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Institut de recherche pour la conservation des zones humides méditerranéennes

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Titre :	Methane oxidation pathways and associated methanotrophic communities in the water column of a tropical lake
Auteurs :	Prosper K. Zigah, Auteur ; Kirsten Oswald, Auteur ; Andreas Brand, Auteur ; Christian Dinkel, Auteur ; Bernhard Wehrli, Auteur ; Carsten J. Schubert, Auteur
Type de document :	Article
Dans :	Limnology and Oceanography (60(2) MAR 2015)
Article en page(s) :	553-572
Résumé :	We examined methane (CH4) oxidation pathways and associated methanotrophic communities in the water column of Lake Kivu using abundance and isotopic compositions of CH4 and phospholipid fatty acids (PLFA), distributions of glycerol dialkyl glycerol tetraethers, and catalyzed reporter deposition fluorescence in situ hybridization (CARD-FISH) analysis. The carbon isotopic data of CH4 indicate that aerobic CH4 oxidation is the predominant pathway of microbial CH4 consumption with an isotopic fractionation factor () of 1.022-1.038. A small amount of CH4 is oxidized anaerobically, with an of 1.002-1.006. Aerobic CH4 oxidation is mediated by type II methane-oxidizing bacteria (type II MOB) based on the C-13 depletion (C-13 of -40.5 parts per thousand to -43.7 parts per thousand) of diagnostic C18:17 fatty acids in the surface waters. CARD-FISH images and PLFA components C16:17 and C16:15 indicate the presence of type I MOB in the methane and nutrient-rich deep-water region. C-13 depletion of C16:17 and C16:15 (C-13, approximate to -40 parts per thousand to -50.6 parts per thousand) in the lake water below 52 m suggests the involvement of type I MOB in methane oxidation in the anoxic deep-water regions of the lake. A novel cluster of anaerobic methane-oxidizing archaea (ANME) rather than the known ANME-1 and ANME-2 appear to be involved in anaerobic oxidation of methane (AOM). Sulfate reducing bacteria are associated with AOM in the lake based on the C-13 depletion (C-13, -38.2 parts per thousand to -45.0 parts per thousand) of anteiso-methyl-C15:0 fatty acid. Methane constitutes an important carbon and energy source (up to 38%) for the heterotrophic and autotrophic communities in the lake.

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