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首页> 外文期刊>Journal of Fish Biology >Stable-isotope analysis of a deep-sea benthic-fish assemblage: evidence of an enriched benthic food web
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Stable-isotope analysis of a deep-sea benthic-fish assemblage: evidence of an enriched benthic food web

机译：深海底栖鱼类组合的稳定同位素分析：丰富的底栖食物网的证据

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摘要

In this study, fishes and invertebrates collected from the continental slope (1000 m) of the eastern North Pacific Ocean were analysed using stable-isotope analysis (SIA). Resulting trophic positions (TP) were compared to known diets and habitats from the literature. Dual isotope plots indicated that most species groups (invertebrates and fishes) sorted as expected along the carbon and nitrogen axes, with less intraspecific variability than interspecific variability. Results also indicated an isotopically distinct benthic and pelagic food web, as the benthic food web was more enriched in both nitrogen and carbon isotopes. Trophic positions from SIA supported this finding, resulting in the assignment of fishes to different trophic positions from those expected based on published dietary information. These differences can be explained largely by the habitat of the prey and the percentage of the diet that was scavenged. A mixing model estimated dietary contributions of prey similar to those of the known diet of Bathyraja trachura from stomach-content analysis (SCA). Linear regressions indicated that trophic positions calculated from SIA and SCA, when plotted against B. trachura total length for 32 individuals, exhibited similar variation and patterns. Only the TP from SCA yielded significant results (stomach content: P < 0.05, stable isotope: P > 0.05). (C) 2012 The Authors Journal of Fish Biology (C) 2012 The Fisheries Society of the British Isles
机译：在这项研究中，使用稳定同位素分析（SIA）分析了北太平洋东部大陆坡（1000 m）收集的鱼类和无脊椎动物。将得到的营养位置（TP）与文献中已知的饮食和栖息地进行了比较。双同位素图表明，大多数物种组（无脊椎动物和鱼类）沿碳和氮轴按预期排序，种内变异性比种间变异性小。结果还表明，底栖食物网具有同位素分异的特征，因为底栖食物网富含氮和碳同位素。 SIA的营养位置支持了这一发现，从而导致鱼类的营养位置与根据公开的饮食信息所预期的营养位置不同。这些差异很大程度上可以通过猎物的栖息地和被清除的饮食百分比来解释。混合模型通过胃内容分析法（SCA）估算出与已知的拟南芥（Bathyraja trachura）饮食相似的饮食食物。线性回归表明，根据SIA和SCA计算的营养位置，针对32位个体的沙眼衣原体全长，显示出相似的变异和模式。只有来自SCA的TP产生显着结果（胃液含量：P <0.05，稳定同位素：P> 0.05）。 （C）2012作者鱼生物学杂志（C）2012不列颠群岛渔业协会

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