Methylmercury production in the anoxic hypolimnion of a Dimictic Seepage Lake

1995 ◽  
Vol 80 (1-4) ◽  
pp. 735-745 ◽  
Author(s):  
C. J. Watras ◽  
N. S. Bloom ◽  
S. A. Claas ◽  
K. A. Morrison ◽  
C. C. Gilmour ◽  
...  
Keyword(s):  
Anoxic Hypolimnion ◽  
Seepage Lake ◽  
Methylmercury Production

Methylmercury production in the Anoxic Hypolimnion of a Dimictic Seepage Lake

1995 ◽  
pp. 735-745
Author(s):  
C. J. Watras ◽  
N. S. Bloom ◽  
S. A. Claas ◽  
K. A. Morrison ◽  
C. C. Gilmour ◽  
...  
Keyword(s):  
Anoxic Hypolimnion ◽  
Seepage Lake ◽  
Methylmercury Production

Distribution and biogeochemical controls on net methylmercury production in Penobscot River marshes and sediment

2018 ◽  
Vol 640-641 ◽  
pp. 555-569 ◽  
Author(s):  
Cynthia Gilmour ◽  
James Tyler Bell ◽  
Ally Bullock Soren ◽  
Georgia Riedel ◽  
Gerhardt Riedel ◽  
...  
Keyword(s):  
Penobscot River ◽  
Methylmercury Production

Incorporating Concentration-Dependent Sediment Microbial Activity into Methylmercury Production Kinetics Modeling

2021 ◽  
Author(s):  
Grace E. Schwartz ◽  
Katherine A Muller ◽  
Saubhagya S Rathore ◽  
Regina L Wilpiszeski ◽  
Alyssa A Carrell ◽  
...  
Keyword(s):  
Gene Cluster ◽  
Microbial Activity ◽  
Inorganic Mercury ◽  
Anaerobic Microorganisms ◽  
Kinetics Modeling ◽  
Production Kinetics ◽  
Anoxic Environments ◽  
Kinetics Of ◽  
Methylmercury Production

In anoxic environments, anaerobic microorganisms carrying the hgcAB gene cluster can mediate the transformation of inorganic mercury (Hg(II)) to monomethylmercury (MMHg). The kinetics of Hg(II) transformation to MMHg in periphyton...

scholarly journals Expanded Phylogenetic Diversity and Metabolic Flexibility of Mercury-Methylating Microorganisms

mSystems ◽  
2020 ◽  
Vol 5 (4) ◽  
Author(s):  
Elizabeth A. McDaniel ◽  
Benjamin D. Peterson ◽  
Sarah L. R. Stevens ◽  
Patricia Q. Tran ◽  
Karthik Anantharaman ◽  
...  
Keyword(s):  
Phylogenetic Diversity ◽  
Large Scale ◽  
Carbon Fixation ◽  
Anaerobic Bacteria ◽  
Inorganic Mercury ◽  
Metal Resistance ◽  
Metabolic Flexibility ◽  
Metabolic Diversity ◽  
Content Type ◽  
Methylmercury Production

ABSTRACT Methylmercury is a potent bioaccumulating neurotoxin that is produced by specific microorganisms that methylate inorganic mercury. Methylmercury production in diverse anaerobic bacteria and archaea was recently linked to the hgcAB genes. However, the full phylogenetic and metabolic diversity of mercury-methylating microorganisms has not been fully unraveled due to the limited number of cultured experimentally verified methylators and the limitations of primer-based molecular methods. Here, we describe the phylogenetic diversity and metabolic flexibility of putative mercury-methylating microorganisms by hgcAB identification in publicly available isolate genomes and metagenome-assembled genomes (MAGs) as well as novel freshwater MAGs. We demonstrate that putative mercury methylators are much more phylogenetically diverse than previously known and that hgcAB distribution among genomes is most likely due to several independent horizontal gene transfer events. The microorganisms we identified possess diverse metabolic capabilities spanning carbon fixation, sulfate reduction, nitrogen fixation, and metal resistance pathways. We identified 111 putative mercury methylators in a set of previously published permafrost metatranscriptomes and demonstrated that different methylating taxa may contribute to hgcA expression at different depths. Overall, we provide a framework for illuminating the microbial basis of mercury methylation using genome-resolved metagenomics and metatranscriptomics to identify putative methylators based upon hgcAB presence and describe their putative functions in the environment. IMPORTANCE Accurately assessing the production of bioaccumulative neurotoxic methylmercury by characterizing the phylogenetic diversity, metabolic functions, and activity of methylators in the environment is crucial for understanding constraints on the mercury cycle. Much of our understanding of methylmercury production is based on cultured anaerobic microorganisms within the Deltaproteobacteria, Firmicutes, and Euryarchaeota. Advances in next-generation sequencing technologies have enabled large-scale cultivation-independent surveys of diverse and poorly characterized microorganisms from numerous ecosystems. We used genome-resolved metagenomics and metatranscriptomics to highlight the vast phylogenetic and metabolic diversity of putative mercury methylators and their depth-discrete activities in thawing permafrost. This work underscores the importance of using genome-resolved metagenomics to survey specific putative methylating populations of a given mercury-impacted ecosystem.

scholarly journals Experimental removal of wetland emergent vegetation leads to decreased methylmercury production in surface sediment

2009 ◽  
Vol 114 (G2) ◽  
pp. n/a-n/a ◽  
Author(s):  
Lisamarie Windham-Myers ◽  
Mark Marvin-Dipasquale ◽  
David P. Krabbenhoft ◽  
Jennifer L. Agee ◽  
Marisa H. Cox ◽  
...  
Keyword(s):  
Surface Sediment ◽  
Emergent Vegetation ◽  
Experimental Removal ◽  
Methylmercury Production
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