9:15 AM - 9:45 AM
★ [U04-01] Sub-seafloor methane biogeochemistry and unseen archaeal methanotrophic processes
Keywords:Sub-seafloor methane biogeochemistry, global methane cycle, Archaea, ANME (ANaerobic MEthanotroph)
On the other hand, the anaerobic oxidation of methane (AOM) in marine sediments is an important microbial process in the carbon cycle and also greenhouse gas emission constraints. Since the first report of 13C-depleted lipids mediated by modern anaerobic methanotrophic archaea (ANME) consortium, the molecular carbon isotopic signatures have been recognized as an indicator of ongoing microbial methanotrophy [e.g., Hinrichs et al., 1999; Elvert et al., 1999]. Cold seep ecosystems, a biological hot spot for ANME communities, is an ideal natural laboratory for the study of methane biogeochemistry and microbial anaerobic methanotrophy driven by modern ANME communities [e.g., Knittel and Boetius, 2009 and literatures therein]. Since laboratory-based culture and isolation of ANME are currently difficult, the fate of sub-seafloor 13C-depleted methane emission is still unclear on their biosynthetic pathways during anaerobic oxidation process.
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Kaneko et al., 2014. Quantitative analysis of coenzyme F430 in environmental samples: a new diagnostic tool for methanogenesis and anaerobic methane oxidation. Analytical Chemistry, 86, 3633-3638.
Knittel, K., Boetius, A., 2009. Anaerobic oxidation of methane: progress with an unknown process. Annual Review of Microbiology 63, 311-334.
Hinrichs et al., 1999. Methane-consuming archaebacteria in marine sediments. Nature, 398, 802-805.