Determination of trophic levels of marine fish in the Yellow Sea and northern East China Sea using nitrogen stable isotope (delta N-15) analysis of otoliths

文献类型： 外文期刊

第一作者： Bai, Huaiyu

作者： Bai, Huaiyu;Huang, Lingfeng;Bai, Huaiyu;Wang, Yukun;Zhang, Tingting;Dai, Fangqun;Sun, Yao;Huang, Lingfeng;Sun, Yao

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关键词： stable isotope analysis; delta N-15; otolith; trophic level

期刊名称：JOURNAL OF OCEANOLOGY AND LIMNOLOGY （ 影响因子：1.265； 五年影响因子：1.276 ）

ISSN： 2096-5508

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收录情况： SCI

摘要： Fish otolith delta N-15 (delta N-15(oto)) is a demonstrated source of information of dietary history for marine fish as it is available in otolith archives and sedimentary deposits unlike white muscle tissue (WMT). WMT and stomach content data are insufficient for trophic level (TL) data of past fishes which is important for the changes of marine fishery resources over long time scales. To determine the correlation between delta N-15(oto) and fish WMT delta N-15 (delta N-15(wmt)) and the feasibility of using delta N-15(oto) in characterizing the TLs of marine fishes, we conducted nitrogen stable isotope analysis (SIA) in the otolith and WMT of 36 marine fish species sampled from the Yellow Sea and northern East China Sea in 2011-2014. Both delta N-15(oto) and delta N-15(wmt) were analyzed using an elemental analyzer coupled with an isotope ratio mass spectrometer (EA-IRMS). Multiple otoliths were combined to make each otolith measurement and were analyzed as-is without a carbonate dissolution pre-processing step. delta N-15(oto) and delta N-15(wmt) comparisons for species in the Yellow Sea and northern East China Sea are currently lacking and would be helpful for both regional studies and for increasing the number of species for which delta N-15(oto) and delta N-15(wmt) have been compared. Additionally, to determine the relative accuracy of trophic level calculated using delta N-15(oto), we compared TL calculated from delta N-15(oto) to traditional trophic level metrics calculated using delta N-15(wmt). The results showed a positive and highly significant correlation (R=0.780, P<0.001) between delta N-15(oto) and delta N-15(wmt). Trophic level estimation using WMT (TLwmt) and otolith (TLoto) showed congruence in our study, which is not entirely surprising given that delta N-15(oto) was regressed against delta N-15(wmt) and the resulting regression coefficient was used to convert delta N-15(oto) to delta N-15(wmt) prior to calculating TLoto. This conversion was required in order to be consistent with previous delta N-15(wmt)-based calculations of TL for comparison. TLoto calculations resulted in TL values that were largely within 5%-10% of TL values calculated with delta N-15(wmt). Our findings show that delta N-15(oto) is a feasible technique for characterizing the TLs of marine fish and can also assist in food web and marine ecosystem studies.

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