Mercury in Barents Sea fish in the Arctic polar night: Species and spatial comparison

MARINE POLLUTION BULLETIN

卷:169

Article

Gopakumar, Anjali¹  Giebichenstein, Julia¹  Raskhozheva, Evgeniia²  Borga, Katrine¹ 

[1] Univ Oslo, Dept Biosci, Sect Aquat Biol & Toxicol, Postboks 1066, N-0316 Oslo, Norway

[2] Russian Acad Sci, Murmansk Marine Biol Inst, 17 Vladimirskaya St, Murmansk 183010, Russia

关键词: Arctic;    Polar cod;    Atlantic cod;    Capelin;    Stable isotopes;    Mercury;   

DOI  :  10.1016/j.marpolbul.2021.112501

来源: Elsevier

【 摘 要 】

Although mercury (Hg) in polar ecosystems has been well-studied, there is little information on Hg in the Arctic during low-productivity seasons like the polar night. We quantified Hg concentrations, carbon, and nitrogen stable isotope ratios (delta 13C and delta 15N) in the muscle of polar cod (Boreogadus saida), Atlantic cod (Gadus morhua), and capelin (Mallotus villosus) sampled from the North-West and North-East Barents Sea during November-December 2019. Hg concentrations varied between species (14-175 ng/g dw), dependent on region, but were well below the toxicity threshold for fish health and the EU-accepted threshold for human consumption. Interspecific differences were observed only in the North-East region, with Atlantic cod having highest Hg concentrations, explained by its larger size, higher trophic position and benthopelagic feeding. Spatial differences in polar cod with higher Hg concentrations in the North-East than the North-West were likely due to a combination of differences in food web structure and Hg exposure.

【 授权许可】

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