Keyword search (3,619 papers available)


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

Article GUID: 32770118
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, ...

Article GUID: 29087371
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:Annual nitrification dynamics in a seasonally ice-covered lake.
Authors:Massé S,  Botrel M,  Walsh DA,  Maranger R
Link:https://www.ncbi.nlm.nih.gov/pubmed/30893339?dopt=Abstract
Category:PLoS One
PMID:30893339
Dept Affiliation: BIOLOGY
1 Groupe de recherche interuniversitaire en limnologie, Département de sciences biologiques, Université de Montréal, Montréal, Québec, Canada.
2 Groupe de recherche interuniversitaire en limnologie, Department of Biology, Concordia University, Montréal, Québec, Canada.

Description:

Annual nitrification dynamics in a seasonally ice-covered lake.

PLoS One. 2019;14(3):e0213748

Authors: Massé S, Botrel M, Walsh DA, Maranger R

Abstract

We investigated the variability in ammonia oxidation (AO) rates and the presence of ammonia-oxidizing archaea and bacteria (AOB and AOA) over an annual cycle in the water column of a small, seasonnally ice covered, temperate shield lake. AO, the first step of nitrification, was measured in situ using 15N-labelled ammonium (NH4+) at 1% and 10% of photosynthetic active radiation during day and at the same depths during night. AO was active across seasons and light levels, ranging from undetectable to 333 nmol L-1 d-1 with peak activity in winter under ice cover. NH4+ concentration was the single most important positive predictor of AO rates. High NH4+ concentrations and reduced chlorophyll a concentrations under ice, which favoured AO, were coherent with high nitrate concentrations and super saturation in nitrous oxide. When targeting the ammonia monooxygenase (amoA) gene in samples from the photic zone, we found AOA to be omnipresent throughout the year while AOB were observed predominantly during winter. Our results demonstrate that AO is an ongoing process in sunlit surface waters of temperate lakes and at all seasons with pronounced nitrification activity observed during winter under ice. The combination of high NH4+ concentrations due to fall overturn, reduced light availability that limited phytoplankton competition, and the presence of AOB together with AOA apparently favoured these elevated rates under ice. We suggest that lake ice could be a control point for nitrification in oligotrophic temperate shield lakes, characterized as a moment and place that exerts disproportionate influence on the biogeochemical behaviour of ecosystems.

PMID: 30893339 [PubMed - in process]