FN Archimer Export Format PT J TI Novel microbial communities of the Haakon Mosby mud volcano and their role as a methane sink BT AF NIEMANN, H LOSEKANN, T DE BEER, D ELVERT, M NADALIG, T KNITTEL, K AMANN, R SAUTER, E SCHLUTER, M KLAGES, M FOUCHER, Jean-Paul BOETIUS, A AS 1:1,2;2:1;3:1;4:1;5:3;6:1;7:1;8:2;9:2;10:2;11:3;12:4; FF 1:;2:;3:;4:;5:;6:;7:;8:;9:;10:;11:PDG-DOP-DCB-GM-LGG;12:; C1 Max Planck Inst Marine Microbiol, D-28359 Bremen, Germany. Alfred Wegener Inst Polar & Marine Res, D-27515 Bremerhaven, Germany. IFREMER, Ctr Brest, F-29280 Plouzane, France. Int Univ Bremen, D-28759 Bremen, Germany. C2 INST MAX PLANCK (MARINE MICROBIOL), GERMANY INST A WEGENER, GERMANY IFREMER, FRANCE UNIV BREMEN, GERMANY SI BREST SE PDG-DOP-DCB-GM-LGG IN WOS Ifremer jusqu'en 2018 copubli-europe IF 26.681 TC 418 UR https://archimer.ifremer.fr/doc/2006/publication-4514.pdf LA English DT Article AB Mud volcanism is an important natural source of the greenhouse gas methane to the hydrosphere and atmosphere(1,2). 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 ocean(6-8). Unfortunately, global methane emission from active submarine mud volcanoes cannot be quantified because their number and gas release are unknown(9). 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 degrees N, 14 degrees 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 <40% of the total flux. PY 2006 PD OCT SO Nature (depuis 1997) SN 0028-0836 PU Nature VL 443 IS 7113 UT 000241362700051 BP 854 EP 858 DI 10.1038/nature05227 ID 4514 ER EF