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Role of organic matter and microbial communities in mercury retention and methylation in sediments near run-of-river hydroelectric dams.

Author(s): Millera Ferriz L, Ponton DE, Storck V, Leclerc M, Bilodeau F, Walsh DA, Amyot M

Run-of-river power plants (RoRs) are expected to triple in number over the next decades in Canada. These structures are not anticipated to considerably promote the mobilization and transport of mercury (Hg) and its subsequent microbial transformation to met...

Article GUID: 33609815
A large-scale assessment of lakes reveals a pervasive signal of land use on bacterial communities.

Author(s): Kraemer SA, Barbosa da Costa N, Shapiro BJ, Fradette M, Huot Y, Walsh DA

ISME J. 2020 Aug 07;: Authors: Kraemer SA, Barbosa da Costa N, Shapiro BJ, Fradette M, Huot Y, Walsh DA

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Modelling Free-Living and Particle-Associated Bacterial Assemblages across the Deep and Hypoxic Lower St. Lawrence Estuary.

Author(s): Cui TT, Dawson TJ, McLatchie S, Dunn K, Bielawski J, Walsh DA

mSphere. 2020 May 20;5(3): Authors: Cui TT, Dawson TJ, McLatchie S, Dunn K, Bielawski J, Walsh DA

Article GUID: 32434843
Diversity and biogeography of SAR11 bacteria from the Arctic Ocean.

Author(s): Kraemer S, Ramachandran A, Colatriano D, Lovejoy C, Walsh DA

ISME J. 2019 Sep 09;: Authors: Kraemer S, Ramachandran A, Colatriano D, Lovejoy C, Walsh DA

Article GUID: 31501503
The NSERC Canadian Lake Pulse Network: A national assessment of lake health providing science for water management in a changing climate.

Author(s): Huot Y, Brown CA, Potvin G, Antoniades D, Baulch HM, Beisner BE, Bélanger S, Brazeau S, Cabana H, Cardille JA, Del Giorgio PA, Gregory-Eaves...

Sci Total Environ. 2019 Aug 04;695:133668 Authors: Huot Y, Brown CA, Potvin G, Antoniades D, Baulch HM, Beisner BE, Bélanger S, Brazeau S, Cabana H, Cardille JA, Del Giorgio PA, Gregory-Eaves...

Article GUID: 31419692
Genomic evidence for the degradation of terrestrial organic matter by pelagic Arctic Ocean Chloroflexi bacteria.

Author(s): Colatriano D, Tran PQ, Guéguen C, Williams WJ, Lovejoy C, Walsh DA

Commun Biol. 2018;1:90 Authors: Colatriano D, Tran PQ, Guéguen C, Williams WJ, Lovejoy C, Walsh DA

Article GUID: 30271971
BioMiCo: a supervised Bayesian model for inference of microbial community structure.

Author(s): Shafiei M, Dunn KA, Boon E, MacDonald SM, Walsh DA, Gu H, Bielawski JP

Microbiome. 2015;3:8 Authors: Shafiei M, Dunn KA, Boon E, MacDonald SM, Walsh DA, Gu H, Bielawski JP

Article GUID: 25774293
A compendium of multi-omic sequence information from the Saanich Inlet water column.

Author(s): Hawley AK, Torres-Beltrán M, Zaikova E, Walsh DA, Mueller A, Scofield M, Kheirandish S, Payne C, Pakhomova L, Bhatia M, Shevchuk O, Gies EA,...

Sci Data. 2017 10 31;4:170160 Authors: Hawley AK, Torres-Beltrán M, Zaikova E, Walsh DA, Mueller A, Scofield M, Kheirandish S, Payne C, Pakhomova L, Bhatia M, Shevchuk O, Gies EA, Fairley D, ...

Article GUID: 29087368
A compendium of geochemical information from the Saanich Inlet water column.

Author(s): Torres-Beltrán M, Hawley AK, Capelle D, Zaikova E, Walsh DA, Mueller A, Scofield M, Payne C, Pakhomova L, Kheirandish S, Finke J, Bhatia M, ...

Sci Data. 2017 10 31;4:170159 Authors: Torres-Beltrán M, Hawley AK, Capelle D, Zaikova E, Walsh DA, Mueller A, Scofield M, Payne C, Pakhomova L, Kheirandish S, Finke J, Bhatia M, Shevchuk O, ...

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Microbial life under ice: Metagenome diversity and in situ activity of Verrucomicrobia in seasonally ice-covered Lakes.

Author(s): Tran P, Ramachandran A, Khawasik O, Beisner BE, Rautio M, Huot Y, Walsh DA

Environ Microbiol. 2018 Jul;20(7):2568-2584 Authors: Tran P, Ramachandran A, Khawasik O, Beisner BE, Rautio M, Huot Y, Walsh DA

Article GUID: 29921005
Progress and Challenges in Ocean Metaproteomics and Proposed Best Practices for Data Sharing.

Author(s): Saito MA, Bertrand EM, Duffy ME, Gaylord DA, Held NA, Hervey WJ, Hettich RL, Jagtap PD, Janech MG, Kinkade DB, Leary DH, McIlvin MR, Moore E...

