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Sympatric variability of isotopic baselines influences modeling of fish trophic patterns

机译：同位素基线的同伴异质性影响鱼类营养模式的建模

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摘要

Stable isotope signatures of freshwater snails and mussels have been established as a convenient baseline measurement at the primary consumer level for food-web coupling studies. We measured δ15N and δ13C of primary consumers, including mussels (Anodonta woodiana, Cristaria plicata, and Unio douglasiae), snails (Bellamya aeruginosa and Hippeutis sp.), and zooplankton from the same habitat within a shallow eutrophic lake. Primary consumers showed positive relationship between δ15N and δ13C, indicating a linkage between planktonic and benthic habitats in this system. The variation in isotope ratios was higher in short-lived primary consumers (zooplankton) compared with the long-lived primary consumers (mussels and snails), suggesting limited availability of short-lived primary consumers as isotopic baselines in aquatic food-web assessment. Significant differences in isotope ratios were also found among three species of mussels, and when using these mussels separately as pelagic baselines to calculate trophic position and contribution of planktonic and benthic sources of fishes, bias and even misestimates were observed. This finding suggests that caution is needed when multiple primary consumers coexist in the same habitat, and it is important to assess potential effects of different baselines used.
机译：已经建立了淡水蜗牛和贻贝的稳定同位素特征，可以作为在初级消费者一级进行食物网耦合研究的便捷基准测量方法。我们测量了主要消费者的δ15 N和δ13 C，包括贻贝（Anodonta woodiana，Cristaria plicata和Unio douglasiae），蜗牛（Bellamya aeruginosa和Hippeutis sp。）和浮游动物来自同一栖息地。浅水富营养化的湖泊。主要消费者显示出δ15 N和δ13 C之间呈正相关，表明该系统中浮游生物和底栖生物之间存在联系。短期主要消费者（贻贝和蜗牛）的同位素比率变化高于长期主要消费者（贻贝和蜗牛），这表明短期主要消费者作为水生食物网评估的同位素基线的可用性有限。在三种贻贝中也发现了同位素比率的显着差异，当分别使用这些贻贝作为浮游基准来计算鱼类的营养位置和浮游和底栖鱼类来源时，观察到偏差甚至是错误估计。这一发现表明，当多个主要消费者共同存在于同一栖息地时，需要谨慎行事，评估使用不同基准的潜在影响非常重要。

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  • 来源
    《Limnology》 |2011年第2期|p.107-115|共9页
  • 作者

    Jun Xu; Min Zhang; Ping Xie;

  • 作者单位

    Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, People’s Republic of China;

    College of Fisheries, Huazhong Agricultural University, Wuhan, 430070, People’s Republic of China;

    Donghu Experimental Station of Lake Ecosystems, State Key Laboratory of Freshwater Ecology and Biotechnology of China, Institute of Hydrobiology, Chinese Academy of Sciences, Wuhan, 430072, People’s Republic of China;

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  • 正文语种 eng
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  • 关键词

    Mussel; Snail; Stable isotope; Baseline; Trophic modeling; Trophic interaction; Shallow lake; Eutrophication;

    机译：贻贝;蜗牛;稳定同位素;基线;营养模型;营养相互作用;浅湖;富营养化;

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