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Geochemical and Dietary Drivers of Mercury Bioaccumulation in Estuarine Benthic Invertebrates
Umeå University, Faculty of Science and Technology, Department of Chemistry. Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). Department of Environmental Science, Stockholm University, Stockholm, Sweden.
Umeå University, Faculty of Science and Technology, Department of Chemistry.
Umeå University, Faculty of Science and Technology, Umeå Marine Sciences Centre (UMF). Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. (EcoChange; UMFpub)ORCID iD: 0000-0001-7819-9038
Department of Forest Ecology and Management, Swedish University of Agricultural Sciences, Umeå, Sweden.
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2022 (English)In: Environmental Science and Technology, ISSN 0013-936X, E-ISSN 1520-5851, Vol. 56, no 14, p. 10141-10148Article in journal (Refereed) Published
Abstract [en]

Sediments represent the main reservoir of mercury (Hg) in aquatic environments and may act as a source of Hg to aquatic food webs. Yet, accumulation routes of Hg from the sediment to benthic organisms are poorly constrained. We studied the bioaccumulation of inorganic and methylmercury (HgII and MeHg, respectively) from different geochemical pools of Hg into four groups of benthic invertebrates (amphipods, polychaetes, chironomids, and bivalves). The study was conducted using mesocosm experiments entailing the use of multiple isotopically enriched Hg tracers and simulation of estuarine systems with brackish water and sediment. We applied different loading regimes of nutrients and terrestrial organic matter and showed that the vertical localization and the chemical speciation of HgII and MeHg in the sediment, in combination with the diet composition of the invertebrates, consistently controlled the bioaccumulation of HgII and MeHg into the benthic organisms. Our results suggest a direct link between the concentration of MeHg in the pelagic planktonic food web and the concentration of MeHg in benthic amphipods and, to some extent, in bivalves. In contrast, the quantity of MeHg in benthic chironomids and polychaetes seems to be driven by MeHg accumulation via the benthic food web. Accounting for these geochemical and dietary drivers of Hg bioaccumulation in benthic invertebrates will be important to understand and predict Hg transfer between the benthic and the pelagic food web, under current and future environmental scenarios.

Place, publisher, year, edition, pages
American Chemical Society (ACS), 2022. Vol. 56, no 14, p. 10141-10148
Keywords [en]
Baltic Sea, benthic food webs, biomagnification, inorganic divalent mercury, mercury uptake, monomethylmercury
National Category
Environmental Sciences
Identifiers
URN: urn:nbn:se:umu:diva-198339DOI: 10.1021/acs.est.2c03265ISI: 000823459600001PubMedID: 35770966Scopus ID: 2-s2.0-85134720724OAI: oai:DiVA.org:umu-198339DiVA, id: diva2:1685083
Funder
Swedish Research Council, 2008-4363The Kempe Foundations, SMK-2942The Kempe Foundations, SMK-2745The Kempe Foundations, JCK-2413Umeå UniversityKnut and Alice Wallenberg Foundation, 94.160Ecosystem dynamics in the Baltic Sea in a changing climate perspective - ECOCHANGEAvailable from: 2022-08-01 Created: 2022-08-01 Last updated: 2022-08-29Bibliographically approved

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Jonsson, SofiLiem-Nguyen, VanAndersson, AgnetaLundberg, ErikBjörn, Erik

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