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In this study, we identified the major microbial guilds responsible for Hg methylation along a trophic gradient composed of two sites and three different types of wetlands: a bog\u2013fen peatland gradient and a black alder swamp, serving as net sources and a sink for methylmercury respectively. Iron\u2010reducing bacteria in the\n                    <jats:italic>Geobacteraceae<\/jats:italic>\n                    were important Hg methylators across all wetlands and seasons examined, as evidenced by abundant 16S rRNA and\n                    <jats:italic>hgcA<\/jats:italic>\n                    transcripts clustering with this family. Molybdate inhibited Hg methylation more efficiently in the peatlands than in the swamp, suggesting an increasing role of sulfate\u2010reducing bacteria and\/or related syntrophs in the methylation of Hg with decreasing trophic status. Sulfate addition failed to increase Hg methylation rates in the peatlands, suggesting that SRBs\/syntrophs were instead likely metabolizing alternative substrates such as syntrophic fermentation of organic compounds with methanogens. These results highlight the interconnectivity of anaerobic metabolism and importance of community dynamics on the methylation of Hg in wetlands with different trophic status.\n                  <\/jats:p>","DOI":"10.1111\/1462-2920.15134","type":"journal-article","created":{"date-parts":[[2020,6,18]],"date-time":"2020-06-18T23:51:21Z","timestamp":1592524281000},"page":"3685-3699","update-policy":"https:\/\/doi.org\/10.1002\/crossmark_policy","source":"Crossref","is-referenced-by-count":37,"title":["Anaerobic guilds responsible for mercury methylation in boreal wetlands of varied trophic status serving as either a methylmercury source or sink"],"prefix":"10.1111","volume":"22","author":[{"ORCID":"https:\/\/orcid.org\/0000-0002-9916-8078","authenticated-orcid":false,"given":"Jeffra K","family":"Schaefer","sequence":"first","affiliation":[{"name":"Department of Environmental Sciences Rutgers University  14 College Farm Road, New Brunswick NJ 08901 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