which energy and matter transit in the food web. δ~(15)N ranges found for consumers revealed that the food web associated with kelp holdfasts is composed of 3.5 levels. In spite of the low diversity of food sources at the base of the food web, these microhabitats can therefore be considered micro-scale ecosystems, from a functional perspective.
机译：海带固定装置是高度网状的结构，可容纳多种多样的小型动物。据报道，这些微生境在与海带森林生态系统有关的生物多样性中起着至关重要的作用。这项研究旨在通过稳定的同位素（δ〜（13）C和δ〜（15）N）方法确定与海带禁食相关的社区中的营养联系和维持食物网的主要食物来源。 2007年2月和2007年5月对居住在指状海带上的主要无脊椎动物及其潜在食物进行了采样。稳定的同位素结果表明，大多数主要消费者（包括滤食者和沉积物食者）都依赖于颗粒状有机物。海带固着物中沉积的物质。只有三个放牧者偏离了这种一般模式。捕食者与沉积物消费者的稳定同位素比之间的对应关系表明，该来源是食物网中能量和物质通过其传递的主要途径的基础。消费者发现的δ〜（15）N范围表明，与海带坚牢相关的食物网由3.5种含量组成。尽管食物网基础上的食物来源多样性较低，但从功能的角度来看，这些微型栖息地仍可被视为微型生态系统。

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  • 来源
    《Marine ecology》 |2012年第3期|p.370-376|共7页
  • 作者

    Gauthier Schaal; Pascal Riera; Cedric Leroux;

  • 作者单位

    Department of Zoology and Entomology, PO Box 94, Rhodes University, Grahamstown, 6140 South Africa,UPMC Univ Paris 06, Station Biologique de Roscoff, Roscoff, France,CNRS, UMR 7144 AD2M, Roscoff, France;

    UPMC Univ Paris 06, Station Biologique de Roscoff, Roscoff, France,CNRS, UMR 7144 AD2M, Roscoff, France;

    UPMC Univ Paris 06, Station Biologique de Roscoff, Roscoff, France,CNRS, FR 2424, Roscoff, France;

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  • 原文格式 PDF
  • 正文语种 eng
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  • 关键词

    brown algae; food web; kelp holdfast; sediment organic matter; stable isotopes;

    机译：褐藻食物网;海带坚牢;沉积有机物稳定同位素;

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