Spatial variability in selenium and mercury interactions in a key recreational fish species: Implications for human health and environmental monitoring |
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Authors: | H.J. Jones E.C.V. Butler C.K. Macleod |
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Affiliation: | 1. Institute for Marine and Antarctic Studies, University of Tasmania, Private bag 49, Hobart, TAS 7001, Australia;2. Australian Institute of Marine Science, PO Box 41775, Casuarina, NT 0811, Australia |
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Abstract: | Selenium’s (Se) protective effects against mercury (Hg) toxicity have been demonstrated; however, this is seldom considered in health assessments, where dietary exposure is still evaluated by Hg concentration alone. Se:Hg ratios and selenium health benefit values (Se HBVs) offer a more comprehensive seafood safety model. Here we describe total mercury (THg), methylmercury (MeHg) and Se concentrations in fish from a Hg-polluted estuary. Spatial variation in THg, MeHg and Se was evident, though all regions maintained Se:Hg ratio values >1. Se HBV varied between regions and in one region mean negative values (−5.17) were evident. This study provides the first evidence that quoting a single all-encompassing Se HBV is not appropriate when species demonstrate strong site fidelity. It highlights the need for research into Se–Hg relationships in environments with established Hg pollution and reinforces the assertion that Se concentration be considered in assessments of human health risk to Hg exposure. |
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Keywords: | Platycephalus bassensis Derwent Estuary Seafood safety Contaminant assessment Se health benefit value (Se HBV) |
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