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Shifts in mercury methylation across a peatland chronosequence: From sulfate reduction to methanogenesis and syntrophy

Hu, Haiyan and Wang, Baolin and Bravo, Andrea G. and Bjorn, Erik and Skyllberg, Ulf and Amouroux, David and Tessier, Emmanuel and Zopfi, Jakob and Feng, Xinbin and Bishop, Kevin and Nilsson, Mats and Bertilsson, Stefan (2020). Shifts in mercury methylation across a peatland chronosequence: From sulfate reduction to methanogenesis and syntrophy. Journal of Hazardous Materials. 387 , 1-9
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Abstract

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.

Authors/Creators:Hu, Haiyan and Wang, Baolin and Bravo, Andrea G. and Bjorn, Erik and Skyllberg, Ulf and Amouroux, David and Tessier, Emmanuel and Zopfi, Jakob and Feng, Xinbin and Bishop, Kevin and Nilsson, Mats and Bertilsson, Stefan
Title:Shifts in mercury methylation across a peatland chronosequence: From sulfate reduction to methanogenesis and syntrophy
Year of publishing :2020
Volume:387
Page range:1-9
Number of Pages:9
Publisher:Elsevier
ISSN:0304-3894
Language:English
Publication Type:Journal article
Article category:Scientific peer reviewed
Version:Published version
Copyright:Creative Commons: Attribution-Noncommercial-No Derivative Works 4.0
Full Text Status:Public
Subjects:(A) Swedish standard research categories 2011 > 1 Natural sciences > 105 Earth and Related Environmental Sciences > Environmental Sciences (social aspects to be 507)
Keywords:Mercury, Methylation, Demethylation, Peatland, Chronosequence
URN:NBN:urn:nbn:se:slu:epsilon-p-104966
Permanent URL:
http://urn.kb.se/resolve?urn=urn:nbn:se:slu:epsilon-p-104966
Additional ID:
Type of IDID
DOI10.1016/j.jhazmat.2019.121967
Web of Science (WoS)000514758500003
ID Code:16808
Faculty:NJ - Fakulteten för naturresurser och jordbruksvetenskap
S - Faculty of Forest Sciences
Department:(NL, NJ) > Dept. of Aquatic Sciences and Assessment
(S) > Dept. of Forest Ecology and Management
Deposited By: SLUpub Connector
Deposited On:27 Apr 2020 13:24
Metadata Last Modified:27 Apr 2020 13:24

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