The Signatures of Stable Isotopes δ^(15)N and δ^(13)C in Anadromous and Non-Anadromous Coilia nasus Living in the Yangtze River, and the Adjacent Sea Waters  

作　　者：WANG Lei TANG Wenqiao DONG Wenxia 

机构地区：[1]Laboratory of Fishes,Key Laboratory of Exploration and Utilization of Aquatic Genetic Resources (Ministry of Education of China),Shanghai Ocean University

出　　处：《Journal of Ocean University of China》2015年第6期1053-1058,共6页中国海洋大学学报（英文版）

基　　金：financially supported by the Special Fund for Agro-scientific Research in the Public-Interest(Grant No.201203065);the National Natural Science Foundation of China(Nos.31172407;1472280);the Specialized Research Fund for the Doctoral Program of Higher Education(No.20123104110006)

摘　　要：Stable isotopes are increasingly used to investigate seasonal migrations of aquatic organisms. This study employed stable isotopes (delta C-13 and delta N-15) for Coilia nasus from the lower Yangtze River and the adjacent East China Sea to distinguish different ecotypic groups, ascertain trophic nutrition positions, and reflect environmental influences on C. nasus. delta C-13 signatures of C. nasus sampled from Zhoushan (ZS), Chongming (CM), and Jingjiang (JJ) waters were significantly higher than those from the Poyang Lake (PYL) (P < 0.05). By contrast, delta N-15 signatures of C. nasus in ZS, CM, and JJ groups were significantly lower than those in PYL group (P < 0.05). Basing on delta C-13 and delta N-15 signatures, we could distinguish anadromous (ZS, CM, and JJ) and non-anadromous (PYL) groups. The trophic level (TL) of anadromous C. nasus ranged from 2.90 to 3.04, whereas that of non-anadromous C. nasus was 4.38. C. nasus occupied the middle and top nutrition positions in the marine and Poyang Lake food webs, respectively. C. nasus in Poyang Lake were significantly more enriched in delta N-15 but depleted in delta C-13, suggesting that anthropogenic nutrient inputs and terrigenous organic carbon are important to the Poyang Lake food web. This study is the first to apply delta N-15 and delta C-13 to population assignment studies of C. nasus in the Yangtze River and its affiliated waters. Analysis of stable isotopes (delta N-15 and delta C-13) is shown to be a useful tool for discriminating anadromous and non-anadromous C. nasus.Stable isotopes are increasingly used to investigate seasonal migrations of aquatic organisms. This study employed stable isotopes(δ^(13) and δ15N) for Coilia nasus from the lower Yangtze River and the adjacent East China Sea to distinguish different ecotypic groups, ascertain trophic nutrition positions, and reflect environmental influences on C. nasus. δ^(13)C signatures of C. nasus sampled from Zhoushan(ZS), Chongming(CM), and Jingjiang(JJ) waters were significantly higher than those from the Poyang Lake(PYL)(P < 0.05). By contrast, δ^(15)Nsignatures of C. nasus in ZS, CM, and JJ groups were significantly lower than those in PYL group(P < 0.05). Basing on δ^(13) and δ^(15)Nsignatures, we could distinguish anadromous(ZS, CM, and JJ) and non-anadromous(PYL) groups. The trophic level(TL) of anadromous C. nasus ranged from 2.90 to 3.04, whereas that of non-anadromous C. nasus was 4.38. C. nasus occupied the middle and top nutrition positions in the marine and Poyang Lake food webs, respectively. C. nasus in Poyang Lake were significantly more enriched in δ^(15)N but depleted in δ^(13), suggesting that anthropogenic nutrient inputs and terrigenous organic carbon are important to the Poyang Lake food web. This study is the first to apply δ^(15)Nand δ^(13) to population assignment studies of C. nasus in the Yangtze River and its affiliated waters. Analysis of stable isotopes(δ^(15)Nand δ^(13)) is shown to be a useful tool for discriminating anadromous and non-anadromous C. nasus.

关 键 词：Japanese grenadier anchovy delta C-13 delta N-15 Changjiang River Poyang Lake 

分 类 号：S917.4[农业科学—水产科学]