Journal
MARINE POLLUTION BULLETIN
Volume 171, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.marpolbul.2021.112777
Keywords
Nitrogen isotope; Isotopic baseline; CSIA of amino acids; Trophic position
Funding
- Ministry of Oceans and Fisheries, Korea
- National Research Foundation of Korea (NRF) - Korean government (Ministry of Science and ICT) [NRF-2016R1E1A1A01943004]
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The study found that mussels have higher trophic positions, requiring normalization of basal nitrogen isotope ratio. Spatial variations in nitrogen isotopic baselines in mussels reflect different nitrogen sources. Delta N-15 (base-bulk) and Delta N-15 (base-phe) are powerful tools for tracing nitrogen isotopic baselines.
We sampled mussels (Mytilus edulis) along the coast of the Korean peninsula, and determined their trophic position (TP) using the nitrogen isotope ratio of amino acids (TPglu/phe). The TPglu/phe of mussels (2.0 to 2.5) is higher than TP of herbivores, suggesting that TP normalization is required to remove the trophic enrichment effect on basal nitrogen isotope ratio. We found similar trends in spatial variation between nitrogen isotopic baseline based on nitrogen isotope ratio of bulk tissue (delta N-15(base-bulk)) and that of phenylalanine (delta N-15(base-phe)) in mussels, reflecting different nitrogen sources among sampling sites. The present study suggests that delta N-15(base-bulk) and delta N-15(base-phe) are powerful tools to trace nitrogen isotopic baselines from primary consumers as well as higher TP organisms.
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