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Comparative study on bacterial carbon sources in lake sediments: the role of methanotrophy
Umeå University, Faculty of Science and Technology, Department of Ecology and Environmental Sciences. ARCUM. (Climate Impacts Research Centre (CIRC))ORCID iD: 0000-0002-4949-9792
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2015 (English)In: Aquatic Microbial Ecology, Vol. 76, no 1, 39-47 p.Article in journal (Refereed) Published
Abstract [en]

Methane-derived carbon can be important in both benthic and pelagic food webs. Either generated in the anaerobic layers of the sediment or in the anaerobic hypolimnion of stratified eutrophic lakes, methane is an excellent carbon source for aerobic methanotrophic bacteria. The very negative methane δ13C-signal in the methanotrophic biomass provides an excellent opportunity to trace the use of methane-derived carbon in food webs. We studied carbon sources of benthic bacteria in a range of Swedish lakes with different inputs of terrestrial organic carbon and indigenous primary production. We analyzed the 13C:12C ratios in phospholipid-derived fatty acids, which serve as biomarkers for specific groups of Bacteria. We demonstrate that methane is an important carbon source for sediment bacteria, not only for the methanotrophic community but also for the non-methanotrophic heterotrophic bacteria. This most likely indirect utilization of isotopically highly depleted methane masks the stable isotope signatures for terrestrial input and local primary production in the heterotrophic bacterial community.

Place, publisher, year, edition, pages
2015. Vol. 76, no 1, 39-47 p.
National Category
Natural Sciences
Identifiers
URN: urn:nbn:se:umu:diva-130872OAI: oai:DiVA.org:umu-130872DiVA: diva2:1070142
Available from: 2017-01-31 Created: 2017-01-31 Last updated: 2017-01-31

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http://www.int-res.com/abstracts/ame/v76/n1/p39-47/

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Gudasz, Cristian
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Department of Ecology and Environmental Sciences
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CiteExportLink to record
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