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Cited by 308

The DOI matches its Crossref record; 53 of the 53 references it cites were found in a registry or an index.

Methanogens: Principal Methylators of Mercury in Lake Periphyton

Hamelin, Stéphanie, Amyot, Marc, Barkay, Tamar, Wang, Yanping, Planas, Dolors·2011·Environmental Science & Technology
DOI 10.1021/es2010072
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Abstract

Mercury methylation and demethylation rates were measured in periphyton biofilms growing on submerged plants from a shallow fluvial lake located along the St. Lawrence River (Quebec, Canada). Incubations were performed in situ within macrophytes beds using low-level spikes of (199)HgO and Me(200)Hg stable isotopes as tracers. To determine which microbial guilds are playing a role in these processes, methylation/demethylation experiments were performed in the absence and presence of different metabolic inhibitors: chloramphenicol (general bacteriostatic inhibitor), molybdate (sodium molybdate, a sulfate reduction inhibitor), BESA (2-bromoethane sulfonic acid, a methanogenesis inhibitor), and DCMU (3-(3,4-dichlorophenyl)-1,1 dimethyl urea, a photosynthesis inhibitor). Active microbes of the periphytic consortium were also characterized using 16S rRNA gene sequencing. Methylation rates in the absence of inhibitors varied from 0.0015 to 0.0180 d(-1) while demethylation rates ranged from 0.083 to 0.217 d(-1), which corresponds to a net methylmercury balance of -0.51 to 1.28 ng gDW periphyton(-1) d(-1). Methylation rates were significantly decreased by half by DCMU and chloramphenicol, totally inhibited by BESA, and were highly stimulated by molybdate. This suggests that methanogens rather than sulfate reducing bacteria were likely the primary methylators in the periphyton of a temperate fluvial lake, a conclusion supported by the detection of 16S rRNA gene sequences that were closely related to those of methanogens. This first clear demonstration of methanogens' role in mercury methylation in environmental periphyton samples expands the known diversity of microbial guilds that contribute to the formation of the neurotoxic substance methylmercury.

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Metadata

Authors
Hamelin, S., Amyot, M., Barkay, T., Wang, Y., & Planas, D.
Venue
Environmental Science & Technology
Publisher
American Chemical Society (ACS)
Published
2011-08-29
Volume
45
Issue
18
Pages
7693-7700
ISSN
  • 0013-936X (ISSN-L)
  • 1520-5851
DOI
10.1021/es2010072
OpenAlex
W2323128186
Cited by
308
References
53
FWCI
12.65
Type
journal article
Language
en
Open access
closed

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