Oligotrophic wetland sediments susceptible to shifts in microbiomes and mercury cycling with dissolved organic matter addition

Graham, Emily B.; Gabor, Rachel S.; Schooler, Shon; McKnight, Diane M.; Nemergut, Diana R.; Knelman, Joseph E.

doi:10.7717/peerj.4575

Title: Oligotrophic wetland sediments susceptible to shifts in microbiomes and mercury cycling with dissolved organic matter addition

Journal Article · Tue Apr 03 00:00:00 EDT 2018 · PeerJ

DOI:https://doi.org/10.7717/peerj.4575· OSTI ID:1437036

^[1]; Gabor, Rachel S. ^[2]; Schooler, Shon ^[3]; McKnight, Diane M. ^[4]; Nemergut, Diana R. ^[5]; Knelman, Joseph E. ^[4]

Pacific Northwest National Lab. (PNNL), Richland, WA (United States)
The Ohio State Univ., Columbus, OH (United States)
Lake Superior National Estuarine Research Reserve, Superior, WI (United States)
Univ. of Colorado, Boulder, CO (United States)
Univ. of Colorado, Boulder, CO (United States); Duke Univ., Durham, NC (United States)

Recent advances have allowed for greater investigation into microbial regulation of mercury toxicity in the environment. In wetlands in particular, dissolved organic matter (DOM) may influence methylmercury (MeHg) production both through chemical interactions and through substrate effects on microbiomes. We conducted microcosm experiments in two disparate wetland environments (oligotrophic unvegetated and high-C vegetated sediments) to examine the impacts of plant leachate and inorganic mercury loadings (20 mg/L HgCl₂) on microbiomes and MeHg production in the St. Louis River Estuary. Our research reveals the greater relative capacity for mercury methylation in vegetated over unvegetated sediments. Further, our work shows how mercury cycling in oligotrophic unvegetated sediments may be susceptible to DOM inputs in the St. Louis River Estuary: unvegetated microcosms receiving leachate produced substantially more MeHg than unamended microcosms. We also demonstrate (1) changes in microbiome structure towardsClostridia, (2) metagenomic shifts toward fermentation, and (3) degradation of complex DOM; all of which coincide with elevated net MeHg production in unvegetated microcosms receiving leachate. Together, our work shows the influence of wetland vegetation in controlling MeHg production in the Great Lakes region and provides evidence that this may be due to both enhanced microbial activity as well as differences in microbiome composition.

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Research Organization:: Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-76RL01830

OSTI ID:: 1437036

Alternate ID(s):: OSTI ID: 1528944

Report Number(s):: PNNL-SA-120643

Journal Information:: PeerJ, Vol. 6; ISSN 2167-8359

Publisher:: PeerJ Inc.Copyright Statement

Country of Publication:: United States

Language:: English

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Cited by: 8 works

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Title: Oligotrophic wetland sediments susceptible to shifts in microbiomes and mercury cycling with dissolved organic matter addition

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