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首页> 外文期刊>Philosophical Transactions of the Royal Society of London, Series B. Biological Sciences >The potential of fatty acid isotopes to trace trophic transfer in aquatic food-webs
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The potential of fatty acid isotopes to trace trophic transfer in aquatic food-webs

机译：脂肪酸同位素的潜力追踪水生食品纤维网中的营养转移

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摘要

Compound-specific isotope analyses (CSIA) of fatty acids (FA) constitute a promising tool for tracing energy flows in food-webs. However, past applications of FA-specific carbon isotope analyses have been restricted to a relatively coarse food-source separation and mainly quantified dietary contributions from different habitats. Our aim was to evaluate the potential of FA-CSIA to provide high-resolution data on within-system energy flows using algae and zooplankton as model organisms. First, we investigated the power of FA-CSIA to distinguish among four different algae groups, namely cyanobacteria, chlorophytes, haptophytes and diatoms. We found substantial within-group variation but also demonstrated that delta C-13 of several FA (e.g. 18:3 omega 3 or 18:4 omega 3) differed among taxa, resulting in group-specific isotopic fingerprints. Second, we assessed changes in FA isotope ratios with trophic transfer. Isotope fractionation was highly variable in daphnids and rotifers exposed to different food sources. Only delta C-13 of nutritionally valuable poly-unsaturated FA remained relatively constant, highlighting their potential as dietary tracers. The variability in fractionation was partly driven by the identity of food sources. Such systematic effects likely reflect the impact of dietary quality on consumers' metabolism and suggest that FA isotopes could be useful nutritional indicators in the field. Overall, our results reveal that the variability of FA isotope ratios provides a substantial challenge, but that FA-CSIA nevertheless have several promising applications in food-web ecology. This article is part of the theme issue 'The next horizons for lipids as 'trophic biomarkers': evidence and significance of consumer modification of dietary fatty acids'.
机译：脂肪酸（FA）的复合特异性同位素分析（CSIA）构成了用于追踪食物网中的能量流动的有希望的工具。然而，过去的FA特异性碳同位素分析的应用仅限于相对粗糙的食物源分离，主要是来自不同栖息地的饮食贡献。我们的目标是评估FA-CSIA的潜力，以便使用藻类和Zooplankton作为模型生物的系统内能量流量提供高分辨率数据。首先，我们调查了Fa-CSIA的力量，区分了四种不同的藻类，即蓝藻，叶绿素，抗噬菌体和硅藻。我们发现大量内部变异，但还证明了几种FA（例如18：3 omega 3或18：4 omega 3）的ΔC-13在征集中不同，导致组特异性同位素指纹。其次，我们评估了具有营养转移的FA同位素比的变化。同位素分馏在Daphnids和暴露于不同食物来源的轮虫器中具有高度可变的。只有营养有价值的多种不饱和Fa的Delta C-13仍然相对恒定，突出了它们作为饮食示踪剂的潜力。分馏的变异性是由食物来源的身份部分驱动的。这种系统效应可能反映膳食质量对消费者的新陈代谢的影响，并表明FA同位素可能是该领域有用的营养指标。总体而言，我们的结果表明，FA同位素比的可变性提供了大量的挑战，但FA-CSIA在食品网生态学中有几个有前途的应用。本文是主题问题的一部分，是脂质的下一个视野作为“营养生物标志物”：消费者修饰膳食脂肪酸的证据和意义。

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