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Research article2016Peer reviewedOpen access

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

Roiha, Toni; Peura, Sari; Cusson, Mathieu; Rautio, Milla

Abstract

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.

Published in

Scientific Reports
2016, Volume: 6, article number: 34456Publisher: NATURE PUBLISHING GROUP

    UKÄ Subject classification

    Oceanography, Hydrology, Water Resources

    Publication identifier

    DOI: https://doi.org/10.1038/srep34456

    Permanent link to this page (URI)

    https://res.slu.se/id/publ/89877