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Allochthonous carbon is a major regulator to bacterial growth and community composition in subarctic freshwaters

Roiha Toni, Peura Sari, Cusson Mathieu et Rautio Milla. (2016). Allochthonous carbon is a major regulator to bacterial growth and community composition in subarctic freshwaters. Scientific Reports, 6, (34456), p. 1-12.

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URL officielle: http://dx.doi.org/doi:10.1038/srep34456

Résumé

In the subarctic region, climate warming and permafrost thaw are leading to emergence of ponds and to an increase in mobility of catchment carbon. As carbon of terrestrial origin is increasing in subarctic freshwaters the resource pool supporting their microbial communities and metabolism is changing, with consequences to overall aquatic productivity. By sampling different subarctic water bodies for a one complete year we show how terrestrial and algal carbon compounds vary in a range of freshwaters and how differential organic carbon quality is linked to bacterial metabolism and community composition. We show that terrestrial drainage and associated nutrients supported higher bacterial growth in ponds and river mouths that were influenced by fresh terrestrial carbon than in large lakes with carbon from algal production. Bacterial diversity, however, was lower at sites influenced by terrestrial carbon inputs. Bacterial community composition was highly variable among different water bodies and especially influenced by concentrations of dissolved organic carbon (DOC), fulvic acids, proteins and nutrients. Furthermore, a distinct preference was found for terrestrial vs. algal carbon among certain bacterial tribes. The results highlight the contribution of the numerous ponds to cycling of terrestrial carbon in the changing subarctic and arctic regions.

Type de document:Article publié dans une revue avec comité d'évaluation
Volume:6
Numéro:34456
Pages:p. 1-12
Version évaluée par les pairs:Oui
Date:2016
Sujets: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:carbon cycle, freshwater ecology, microbial ecology, subarctic freshwaters
Déposé le:30 mars 2017 02:05
Dernière modification:30 mars 2017 02:05
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