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

Publication name

 JOURNAL OF HAZARDOUS MATERIALS Volume: 387 Article Number: 121967 DOI: 10.1016/j.jhazmat.2019.121967 Published: APR 5 2020


 Hu, Haiyan; Wang, Baolin; Bravo, Andrea G.; Bjorn, Erik; Skyllberg, Ulf; Amouroux, David; Tessier, Emmanuel; Zopfi, Jakob; Feng, Xinbin; Bishop, Kevin; Nilsson, Mats B.; Bertilsson, Stefan

Corresponding author(s) 

 HU Haiyan 
 Chinese Acad Sci, Inst Geochem, State Key Lab Environm Geochem, Guiyang 550081, Peoples R China.

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