Trace elements in Antarctic fish species and the influence of foraging habitats and dietary habits on mercury levels

The Science of the Total Environment
Aurélie GouttePaco Bustamante

Abstract

This study aims at describing and interpreting concentration profiles of trace elements in seven Antarctic fish species (N=132 specimens) off Adélie Land. Ichthyofauna plays a key role in the Antarctic ecosystem, as they occupy various ecological niches, including cryopelagic (ice-associated), pelagic, and benthic habitats. Firstly, trace element levels in the studied specimens were similar to those previously observed in fish from the Southern Ocean. Apart from manganese and zinc, concentrations of arsenic, cadmium, copper, iron, mercury (Hg), nickel, selenium and silver differed among fish species. Muscle δ(13)C and δ(15)N values were determined to investigate whether the fish foraging habitats and dietary habits could explain Hg levels. Species and foraging habitat (δ(13)C) were strong predictors for variations of Hg concentrations in muscle tissues. The highest Hg contamination was found in shallow benthic fish compared to cryopelagic and pelagic fish. This pattern was likely due to the methylation of Hg in the coastal sediment and the photodemethylation by ultraviolet radiation in surface waters.

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Citations

Jul 30, 2016·Rapid Communications in Mass Spectrometry : RCM·Yinping WangWenxia Wang
Dec 29, 2020·Chemosphere·Daniela A Murillo-CisnerosTodd M O'Hara
Jan 18, 2021·The Science of the Total Environment·A LischkaT Lacoue-Labarthe
Jun 14, 2020·The Science of the Total Environment·Mackenzie Anne Clifford MartyniukMichael Power

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