scholarly journals The Influence of Sediment‐Derived Dissolved Organic Matter in the Vistula River Estuary/Gulf of Gdansk

2019 ◽  
Vol 124 (1) ◽  
pp. 115-126 ◽  
Author(s):  
Heather E. Reader ◽  
Franziska Thoms ◽  
Maren Voss ◽  
Colin A. Stedmon
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
River Estuary ◽  
Gulf Of Gdańsk ◽  
Vistula River ◽  
Gulf Of Gdansk

Distribution of dissolved organic matter in the Pearl River Estuary, China

2004 ◽  
Vol 89 (1-4) ◽  
pp. 211-224 ◽  
Author(s):  
Julie Callahan ◽  
Minhan Dai ◽  
Robert F Chen ◽  
Xiaolin Li ◽  
Zhongming Lu ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
River Estuary ◽  
Pearl River Estuary ◽  
Pearl River ◽  
The Pearl River Estuary ◽  
The Pearl River

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

PeerJ ◽  
2018 ◽  
Vol 6 ◽  
pp. e4575 ◽  
Author(s):  
Emily B. Graham ◽  
Rachel S. Gabor ◽  
Shon Schooler ◽  
Diane M. McKnight ◽  
Diana R. Nemergut ◽  
...  
Keyword(s):  
Organic Matter ◽  
Dissolved Organic Matter ◽  
Inorganic Mercury ◽  
River Estuary ◽  
Great Lakes Region ◽  
Mercury Toxicity ◽  
Mercury Cycling ◽  
Microbiome Composition ◽  
Relative Capacity ◽  
Organic Matter Addition

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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