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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
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
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
Title:Microbial life under ice: Metagenome diversity and in situ activity of Verrucomicrobia in seasonally ice-covered Lakes.
Authors:Tran P,  Ramachandran A,  Khawasik O,  Beisner BE,  Rautio M,  Huot Y,  Walsh DA
Link:https://www.ncbi.nlm.nih.gov/pubmed/29921005?dopt=Abstract
DOI:10.1111/1462-2920.14283
Category:Environ Microbiol
PMID:29921005
Dept Affiliation: BIOLOGY
1 Department of Biology, Concordia University, 7141 Sherbrooke St. West, Montreal, Quebec, H4B 1R6, Canada.
2 Groupe de Recherche Interuniversitaire en Limnologie et Environnement Aquatique (GRIL), Montréal, Québec, Canada.
3 Département des Sciences Biologiques, Université du Québec à Montréal, Montreal, Québec, Canada.
4 Département des Sciences Fondamentales, Université du Québec à Chicoutimi, Chicoutimi, Québec, Canada.
5 Département de Géomatique Appliquée, Université de Sherbrooke, Sherbrooke, Québec, Canada.

Description:

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

Environ Microbiol. 2018 Jul;20(7):2568-2584

Authors: Tran P, Ramachandran A, Khawasik O, Beisner BE, Rautio M, Huot Y, Walsh DA

Abstract

Northern lakes are ice-covered for a large part of the year, yet our understanding of microbial diversity and activity during winter lags behind that of the ice-free period. In this study, we investigated under-ice diversity and metabolism of Verrucomicrobia in seasonally ice-covered lakes in temperate and boreal regions of Quebec, Canada using 16S rRNA sequencing, metagenomics and metatranscriptomics. Verrucomicrobia, particularly the V1, V3 and V4 subdivisions, were abundant during ice-covered periods. A diversity of Verrucomicrobia genomes were reconstructed from Quebec lake metagenomes. Several genomes were associated with the ice-covered period and were represented in winter metatranscriptomes, supporting the notion that Verrucomicrobia are metabolically active under ice. Verrucomicrobia transcriptome analysis revealed a range of metabolisms potentially occurring under ice, including carbohydrate degradation, glycolate utilization, scavenging of chlorophyll degradation products, and urea use. Genes for aerobic sulfur and hydrogen oxidation were expressed, suggesting chemolithotrophy may be an adaptation to conditions where labile carbon may be limited. The expression of genes for flagella biosynthesis and chemotaxis was detected, suggesting Verrucomicrobia may be actively sensing and responding to winter nutrient pulses, such as phytoplankton blooms. These results increase our understanding on the diversity and metabolic processes occurring under ice in northern lakes ecosystems.© 2018 Society for Applied Microbiology and John Wiley & Sons Ltd.

PMID: 29921005 [PubMed - in process]