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dc.contributor.authorRemaili, Timothy M
dc.contributor.authorYin, Naiyi
dc.contributor.authorBennett, William W
dc.contributor.authorSimpson, Stuart L
dc.contributor.authorJolley, Dianne F
dc.contributor.authorWelsh, David T
dc.date.accessioned2019-07-04T12:42:00Z
dc.date.available2019-07-04T12:42:00Z
dc.date.issued2018
dc.identifier.issn2050-7887
dc.identifier.doi10.1039/C8EM00266E
dc.identifier.urihttp://hdl.handle.net/10072/382623
dc.description.abstractIn undisturbed, metal-contaminated marine sediments, porewater metal concentrations are generally low due to their associations with strong binding phases such as organic matter, Fe/Mn (oxy)hydroxides and sulfides. Bioturbating fauna can alter redox conditions and, therefore, metal binding, potentially leading to increased metal bioavailability and subsequent toxicity to inhabiting organisms. Here we assessed the impacts of bioturbation (by bivalves and large amphipod species) on sediment biogeochemistry, metal bioaccumulation and toxicity to a smaller amphipod species in a metal contaminated sediment with low and high acid volatile sulfide (AVS) concentrations. Active bioturbation lowered metal toxicity to reproduction in the sediment with low-AVS (from 90% toxic (non-bioturbated) to 50% toxic (bioturbated)). This corresponded with lower dissolved metal concentrations in the overlying water column and lower metal bioaccumulation. Conversely, toxicity increased due to bioturbation in the sediment with high-AVS (40% toxic (non-bioturbated) to 80% toxic (bioturbated)), coinciding with sulfide oxidation, metal release and greater metal bioaccumulation. The results indicate that the AVS–SEM paradigm (commonly used to estimate the risks of adverse effects to benthic organisms in metal-contaminated sediments) may result in incorrect assessment outcomes in cases where bioturbating organisms rework and oxidize the sediment, or for those sediments where AVS has accumulated due to the inability of larger bioturbating benthic organisms to establish populations.
dc.description.peerreviewedYes
dc.languageEnglish
dc.language.isoeng
dc.publisherRoyal Society of Chemistry
dc.publisher.placeUnited Kingdom
dc.relation.ispartofpagefrom1285
dc.relation.ispartofpageto1296
dc.relation.ispartofissue9
dc.relation.ispartofjournalEnvironmental Science: Processes and Impacts
dc.relation.ispartofvolume20
dc.subject.fieldofresearchChemical sciences
dc.subject.fieldofresearchEnvironmental sciences
dc.subject.fieldofresearchOther environmental sciences not elsewhere classified
dc.subject.fieldofresearchBiomedical and clinical sciences
dc.subject.fieldofresearchcode34
dc.subject.fieldofresearchcode41
dc.subject.fieldofresearchcode419999
dc.subject.fieldofresearchcode32
dc.titleContrasting effects of bioturbation on metal toxicity of contaminated sediments results in misleading interpretation of the AVS-SEM metal-sulfide paradigm
dc.typeJournal article
dc.type.descriptionC1 - Articles
dc.type.codeC - Journal Articles
gro.facultyGriffith Sciences, School of Environment and Science
gro.hasfulltextNo Full Text
gro.griffith.authorBennett, Will W.


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