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Fish rely on scyphozoan hosts as a primary food source: evidence from stable isotope analysis

机译：鱼类依赖子甲虫宿主作为主要食物来源：稳定同位素分析的证据

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摘要

Predation of fish on their scyphozoan hosts has not been clearly defined using analysis of gut contents because gelatinous prey are difficult to visually detect and are dissolved by fixative solutions. Therefore, scyphome-dusae have been generally considered not relevant in fish diet. To determine the contribution of their scyphozoan host tissue to the assimilated diet of age-0 Chloroscom-brus chrysurus, we determined δ～(13)C and δ～(15)N of fish, their hosts (scyphomedusae Aurelia sp. and Drymonema lar-soni) and their potential prey-small plankton (＜200 μm) and mesozooplankton (＞200 μm)-in the coastal waters of Alabama, USA. The diet of C. chrysurus was defined using the Bayesian mixing model Stable Isotope Analysis in R (SIAR). Models indicated that the scyphozoan hosts contributed on average ～90 % to fish assimilated diet. In contrast with previous dietary assessments based on analysis of gut contents, these results highlight that scyphozoans are important to the diet of fish associated with them. Because several ecologically and economically important fish species live in association with scyphomedusae, a redefinition of trophic links in marine food webs may be needed in light of the findings in this study.
机译：由于对胶状猎物的目视难以检出并被固定液溶解，因此尚无法通过对肠内容物的分析来明确界定其在后生动物宿主上的鱼类捕食。因此，通常认为鞘氨醇-杜莎与鱼类饮食无关。为了确定他们的后生子宿主组织对0岁Chloroscom-brus chrysurus的同化饮食的贡献，我们确定了鱼类，它们的宿主（Smedphomedusae Aurelia sp。和Drymonema lar）的δ〜（13）C和δ〜（15）N。 -soni）及其潜在的猎物-美国阿拉巴马州沿海水域中的小型浮游生物（＜200μm）和中型浮游动物（＞ 200μm）。用贝叶斯混合模型R中的稳定同位素分析法（SIAR）定义了C. chrysurus的饮食。模型表明，后生动物宿主对鱼类同化饮食的贡献平均约为90％。与以前基于肠道含量分析的饮食评估相比，这些结果突出表明，子鞘动物对于与其相关的鱼的饮食很重要。由于几种在生态上和经济上重要的鱼类都与鞘翅目甲藻生活在一起，因此根据本研究的发现，可能需要重新定义海洋食物网中的营养连接。

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  • 来源
    《Marine biology》 |2015年第2期|247-252|共6页
  • 作者

    Isabella DAmbra; William M. Graham; Ruth H. Carmichael; Frank J. Hernandez Jr.;

  • 作者单位

    Dauphin Island Sea Lab, Dauphin Island, AL 36528, USA,Department of Marine Sciences, University of South Alabama, Mobile, AL 36668, USA,Via Santa Maria a Cubito 687, 80145 Naples, Italy;

    Stennis Space Center, Department of Marine Science, University of Southern Mississippi, Hattiesburg, MS 39529, USA;

    Dauphin Island Sea Lab, Dauphin Island, AL 36528, USA,Department of Marine Sciences, University of South Alabama, Mobile, AL 36668, USA;

    Department of Coastal Sciences, University of Southern Mississippi, Ocean Springs, MS 39564, USA;

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