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Shifts in mercury methylation across a peatland chronosequence: From sulfate reduction to methanogenesis and syntrophy
Umeå University, Faculty of Science and Technology, Department of Chemistry.
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2020 (English)In: Journal of Hazardous Materials, ISSN 0304-3894, E-ISSN 1873-3336, Vol. 387, article id 121967Article in journal (Refereed) Published
Abstract [en]

Peatlands are globally important ecosystems where inorganic mercury is converted to bioaccumulating and highly toxic methylmercury, resulting in high risks of methylmercury exposure in adjacent aquatic ecosystems. Although biological mercury methylation has been known for decades, there is still a lack of knowledge about the organisms involved in mercury methylation and the drivers controlling their methylating capacity. In order to investigate the metabolisms responsible for mercury methylation and methylmercury degradation as well as the controls of both processes, we studied a chronosequence of boreal peatlands covering fundamentally different biogeochemical conditions. Potential mercury methylation rates decreased with peatland age, being up to 53 times higher in the youngest peatland compared to the oldest. Methylation in young mires was driven by sulfate reduction, while methanogenic and syntrophic metabolisms became more important in older systems. Demethylation rates were also highest in young wetlands, with a gradual shift from biotic to abiotic methylmercury degradation along the chronosequence. Our findings reveal how metabolic shifts drive mercury methylation and its ratio to demethylation as peatlands age.

Place, publisher, year, edition, pages
Elsevier, 2020. Vol. 387, article id 121967
Keywords [en]
Mercury, Methylation, Demethylation, Peatland, Chronosequence
National Category
Forest Science
Identifiers
URN: urn:nbn:se:umu:diva-169099DOI: 10.1016/j.jhazmat.2019.121967ISI: 000514758500003PubMedID: 31901845OAI: oai:DiVA.org:umu-169099DiVA, id: diva2:1415902
Available from: 2020-03-20 Created: 2020-03-20 Last updated: 2020-03-20Bibliographically approved

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Björn, Erik

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