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Microscale variations of food web functioning within a rocky shore invertebrate community

机译：岩石海岸无脊椎动物群落中食物网功能的微观变化

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The assessment of relevant spatial scales at which ecological processes occur is of special importance for a thorough understanding of ecosystem functioning. In coastal ecosystems, the variability of trophic interactions has been studied at different spatial scales, but never at scales from centimetres to metres. In the present study, we investigated the link between habitat structure and small-scale variability of food web functioning on intertidal boulder field ecosystems. Two microhabitats, boulder-top and boulder-bottom, were considered, and the trophic ecology of invertebrate consumers was studied using stable isotope tracers. We found for two of the main suspension feeders of northern Atlantic rocky shores (the sponges Halichondria panicea and Hymeniacidon sanguined) consistent ~(15)N enrichment for individuals sampled under boulders, suggesting that these consumers relied on different trophic resource according to the microhabitat inhabited, at a centimetre scale. The high 鋨(15)N signatures found underneath boulders suggested higher use of highly decomposed organic matter in this microhabitat. The iso-topic difference between the two microhabitats decreased in higher trophic level consumers, which likely foraged at a spatial scale including both microhabitats. Finally, our results reveal that in highly heterogeneous habitats such as boulder fields, trophic interactions are likely to vary strongly in space, which should be considered in future researches. The link between habitat physical structure and food web variability might also contribute to the high biological diversity characterizing heterogeneous ecosystems.
机译：评估发生生态过程的相关空间尺度对于全面了解生态系统功能特别重要。在沿海生态系统中，人们在不同的空间尺度上研究了营养相互作用的变异性，但从未研究过从厘米到米的尺度。在本研究中，我们调查了生境结构与潮间巨石场生态系统中食物网功能的小规模变异之间的联系。考虑了两个微生境，巨石顶和巨石底，并使用稳定的同位素示踪剂研究了无脊椎动物消费者的营养生态。我们发现，北大西洋多岩石海岸的两个主要悬浮物馈线（海绵Halichondria panicea和Hymeniacidon血红）一致，卵石下采样的个体富集〜（15）N，表明这些消费者根据居住的微生境依赖不同的营养资源。 ，以厘米为单位。在巨石下发现的高锇（15）N信号表明在该微生境中更多地使用了高度分解的有机物。在较高营养级别的消费者中，两个微生境之间的同位素差异减小，这可能在包括两个微生境的空间尺度上进行。最后，我们的结果表明，在高度异质的生境（例如巨石场）中，营养相互作用在空间上可能会发生很大变化，应在以后的研究中加以考虑。栖息地物理结构和食物网可变性之间的联系也可能有助于表征异质生态系统的高度生物多样性。

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  • 来源
    《Marine biology》 |2011年第3期|p.623-630|共8页
  • 作者

    Gauthier Schaal; Pascal Riera; Cedric Leroux;

  • 作者单位

    Department of Zoology and Entomology, Rhodes University PO Box 94, Grahamstown 6140, South Africa,UPMC Univ Paris 06, Station Biologique de Roscoff,Place Georges Teissier, 69682 Roscoff Cedex, France,CNRS UMR 7144 AD2M, Equipe Reseaux Trophiques et Productions Benthiques, Roscoff Cedex, France;

    UPMC Univ Paris 06, Station Biologique de Roscoff,Place Georges Teissier, 69682 Roscoff Cedex, France,CNRS UMR 7144 AD2M, Equipe Reseaux Trophiques et Productions Benthiques, Roscoff Cedex, France;

    UPMC Univ Paris 06, Station Biologique de Roscoff,Place Georges Teissier, 69682 Roscoff Cedex, France;

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