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Biogeochemical evidence of anaerobic methane oxidation on active submarine mud volcanoes on the continental slope of the Canadian Beaufort Sea

Title
Biogeochemical evidence of anaerobic methane oxidation on active submarine mud volcanoes on the continental slope of the Canadian Beaufort Sea
Author
신경훈
Keywords
ARCHAEAL LIPID BIOMARKERS; COLD SEEPS; MICROBIAL COMMUNITIES; MAXIMUM-LIKELIHOOD; CONVERGENT MARGIN; STABLE CARBON; GAS; SEDIMENTS; CONSUMPTION; OXYGEN
Issue Date
2018-12
Publisher
COPERNICUS GESELLSCHAFT MBH
Citation
BIOGEOSCIENCES, v. 15, No. 24, Page. 7419-7433
Abstract
In this study, we report lipid biomarker patterns and phylogenetic identities of key microbial communities mediating anaerobic oxidation of methane (AOM) in active mud volcanoes (MVs) on the continental slope of the Canadian Beaufort Sea. The carbon isotopic compositions (delta C-13) of sn-2- and sn-3-hydroxyarchaeol showed the highly C-13-depleted values (-114% to -82%) associated with a steep depletion in sulfate concentrations within 0.7 m of sediment depths. This suggested the presence of methanotrophic archaea involved in sulfate-dependent AOM, albeit in a small amount. The ratio of sn-2-hydroxyarchaeol to archaeol (> 1) and operational taxonomic units (OTUs) indicated that the anaerobic methanotrophic archaea (ANME) clades ANME-2c and ANME-3 were involved in AOM. Higher delta C-13 values of archaeol and biphytanes (BPs; -55.2 +/- 10.0% and -39.3 +/- 13.0 %, respectively) suggested that archaeal communities were also assimilating AOM-derived inorganic carbon. Furthermore, the distinct distribution patterns of methanotrophs in the three MVs appears to be associated with varying intensities of ascending gas fluids. Consequently, our results suggest that the niche diversification of active mud volcanoes has shaped distinct archaeal communities that play important roles in AOM in the Beaufort Sea.
URI
https://munin.uit.no/handle/10037/14425http://repository.hanyang.ac.kr/handle/20.500.11754/98979
ISSN
1726-4170; 1726-4189
DOI
10.5194/bg-15-7419-2018
Appears in Collections:
COLLEGE OF SCIENCE AND CONVERGENCE TECHNOLOGY[E](과학기술융합대학) > MARINE SCIENCE AND CONVERGENCE ENGINEERING(해양융합공학과) > Articles
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