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Article

Seasonal Regime Shift in the Viral Communities of a Permafrost Thaw Lake

by 1,2,3,4,†, 1,2,3,4, 2,3,4,5, 2,3,4,5 and 1,2,3,4,*
1
Département de Biochimie, de Microbiologie et de Bio-Informatique, Université Laval, Québec, QC G1V 0A6, Canada
2
Centre d’études Nordiques (CEN), Université Laval, Québec, QC G1V 0A6, Canada
3
Institut de Biologie Intégrative et des Systèmes (IBIS), Université Laval, Québec, QC G1V 0A6, Canada
4
Takuvik Joint International Laboratory, Université Laval, Québec, QC G1V 0A6, Canada
5
Département de Biologie, Université Laval, Québec, QC G1V 0A6, Canada
*
Author to whom correspondence should be addressed.
Current address: Département des Sciences Fondamentales, Centre d’études Nordiques, Université du Québec à Chicoutimi, Chicoutimi, QC G7H 2B1, Canada.
Viruses 2020, 12(11), 1204; https://doi.org/10.3390/v12111204
Received: 22 September 2020 / Accepted: 20 October 2020 / Published: 22 October 2020
(This article belongs to the Special Issue Viruses of Aquatic Ecosystems)
Permafrost thaw lakes including thermokarst lakes and ponds are ubiquitous features of Subarctic and Arctic landscapes and are hotspots of microbial activity. Input of terrestrial organic matter into the planktonic microbial loop of these lakes may greatly amplify global greenhouse gas emissions. This microbial loop, dominated in the summer by aerobic microorganisms including phototrophs, is radically different in the winter, when metabolic processes shift to the anaerobic degradation of organic matter. Little is known about the viruses that infect these microbes, despite evidence that viruses can control microbial populations and influence biogeochemical cycling in other systems. Here, we present the results of a metagenomics-based study of viruses in the larger than 0.22 µm fraction across two seasons (summer and winter) in a permafrost thaw lake in Subarctic Canada. We uncovered 351 viral populations (vOTUs) in the surface waters of this lake, with diversity significantly greater during the summer. We also identified and characterized several phage genomes and prophages, which were mostly present in the summer. Finally, we compared the viral community of this waterbody to other habitats and found unexpected similarities with distant bog lakes in North America. View Full-Text
Keywords: permafrost; thermokarst pond; phage diversity; seasonality; uncultured viral genomes permafrost; thermokarst pond; phage diversity; seasonality; uncultured viral genomes
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MDPI and ACS Style

Girard, C.; Langlois, V.; Vigneron, A.; Vincent, W.F.; Culley, A.I. Seasonal Regime Shift in the Viral Communities of a Permafrost Thaw Lake. Viruses 2020, 12, 1204. https://doi.org/10.3390/v12111204

AMA Style

Girard C, Langlois V, Vigneron A, Vincent WF, Culley AI. Seasonal Regime Shift in the Viral Communities of a Permafrost Thaw Lake. Viruses. 2020; 12(11):1204. https://doi.org/10.3390/v12111204

Chicago/Turabian Style

Girard, Catherine, Valérie Langlois, Adrien Vigneron, Warwick F. Vincent, and Alexander I. Culley 2020. "Seasonal Regime Shift in the Viral Communities of a Permafrost Thaw Lake" Viruses 12, no. 11: 1204. https://doi.org/10.3390/v12111204

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