The possible occurrence of iron-dependent anaerobic methane oxidation in an Archean Ocean analogue
Roland, Fleur A. E. (Université de Liège)
Borges, Alberto V. (Université de Liège)
Darchambeau, François (Université de Liège)
Llirós, Marc (Universitat Autònoma de Barcelona. Departament de Genètica i de Microbiologia)
Morana, Cédric (Katholieke Universiteit Leuven (KU Leuven). Department of Earth and Environmental Sciences)

Fecha:	2021
Resumen:	In the ferruginous and anoxic early Earth oceans, photoferrotrophy drove most of the biological production before the advent of oxygenic photosynthesis, but its association with ferric iron (Fe 3+) dependent anaerobic methane (CH) oxidation (AOM) has been poorly investigated. We studied AOM in Kabuno Bay, a modern analogue to the Archean Ocean (anoxic bottom waters and dissolved Fe concentrations > 600 µmol L −1). Aerobic and anaerobic CH oxidation rates up to 0. 12 ± 0. 03 and 51 ± 1 µmol L −1 d −1, respectively, were put in evidence. In the Fe oxidation-reduction zone, we observed high concentration of Bacteriochlorophyll e (biomarker of the anoxygenic photoautotrophs), which co-occurred with the maximum CH oxidation peaks, and a high abundance of Candidatus Methanoperedens, which can couple AOM to Fe 3+ reduction. In addition, comparison of measured CH oxidation rates with electron acceptor fluxes suggest that AOM could mainly rely on Fe 3+ produced by photoferrotrophs. Further experiments specifically targeted to investigate the interactions between photoferrotrophs and AOM would be of considerable interest. Indeed, ferric Fe 3+ -driven AOM has been poorly envisaged as a possible metabolic process in the Archean ocean, but this can potentially change the conceptualization and modelling of metabolic and geochemical processes controlling climate conditions in the Early Earth.
Ayudas:	European Commission 240002
Nota:	Altres ajuts: Fonds pour la Formation à la Recherche dans l'Industrie et dans l'Agriculture ; Fonds De La Recherche Scientifique - FNRS, X.3007.17
Derechos:	Aquest document està subjecte a una llicència d'ús Creative Commons. Es permet la reproducció total o parcial, la distribució, la comunicació pública de l'obra i la creació d'obres derivades, fins i tot amb finalitats comercials, sempre i quan es reconegui l'autoria de l'obra original.
Lengua:	Anglès
Documento:	Article ; recerca ; Versió publicada
Materia:	Biogeochemistry ; Limnology
Publicado en:	Scientific reports, Vol. 11 (january 2021) , ISSN 2045-2322

DOI: 10.1038/s41598-021-81210-x
PMID: 33452366

11 p, 2.1 MB

El registro aparece en las colecciones:
Artículos > Artículos de investigación
Artículos > Artículos publicados