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Novel microbial communities of the Haakon Mosby mud volcano and their role as a methane sink

Niemann, H. and Lösekann, T. and de Beer, D. and Elvert, M. and Nadalig, T. and Knittel, K. and Amann, R. and Sauter, E. J. and Schlüter, M. and Klages, M. and Foucher, J. P. and Boetius, A.. (2006) Novel microbial communities of the Haakon Mosby mud volcano and their role as a methane sink. Nature, 443. pp. 854-858.

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Abstract

Mud volcanism is an important natural source of the greenhouse gas methane to the hydrosphere and atmosphere1, 2. Recent investigations show that the number of active submarine mud volcanoes might be much higher than anticipated (for example, see refs 3?5), and that gas emitted from deep-sea seeps might reach the upper mixed ocean6, 7, 8. Unfortunately, global methane emission from active submarine mud volcanoes cannot be quantified because their number and gas release are unknown9. It is also unclear how efficiently methane-oxidizing microorganisms remove methane. Here we investigate the methane-emitting Haakon Mosby Mud Volcano (HMMV, Barents Sea, 72° N, 14° 44' E; 1,250 m water depth) to provide quantitative estimates of the in situ composition, distribution and activity of methanotrophs in relation to gas emission. The HMMV hosts three key communities: aerobic methanotrophic bacteria (Methylococcales), anaerobic methanotrophic archaea (ANME-2) thriving below siboglinid tubeworms, and a previously undescribed clade of archaea (ANME-3) associated with bacterial mats. We found that the upward flow of sulphate- and oxygen-free mud volcano fluids restricts the availability of these electron acceptors for methane oxidation, and hence the habitat range of methanotrophs. This mechanism limits the capacity of the microbial methane filter at active marine mud volcanoes to
Faculties and Departments:05 Faculty of Science > Departement Umweltwissenschaften > Umweltgeowissenschaften > Geochemie Stoffkreisläufe (Lehmann)
UniBasel Contributors:Niemann, Helge
Item Type:Article, refereed
Article Subtype:Research Article
Bibsysno:Link to catalogue
Publisher:Macmillan
ISSN:0028-0836
Note:Publication type according to Uni Basel Research Database: Journal article
Language:English
Identification Number:
Last Modified:26 Sep 2017 06:20
Deposited On:22 Mar 2012 14:18

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