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dc.contributor.authorSinger, Michael Bliss
dc.contributor.authorHarrison, Lee R.
dc.contributor.authorDonovan, Patrick M.
dc.contributor.authorBlum, Joel D.
dc.contributor.authorMarvin-DiPasquale, Mark
dc.date.accessioned2017-03-18T00:33:05Z
dc.date.available2017-03-18T00:33:05Z
dc.date.issued2016-10-15
dc.identifier.citationSinger , M B , Harrison , L R , Donovan , P M , Blum , J D & Marvin-DiPasquale , M 2016 , ' Hydrologic indicators of hot spots and hot moments of mercury methylation potential along river corridors ' Science of the Total Environment , vol. 568 , pp. 697-711 . https://doi.org/10.1016/j.scitotenv.2016.03.005en
dc.identifier.issn0048-9697
dc.identifier.otherPURE: 241386989
dc.identifier.otherPURE UUID: 908cc17f-a21a-42d9-9b93-9c97653e06e9
dc.identifier.otherScopus: 84961223875
dc.identifier.urihttp://hdl.handle.net/10023/10489
dc.identifier.urihttp://www.sciencedirect.com/science/article/pii/S0048969716304296#appd001en
dc.descriptionThe authors acknowledge financial support from the National Science Foundation: EAR-1226741 (to M.B.S.) and EAR-1225630 (to J.D.B.), and from the REG Trust (to M.B.S.).en
dc.description.abstractThe biogeochemical cycling of metals and other contaminants in river-floodplain corridors is controlled by microbial activity responding to dynamic redox conditions. Riverine flooding thus has the potential to affect speciation of redox-sensitive metals such as mercury (Hg). Therefore, inundation history over a period of decades potentially holds information on past production of bioavailable Hg. We investigate this within a Northern California river system with a legacy of landscape-scale 19th century hydraulic gold mining. We combine hydraulic modeling, Hg measurements in sediment and biota, and first-order calculations of mercury transformation to assess the potential role of river floodplains in producing monomethylmercury (MMHg), a neurotoxin which accumulates in local and migratory food webs. We identify frequently inundated floodplain areas, as well as floodplain areas inundated for long periods. We quantify the probability of MMHg production potential (MPP) associated with hydrology in each sector of the river system as a function of the spatial patterns of overbank inundation and drainage, which affect long-term redox history of contaminated sediments. Our findings identify river floodplains as periodic, temporary, yet potentially important, loci of biogeochemical transformation in which contaminants may undergo change during limited periods of the hydrologic record. We suggest that inundation is an important driver of MPP in river corridors and that the entire flow history must be analyzed retrospectively in terms of inundation magnitude and frequency in order to accurately assess biogeochemical risks, rather than merely highlighting the largest floods or low-flow periods. MMHg bioaccumulation within the aquatic food web in this system may pose a major risk to humans and waterfowl that eat migratory salmonids, which are being encouraged to come up these rivers to spawn. There is a long-term pattern of MPP under the current flow regime that is likely to be accentuated by increasingly common large floods with extended duration.en
dc.format.extent15en
dc.language.isoeng
dc.relation.ispartofScience of the Total Environmenten
dc.rightsCopyright © 2016 Elsevier B.V. All rights reserved. This work is made available online in accordance with the publisher’s policies. This is the author created, accepted version manuscript following peer review and may differ slightly from the final published version. The final published version of this work is available at https://dx.doi.org/10.1016/j.scitotenv.2016.03.005en
dc.subjectFlood risken
dc.subjectHyporheic flowen
dc.subjectCaliforniaen
dc.subjectYubaen
dc.subjectContaminationen
dc.subjectFood websen
dc.subjectQD Chemistryen
dc.subjectNDASen
dc.subject.lccQDen
dc.titleHydrologic indicators of hot spots and hot moments of mercury methylation potential along river corridorsen
dc.typeJournal articleen
dc.description.versionPostprinten
dc.contributor.institutionUniversity of St Andrews. Earth and Environmental Sciencesen
dc.contributor.institutionUniversity of St Andrews. Scottish Oceans Instituteen
dc.identifier.doihttps://doi.org/10.1016/j.scitotenv.2016.03.005
dc.description.statusPeer revieweden
dc.date.embargoedUntil17-03-20


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