Large scale surveys suggest limited mercury availability in tropical north Queensland (Australia)

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Title Large scale surveys suggest limited mercury availability in tropical north Queensland (Australia)
Author Jardine, Timothy; Halliday, Ian A.; Howley, Christina; Sinnamon, Vivian; Bunn, Stuart
Journal Name Science of the Total Environment
Year Published 2012
Place of publication Netherlands
Publisher Elsevier
Abstract Little is known about the threat of mercury (Hg) to consumers in food webs of Australia's wet–dry tropics. This is despite high concentrations in similar biomes elsewhere and a recent history of gold mining that could lead to a high degree of exposure for biota. We analysed Hg in water, sediments, invertebrates and fishes in rivers and estuaries of north Queensland, Australia to determine its availability and biomagnification in food webs. Concentrations in water and sediments were low relative to other regions of Hg concern, with only four of 138 water samples and five of 60 sediment samples above detection limits of 0.1 μg L− 1 and 0.1 μg g− 1, respectively. Concentrations of Hg in fishes and invertebrates from riverine and wetland food webs were well below international consumption guidelines, including those in piscivorous fishes, likely due to low baseline concentrations and limited rates of biomagnification (average slope of log Hg vs. δ15N = 0.08). A large fish species of recreational, commercial, and cultural importance (the barramundi, Lates calcarifer), had low concentrations that were below consumption guidelines. Observed variation in Hg concentrations in this species was primarily explained by age and foraging location (floodplain vs. coastal), with floodplain feeders having higher Hg concentrations than those foraging at sea. These analyses suggest that there is a limited threat of Hg exposure for fish-eating consumers in this region.
Peer Reviewed Yes
Published Yes
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Copyright Statement Copyright 2012 Elsevier B.V.. This is the author-manuscript version of this paper. Reproduced in accordance with the copyright policy of the publisher. Please refer to the journal's website for access to the definitive, published version.
Volume 416
Page from 385
Page to 393
ISSN 0048-9697
Date Accessioned 2012-02-24
Language en_US
Research Centre Australian Rivers Institute
Faculty Faculty of Science, Environment, Engineering and Technology
Subject Environmental Monitoring
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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