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http://dx.doi.org/10.11614/KSL.2017.50.4.432

Determination of Trophic Position Using Nitrogen Isotope Ration of Individual Amino Acid in the Geum Estuary  

Choi, Hyuntae (Department of Marine Sciences and Convergent Technology, Hanyang University)
Choi, Bohyung (Department of Marine Sciences and Convergent Technology, Hanyang University)
Shin, Kyung-Hoon (Department of Marine Sciences and Convergent Technology, Hanyang University)
Publication Information
Korean Journal of Ecology and Environment / v.50, no.4, 2017 , pp. 432-440 More about this Journal
Abstract
Compound specific isotope analysis of amino acids (CSIA-AAs) is being highlighted as an alternative approach for overcoming some restrictions in application of stable isotope analysis of bulk tissue (SIA) for trophic position (TP) estimation. However, this approach has rarely been applied in Korea. The present study determines TP of two Polychaeta (Nephtyidae and Glyceridae) and two fish species(Platycephalus indicus and Lophius litulon) collected from the Geum River estuary using nitrogen isotope ratio of amino acid and compared with the TP values estimated by SIA. The Polychaeta species, sampled in two sites, showed similar TP between SIA(2.7 and 3.1) and CSIA-AAs (2.6 and 3.1). However, for both fish species, TP values displayed a large difference between SIA (3.1 and 2.3) and CSIA-AAs (3.8 and 3.7). In this study TP values estimated by CSIA-AAs showed more similar to the previously reported gut content analysis of both fishes compared with the results of SIA. Current study suggests the applicability of nitrogen isotope ratio of amino acid to understand coastal ecosystem structure and trophic ecology.
Keywords
amino acid; compound-specific stable isotope analysis; trophic position; nitrogen stable isotope; estuary;
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