J Proteome Res. 2019 Apr 05;18(4):1461-1476 Authors: Saito MA, Bertrand EM, Duffy ME, Gaylord DA, Held NA, Hervey WJ, Hettich RL, Jagtap PD, Janech MG, Kinkade DB, Leary DH, McIlvin MR, Moore EK, ...

Article GUID: 30702898
Annual nitrification dynamics in a seasonally ice-covered lake.

Author(s): Massé S, Botrel M, Walsh DA, Maranger R

PLoS One. 2019;14(3):e0213748 Authors: Massé S, Botrel M, Walsh DA, Maranger R

Article GUID: 30893339
Author Correction: A compendium of geochemical information from the Saanich Inlet water column.

Author(s): Torres-Beltrán M, Hawley AK, Capelle D, Zaikova E, Walsh DA, Mueller A, Scofield M, Payne C, Pakhomova L, Kheirandish S, Finke J, Bhatia M, ...

Sci Data. 2019 01 15;6(1):1 Authors: Torres-Beltrán M, Hawley AK, Capelle D, Zaikova E, Walsh DA, Mueller A, Scofield M, Payne C, Pakhomova L, Kheirandish S, Finke J, Bhatia M, Shevchuk O, Gi...

Article GUID: 30647409
Title:Role of organic matter and microbial communities in mercury retention and methylation in sediments near run-of-river hydroelectric dams.
Authors:Millera Ferriz L,  Ponton DE,  Storck V,  Leclerc M,  Bilodeau F,  Walsh DA,  Amyot M
Link:https://www.ncbi.nlm.nih.gov/pubmed/33609815
DOI:10.1016/j.scitotenv.2021.145686
Category:Sci Total Environ
PMID:33609815
Dept Affiliation: BIOLOGY
1 Département de sciences biologiques, Université de Montréal, Montreal H2V 2S9, QC, Canada; Biology Department, Concordia University, Montreal H4B 1R6, QC, Canada; GRIL, Groupe de Recherche Interuniversitaire en Limnologie, Département de sciences biologiques, Université de Montréal, Campus MIL, Montreal H3C 3J7, QC, Canada.
2 Département de sciences biologiques, Université de Montréal, Montreal H2V 2S9, QC, Canada; GRIL, Groupe de Recherche Interuniversitaire en Limnologie, Département de sciences biologiques, Université de Montréal, Campus MIL, Montreal H3C 3J7, QC, Canada.
3 Département de sciences biologiques, Université de Montréal, Montreal H2V 2S9, QC, Canada; Biology Department, Concordia University, Montreal H4B 1R6, QC, Canada.
4 Hydro-Québec Production, Environment Department, Montreal, QC, Canada.
5 Biology Department, Concordia University, Montreal H4B 1R6, QC, Canada; GRIL, Groupe de Recherche Interuniversitaire en Limnologie, Département de sciences biologiques, Université de Montréal, Campus MIL, Montreal H3C 3J7, QC, Canada.
6 Département de sciences biologiques, Université de Montréal, Montreal H2V 2S9, QC, Canada; GRIL, Groupe de Recherche Interuniversitaire en Limnologie, Département de sciences biologiques, Université de Montréal, Campus MIL, Montreal H3C 3J7, QC, Canada. Electronic address: m.amyot@umontreal.ca.

Description:

Role of organic matter and microbial communities in mercury retention and methylation in sediments near run-of-river hydroelectric dams.

Sci Total Environ. 2021 Feb 06; 774:145686

Authors: Millera Ferriz L, Ponton DE, Storck V, Leclerc M, Bilodeau F, Walsh DA, Amyot M

Abstract

Run-of-river power plants (RoRs) are expected to triple in number over the next decades in Canada. These structures are not anticipated to considerably promote the mobilization and transport of mercury (Hg) and its subsequent microbial transformation to methylmercury (MeHg), a neurotoxin able to biomagnify in food webs up to humans. To test whether construction of RoRs had an effect on Hg transport and transformation, we studied Hg and MeHg concentrations, organic matter contents and methylating microbial community abundance and composition in the sediments of a section of the St. Maurice River (Quebec, Canada). This river section has been affected by the construction of two RoR dams and its watershed has been disturbed by a forest fire, logging, and the construction of wetlands. Higher total Hg (THg) and MeHg concentrations were observed in the surface sediments of the flooded sites upstream of the RoRs. These peaks in THg and MeHg were correlated with organic matter proportions in the sediments (r2 = 0.87 and 0.82, respectively). In contrast, the proportion of MeHg, a proxy for methylation potential, was best explained by the carbon to nitrogen ratio suggesting the importance of terrigenous organic matter as labile substrate for Hg methylation in this system. Metagenomic analysis of Hg-methylating communities based on the hgcA functional gene marker indicated an abundance of methanogens, sulfate reducers and fermenters, suggesting that these metabolic guilds may be primary Hg methylators in these surface sediments. We propose that RoR pondages act as traps for sediments, organic matter and Hg, and that this retention can be amplified by other disturbances of the watershed such as forest fire and logging. RoR flooded sites can be conducive to Hg methylation in sediments and may act as gateways for bioaccumulation and biomagnification of MeHg along food webs, particularly in disturbed watersheds.

PMID: 33609815 [PubMed - as supplied by publisher]