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Allochthonous carbon is a major regulator to bacterial growth and community composition in subarctic freshwaters
Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland;Département des sciences fondamentales, Université du Québec à Chicoutimi, Chicoutimi, Quebec, Canada..
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland.
Département des sciences fondamentales, Université du Québec à Chicoutimi, Chicoutimi, Quebec, Canada..
Department of Biological and Environmental Science, University of Jyväskylä, Jyväskylä, Finland;Département des sciences fondamentales, Université du Québec à Chicoutimi, Chicoutimi, Quebec, Canada.;Centre for Northern Studies (CEN), Laval University, Quebec City, Quebec, Canada.;Group for Interuniversity Research in Limnology and aquatic environment (GRIL), University of Montreal, Montreal, Quebec, Canada..
2016 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 6, 34456Article in journal (Refereed) Published
Abstract [en]

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.

Place, publisher, year, edition, pages
2016. Vol. 6, 34456
National Category
Ecology Environmental Sciences
Identifiers
URN: urn:nbn:se:uu:diva-304314DOI: 10.1038/srep34456ISI: 000391988600001PubMedID: 27686416OAI: oai:DiVA.org:uu-304314DiVA: diva2:1015064
Note

De två första författarna bidrog till arbetet i lika stor utsträckning.

Available from: 2016-10-04 Created: 2016-10-04 Last updated: 2017-11-30Bibliographically approved

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