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Trophic links between fermenters and methanogens in a moderately acidic fen soil

Title data

Wüst, Pia K. ; Horn, Marcus A. ; Drake, Harold L.:
Trophic links between fermenters and methanogens in a moderately acidic fen soil.
In: Environmental Microbiology. Vol. 11 (2009) Issue 6 . - pp. 1395-1409.
ISSN 1462-2920
DOI: https://doi.org/10.1111/j.1462-2920.2009.01867.x

Abstract in another language

Trophic links between fermentation and methanogenesis of soil derived from a methane-emitting, moderately acidic temperate fen (pH 4.5) were investigated. Initial CO2:CH4 production ratios in anoxic microcosms indicated that methanogenesis was concomitant to other terminal anaerobic processes. Methane production in anoxic microcosms at in situ pH was stimulated by supplemental H2-CO2, formate, or methanol; supplemental acetate did not stimulate methanogenesis. Supplemental H2-CO2, formate, or methanol also stimulated the formation of acetate, indicating that the fen harbors moderately acid-tolerant acetogens. Supplemental monosaccharides (glucose, N-acetylglucosamine, and xylose) stimulated the production of CO2, H2, acetate, and other fermentation products when methanogenesis was inhibited with 2-bromoethane sulfonate (BES) (20 mM). Glucose stimulated methanogenesis in the absence of BES. Upper soil depths yielded higher anaerobic activities and also higher numbers of cells. Detected archaeal 16S rRNA genes were indicative of H2-CO2- and formate-consuming methanogens (Methanomicrobiaceae), obligate acetoclastic methanogens (Methanosaetaceae), and crenarchaeotes (groups I.1a, I.1c, and I.3). Molecular analyses of partial sequences of 16S rRNA genes revealed the presence of Acidobacteria, Nitrospirales, Clamydiales, Clostridiales, Alpha-, Gamma-, Delta-Proteobacteria, and Cyanobacteria. These collective results suggest that this moderately acidic fen harbors phylogenetically diverse, moderately acid tolerant fermenters (both facultative aerobes and obligate anaerobes) that are trophically linked to methanogenesis.

Further data

Item Type: Article in a journal
Refereed: Yes
Additional notes: BAYCEER65971
Institutions of the University: Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology > Chair Ecological Microbiology
Research Institutions > Research Centres > Bayreuth Center of Ecology and Environmental Research- BayCEER
Faculties
Faculties > Faculty of Biology, Chemistry and Earth Sciences
Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Biology
Research Institutions
Research Institutions > Research Centres
Result of work at the UBT: Yes
DDC Subjects: 500 Science
Date Deposited: 29 Jul 2015 05:53
Last Modified: 29 Jul 2015 05:53
URI: https://eref.uni-bayreuth.de/id/eprint/17377