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Complex patterns in fish - sediment mercury concentrations in a contaminated estuary: The influence of selenium co-contamination?

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dc.contributor Australian Institute Of Marine Science
dc.contributor Univ Tasmania
dc.contributor University Of Tasmania
dc.contributor Australian Inst Marine Sci
dc.contributor Inst Marine & Antarctic Studies
dc.contributor.author MACLEOD, C. K.
dc.contributor.author JONES, H. J.
dc.contributor.author SWADLING, K. M.
dc.contributor.author BUTLER, E. C. V.
dc.date.accessioned 2017-03-21T01:30:49Z
dc.date.accessioned 2017-03-21T01:30:49Z
dc.date.accessioned 2014-02-17T06:17:52Z
dc.date.accessioned 2019-07-08T02:16:01Z
dc.date.available 2017-03-21T01:30:49Z
dc.date.available 2017-03-21T01:30:49Z
dc.date.available 2014-02-17T06:17:52Z
dc.date.available 2019-07-08T02:16:01Z
dc.date.issued 2014-01-20
dc.identifier.citation Jones HJ, Swadling KM, Butler ECV, Macleod CK (2014) Complex patterns in fish - sediment mercury concentrations in a contaminated estuary: The influence of selenium co-contamination? Estuarine, Coastal and Shelf Science 137: 14-22 en_US
dc.identifier.issn 0272-7714
dc.identifier.uri http://epubs.aims.gov.au/11068/10145
dc.description.abstract Environmental mercury (Hg) loads do not always correspond to Hg concentrations in resident fish and selenium (Se) presence has been reported to play a pivotal role in mitigating Hg bioaccumulation. Total mercury (THg), methylmercury (MeHg) and Se concentrations were measured in sediments and a benthic fish species (Platycephalus bassensis) from a contaminated estuary (Derwent Estuary, Tasmania). Elevated sediment concentrations of Se did not result in increased Se concentrations in fish, but low concentrations of Se were associated with increased MeHg bioavailability (% MeHg) from sediments to fish. Where MeHg (approximate to 99% of total Hg) concentration in fish was high Se uptake also increased, indicating that maintaining positive Se:Hg ratios may reduce the toxicity of MeHg. MeHg was detectable in sediments throughout the estuary, and a molar excess of THg over Se suggested that there was insufficient Se to prevent methylation from the sediments. Se:Hg ratios of less than 1.0 in sediments, coupled with high %MeHg fraction and high biotic sediment accumulation factors for MeHg (BSAF(meHg)), indicated that the lower region of the Derwent Estuary could be a hotspot for Hg methylation, despite having significantly lower THg concentrations. In contrast, Hg bioavailability to fish from sediments close to the source may be reduced by both inorganic Hg species complexation and lower methylation rates. There was a strong association between THg and Se in estuarine sediments, suggesting that Se plays an important role in sediment Hg cycling and should be a key consideration in any future assessments of Hg methylation, bioavailability and bioaccumulation. (C) 2013 Elsevier Ltd. All rights reserved.
dc.description.uri http://www.sciencedirect.com/science/article/pii/S0272771413005167 en_US
dc.language English
dc.language.iso en en_US
dc.publisher Elsevier en_US
dc.relation.ispartof Null
dc.subject Food Webs
dc.subject Methylmercury
dc.subject Bioavailability
dc.subject Biomagnification
dc.subject Accumulation
dc.subject San-francisco Bay
dc.subject Organisms
dc.subject Biotic Sediment Accumulation Factors
dc.subject Platycephalus Bassensis
dc.subject Derwent Estuary
dc.subject Marine & Freshwater Biology
dc.subject Se:hg Ratios
dc.subject Oceanography
dc.subject Bioaccumulation
dc.subject Tissue
dc.title Complex patterns in fish - sediment mercury concentrations in a contaminated estuary: The influence of selenium co-contamination?
dc.type journal article en_US
dc.identifier.doi 10.1016/j.ecss.2013.11.024
dc.identifier.wos WOS:000331507000002


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