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Metagenomic insights into strategies of aerobic and anaerobic carbon and nitrogen transformation in boreal lakes
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology. Uppsala University, Science for Life Laboratory, SciLifeLab.
2015 (English)In: Scientific Reports, ISSN 2045-2322, E-ISSN 2045-2322, Vol. 5, 12102Article in journal (Refereed) Published
Abstract [en]

Thousands of net-heterotrophic and strongly stratifying lakes dominate the boreal landscape. Besides their central role as emitters of greenhouse gases, we have only recently begun to understand the microbial systems driving the metabolic processes and elemental cycles in these lakes. Using shotgun metagenomics, we show that the functional potential differs among lake types, with humic lakes being particularly enriched in carbon degradation genes. Most of the metabolic pathways exhibit oxygen- and temperature-dependent stratification over depth, coinciding with shifts in bacterial community composition, implying that stratification is a major factor controlling lake metabolism. In the bottom waters, rare and poorly characterized taxa, such as epsilon-Proteobacteria, but also autotrophs, such as photolithotrophic Chlorobia were abundant. These oxygen-depleted layers exhibited high genetic potential for mineralization, but also for fixation of carbon and nitrogen, and genetic markers for both methane production and oxidation were present. Our study provides a first glimpse of the genetic versatility of freshwater anoxic zones, and demonstrates the potential for complete turnover of carbon compounds within the water column.

Place, publisher, year, edition, pages
2015. Vol. 5, 12102
National Category
Oceanography, Hydrology, Water Resources
Identifiers
URN: urn:nbn:se:uu:diva-259647DOI: 10.1038/srep12102ISI: 000357724400001PubMedID: 26159227OAI: oai:DiVA.org:uu-259647DiVA: diva2:847601
Funder
Swedish Research Council, 2012-4592Swedish Foundation for Strategic Research , ICA10-0015Swedish Research Council Formas, 2012-986
Note

Funding: Uppsala Multidisciplinary Center for Advanced Computational Science (UPPMAX) b2014083, IT Center for Science (CSC) jyy2606, Academy of Finland 265902, K&A Wallenberg foundation.

Available from: 2015-08-20 Created: 2015-08-10 Last updated: 2017-12-04Bibliographically approved

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Peura, SariSinclair, LucasBertilsson, StefanEiler, Alexander

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