Abstract
We measured total mercury (Hg) and selenium (Se) concentrations as well as stable nitrogen (N) isotopic composition in flyingfish and squid muscle tissues from the eastern Indian Ocean and western South China Sea. The results showed that the mean Hg concentration in squid muscle from the western South China Sea was lower than that in the eastern Indian Ocean. The Hg concentrations in flyingfish and squid muscle samples were positively correlated with organism size (length and weight) and δ15N in all the study areas. Furthermore, we found a negative correlation between Se and Hg in molar content of flyingfish and squid muscle from the western South China Sea. The Se:Hg molar ratio was significantly negative correlated with fish weight and δ15N, suggesting that the Se:Hg molar ratio decreases with the increase of fish size and trophic level in the food web.
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Acknowledgements
This work was funded by the National Natural Science Foundation of China (Nos. 41376124, 41576183 and 41776188). We are especially grateful to Pingqing Fu and Shengjie Hou for their help in stable isotope analyses. We deeply thank the open scientific expedition cruise to eastern Indian Ocean in 2014 and western South China Sea in 2015 funded by the National Natural Science Foundation of China. Xisha Deep Sea Marine Environment Observation and Research Station, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Liqiang Xu, Daning Li, Jichun Tang and Min Guo are acknowledged and thanked for their help in sample collection.
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Wang, X., Wu, L., Sun, J. et al. Mercury Concentrations and Se:Hg Molar Ratios in Flyingfish (Exocoetus volitans) and Squid (Uroteuthis chinensis). Bull Environ Contam Toxicol 101, 42–48 (2018). https://doi.org/10.1007/s00128-018-2369-6
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DOI: https://doi.org/10.1007/s00128-018-2369-6