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Dark Carbon Fixation: An Important Process in Lake Sediments
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.
Uppsala University, Disciplinary Domain of Science and Technology, Biology, Department of Ecology and Genetics, Limnology.ORCID iD: 0000-0003-3509-8266
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2013 (English)In: PLoS ONE, ISSN 1932-6203, E-ISSN 1932-6203, Vol. 8, no 6, e65813- p.Article in journal (Refereed) Published
Abstract [en]

Close to redox boundaries, dark carbon fixation by chemoautotrophic bacteria may be a large contributor to overall carbon fixation. Still, little is known about the relative importance of this process in lake systems, in spite the potentially high chemoautotrophic potential of lake sediments. We compared rates of dark carbon fixation, bacterial production and oxygen consumption in sediments from four Swedish boreal and seven tropical Brazilian lakes. Rates were highly variable and dark carbon fixation amounted up to 80% of the total heterotrophic bacterial production. The results indicate that non-photosynthetic carbon fixation can represent a substantial contribution to bacterial biomass production, especially in sediments with low organic matter content.

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2013. Vol. 8, no 6, e65813- p.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-206468DOI: 10.1371/journal.pone.0065813ISI: 000320755400067OAI: oai:DiVA.org:uu-206468DiVA: diva2:644644
Available from: 2013-09-01 Created: 2013-08-30 Last updated: 2017-12-06Bibliographically approved

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Gudasz, CristianTranvik, Lars

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