Anaerobic oxidation of methane mediated by a syntrophic microbial consortium above marine gas hydrate (Cascadia continental margin, NE-Pacific) *Boetius.

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Presentation transcript:

Anaerobic oxidation of methane mediated by a syntrophic microbial consortium above marine gas hydrate (Cascadia continental margin, NE-Pacific) *Boetius A, Elvert M, Nauhaus K, Ravenschlag K, Schubert C, Treude T, Witte U Max Planck Institute for Marine Microbiology, Bremen, Germany *Alfred Wegener Institute for Polar and Marine Research, Bremerhaven, Germany Rickert, D GEOMAR Research Center for Marine Geosciences, Kiel, Germany MUMM Methane in Gas Hydrate Bearing Sediments – Turnover Rates and Microorganisms

Cascadia subduction zone: Hydrate Ridge 780 m water depth

gas hydrate GEOMAR

Beggiatoa mat GEOMAR

Calyptogena field GEOMAR

Carbonate structure GEOMAR/ALVIN

CH 4 + SO 4 2-  HCO HS - + H 2 O Where does all the sulfide come from?... anaerobic oxidation of methane!

Boetius et al. 2000, NATURE 407,p A marine microbial consortium apparently mediating anaerobic oxidation of methane Methane:  13 C:-50 to -70‰ Archaeal Lipids:  13 C: <-100‰ (Archeol, Hydroxyarcheol, Crocetan, PMI) SRB Lipids/Alcohols:  13 C: <-70‰ (iso- /antiso- C 15 /C 17 fatty acids) >90% of total microbial biomass (>10^10 cells/ccm)

Boetius et al. 2000, NATURE 407,p A marine microbial consortium apparently mediating anaerobic oxidation of methane Archaea Probe BA2H SRB Probe DSS658 5 µm

AOM rates FROM: K.U. Hinrichs & A. Boetius (2001, in press) The anaerobic oxidation of methane: New insights in microbial ecology and biogeochemistry a Jørgensen (1983) b Suess et al. (1999) total sinks 688 Tg CH4

sulfate reduction rates integrated SRR (mmol/m 2 /d; 0-10 cm):

number of SRB/archaea-aggregates integrated total cell numbers (cells/cm -2 ; 0-10 cm): 2.1* * *10 10

aggregate size spectrum Average Size 3.2±1  m Archaea = 100 cells SRB = 200 cells 5  m

Calcification? CH 4 + SO 4 2-  HCO HS - + H 2 O 10  m 1 m

outlook

aggregate size spectrum 5  m A. Gieseke, MPI

mineral precipitates T. Neu., UFZ Magdeburg

mineral precipitates T. Neu., UFZ Magdeburg

Anaerobic Oxidation of Methane Reference Calyptogena field. Beggiatoa mat

Project MUMM