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Anaerobic methane oxidation driven by microbial reduction of natural organic matter in a tropical wetland

dc.contributorAmerican Society for Microbiology
dc.creatorValenzuela Reyes, Edgardo Iván
dc.creatorPrieto Davó, Alejandra
dc.creatorLópez Lozano, Nguyen Esmeralda
dc.creatorHernández Eligio, José Alberto
dc.creatorVega Alvarado, Leticia
dc.creatorJuárez López, Katy
dc.creatorGarcía González, Ana Sarahí
dc.creatorLópez Pérez, Mercedes Guadalupe
dc.creatorCervantes Carrillo, Francisco Javier
dc.date2018-07-11T18:30:05Z
dc.date2018-07-11T18:30:05Z
dc.date2017-06
dc.date.accessioned2023-07-17T22:05:18Z
dc.date.available2023-07-17T22:05:18Z
dc.identifierValenzuela, E. I., Prieto-Davó, A., López-Lozano, N. E., Hernández-Eligio, A., Vega-Alvarado, L., Juárez, K., … Cervantes, F. J. (2017). Anaerobic Methane Oxidation Driven by Microbial Reduction of Natural Organic Matter in a Tropical Wetland. Applied and Environmental Microbiology, 83(11), e00645–17. http://doi.org/10.1128/AEM.00645-17
dc.identifierhttp://hdl.handle.net/11627/4039
dc.identifierhttp://doi.org/10.1128/AEM.00645-17
dc.identifier.urihttps://repositorioslatinoamericanos.uchile.cl/handle/2250/7544337
dc.description"Wetlands constitute the main natural source of methane on Earth due to their high content of natural organic matter (NOM), but key drivers, such as electron acceptors, supporting methanotrophic activities in these habitats are poorly understood. We performed anoxic incubations using freshly collected sediment, along with water samples harvested from a tropical wetland, amended with C-13-methane (0.67 atm) to test the capacity of its microbial community to perform anaerobic oxidation of methane (AOM) linked to the reduction of the humic fraction of its NOM. Collected evidence demonstrates that electron-accepting functional groups (e.g., quinones) present in NOM fueled AOM by serving as a terminal electron acceptor. Indeed, while sulfate reduction was the predominant process, accounting for up to 42.5% of the AOM activities, the microbial reduction of NOM concomitantly occurred. Furthermore, enrichment of wetland sediment with external NOM provided a complementary electron-accepting capacity, of which reduction accounted for similar to 100 nmol (CH4)-C-13 oxidized center dot cm(3)center dot day(1). Spectroscopic evidence showed that quinone moieties were heterogeneously distributed in the wetland sediment, and their reduction occurred during the course of AOM. Moreover, an enrichment derived from wetland sediments performing AOM linked to NOM reduction stoichiometrically oxidized methane coupled to the reduction of the humic analogue anthraquinone-2,6-disulfonate. Microbial populations potentially involved in AOM coupled to microbial reduction of NOM were dominated by divergent biota from putative AOM-associated archaea. We estimate that this microbial process potentially contributes to the suppression of up to 114 teragrams (Tg) of CH(4 center dot)year(-1) in coastal wetlands and more than 1,300 Tg center dot year(-1), considering the global wetland area."
dc.formatapplication/pdf
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 Internacional
dc.rightshttp://creativecommons.org/licenses/by-nc-nd/4.0/
dc.rightsAcceso Abierto
dc.subjectAnaerobic methane oxidation
dc.subjectHumus
dc.subjectMethanotrophy
dc.subjectWetlands
dc.subjectCIENCIAS AGROPECUARIAS Y BIOTECNOLOGÍA
dc.titleAnaerobic methane oxidation driven by microbial reduction of natural organic matter in a tropical wetland
dc.typearticle


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