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Seasonal regime shift in the viral communities of a permafrost thaw lake

Girard Catherine, Langlois Valérie, Vigneron Adrien, Vincent Warwick F. et Culley Alexander I.. (2020). Seasonal regime shift in the viral communities of a permafrost thaw lake. Viruses, 12, (11), p. 1204-1218.

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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.

Type de document:Article publié dans une revue avec comité d'évaluation
Pages:p. 1204-1218
Version évaluée par les pairs:Oui
Identifiant unique:10.3390/v12111204
Sujets:Sciences naturelles et génie > Sciences appliquées > Climatologie et météorologie
Sciences naturelles et génie > Sciences appliquées > Eau et environnement
Sciences naturelles et génie > Sciences naturelles > Biologie et autres sciences connexes
Département, module, service et unité de recherche:Départements et modules > Département des sciences fondamentales
Mots-clés:permafrost, thermokarst pond, phage diversity, seasonality, uncultured viral genomes, pergélisol, étang thermokarstique, diversité, saisonnière, génomes viraux non cultivés
Déposé le:26 juill. 2021 13:29
Dernière modification:26 juill. 2021 13:29
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