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首页> 外文期刊>Marine ecology progress series >Unexpected shifts in fatty acid composition in response to diet in a common littoral amphipod
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Unexpected shifts in fatty acid composition in response to diet in a common littoral amphipod

机译：在常见的沿海两栖动物中，饮食中脂肪酸组成的意外变化

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摘要

To determine whether fatty acid (FA) profiles are a useful biomarker to trace the flow of material in a coastal food web, we fed the sandhopper Bellor-chestia quoyana specific seaweed diets, each with a contrasting FA profile including Durvillaea antarctica (Phaeophyta), Ecklonia radiata (Phaeophyta) or Ulva sp. (Chlorophyta). We then compared changes in FA composition in relation to diet for this sandhopper. After 12 d, sandhoppers from each treatment had distinct FA profiles, particularly with respect to polyunsaturated FAs (PUFAs); however, increases in specific FAs did not relate to those FAs that were abundant in their diet. For example, sandhoppers fed PUFA-deficient Ulva sp. exhibited a relative increase in PUFAs. The E. radiata and Ulva sp. diets both caused significant shifts in sandhopper FA composition over the course of the experiment. In order to follow the assimilation of carbon and FAs, sandhoppers were fed natural or ~(13)C-enhanced E. radiata or Ulva sp., and changes to the δ~(13)C of individual FAs were measured over time. Turnover of the most abundant FAs, 16:0 and 18:lω9, was higher for sandhoppers fed E. radiata than for those fed Ulva sp. Comparisons between bulk tissue δ~(13)C and δ~(13)C of individual FAs were consistent with sandhoppers modifying the turnover rate of FA in response to diet. These findings suggest that there is no consistent relationship between the FA compositions of green and brown seaweeds and that of the sandhopper B. quoyana. We caution that community-level application of FAs as a dietary biomarker tool must be accompanied by controlled experiments incorporating key species of relevance.
机译：为了确定脂肪酸（FA）谱是否是有用的生物标志物，以追踪沿海食物网中的物质流动，我们饲喂了沙漏斗鱼Bellor-chestia quoyana特有的海藻饮食，每种饮食都有对比的FA谱，包括南极草（Durvillaea antarctica（Phaeophyta）），辐射菌（Phaeophyta）或Ulva sp。 （绿藻）。然后，我们比较了这种沙漏鱼相对于饮食的FA组成变化。 12天后，每种处理的沙sand都有不同的FA曲线，尤其是多不饱和FA（PUFA）。然而，特定脂肪酸的增加与那些饮食中丰富的脂肪酸无关。例如，沙hopper喂食了缺乏PUFA的Ulva sp。表现出PUFA相对增加。辐射大肠杆菌和Ulva sp。在实验过程中，两种饮食都导致沙漏FA组成发生明显变化。为了跟踪碳和FA的同化作用，给沙hopper喂食了天然的或〜（13）C增强的辐射大肠杆菌或Ulva sp。，并测量了各个FA随时间变化的δ〜（13）C。饲喂辐射E的沙hopper的最丰富FA的周转率16：0和18：lω9高于饲喂Ulva sp。的FA。单个脂肪酸的散装组织δ〜（13）C和δ〜（13）C之间的比较与沙漏根据饮食改变FA的周转率是一致的。这些发现表明，绿色和棕色海藻的FA成分与沙hopperB。quoyana的FA成分之间没有一致的关系。我们告诫，在社区一级将FAs用作饮食生物标志物的工具必须伴随有纳入相关关键物种的对照实验。

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  • 来源
    《Marine ecology progress series》 |2013年第8期|1-12|共12页
  • 作者

    R. J. McLeod; G. A. Hyndes; C. L. Hurd; R. D. Frew;

  • 作者单位

    Department of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand;

    Centre for Marine Ecosystems Research, School of Natural Sciences, Edith Cowan University, 270 Joondalup Drive, Joondalup, Western Australia, Australia;

    Department of Botany, University of Otago, PO Box 56, Dunedin, New Zealand;

    Department of Chemistry, University of Otago, PO Box 56, Dunedin, New Zealand,FAO/IAEA Division of Nuclear Techniques in Food and Agriculture, Wagramer Strasse 5, PO Box 100,1400 Vienna, Austria;

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  • 关键词

    stable isotopes; biomarker; food web; seaweed; invertebrate; ~(13)c tracer; compound- specific stable isotopes; GC-IRMS;

    机译：稳定同位素生物标志物食物网;海藻无脊椎动物〜（13）c示踪剂;化合物特异性稳定同位素;气相色谱仪;

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