Determination of Trophic Levels of Marine Fish Using Stable Isotope Analysis of Fish Scale Nitrogen (δ15N) in the Yellow Sea and Northern East China Sea

文献类型： 外文期刊

第一作者： Bai, Huaiyu

作者： Bai, Huaiyu;Huang, Lingfeng;Huang, Lingfeng;Sun, Yao

作者机构：

关键词： fish scale; stable isotope analysis; trophic level; Yellow Sea; northern East China Sea

期刊名称：JOURNAL OF OCEAN UNIVERSITY OF CHINA （ 影响因子：1.2； 五年影响因子：1.5 ）

ISSN： 1672-5182

年卷期： 2025 年 24 卷 3 期

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收录情况： SCI

摘要： Fish scale delta N-15 (delta N-15(sca)) records trophic information of the whole life history for marine fishes. Data from gut content and values calculated from white muscle tissue (WMT) are insufficient for assessing trophic level (TL) of marine fishes as they only provide the information of several months or even several days. Stable isotope analysis (SIA) of nitrogen was carried out in fish scales and WMT of 16 species from a total of 28 individuals captured from the Yellow Sea and northern East China Sea in October and November of 2019, aiming at discovering the correlation between delta N-15(sca) and fish WMT delta N-15 (delta N-15(WMT)), so as to use delta N-15(sca) for the characterization of TLs of marine fish. Scales were analyzed without prior carbonate dissolution as a pre-processing step. TL calculated from delta N-15(sca) was compared to traditional TL formula calculated with delta N-15(WMT) to estimate the accuracy. We found that there was a highly significant and positive correlation (r=0.830, P<0.001) between delta N-15(sca) and delta N-15(WMT). TL calculation results using fish scale (TLsca) and WMT (TLWMT) showed congruence (r=0.773, P<0.001), and the regression coefficient between delta N-15(sca) and delta N-15(WMT) was used for calculating TLsca. The conversion was conducted for the purpose of comparison with previous delta N-15(WMT)-based calculation results of TL. TLsca calculation results were 81.25% within the TL range of +/- 10% calculated with delta N-15(WMT). The findings in the present study showed that delta N-15(sca) is a viable technique for the characterization of the TL of marine fish and can help to predict food web and support the study of marine ecosystem.

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