Impact of Concurrent Aerobic-anaerobic Methanotrophy on Methane Emission from Marine Sediments in Gas Hydrate Area

Overview

Journal Environ Sci Technol

Publisher American Chemical Society

Specialty Environmental Health

Date 2024 Mar 6

PMID 38445630

Authors

Yusuke Miyajima

Tomo Aoyagi

Hideyoshi Yoshioka

Tomoyuki Hori

Hiroshi A Takahashi

Minako Tanaka

Ayumi Tsukasaki

Shusaku Goto

Masahiro Suzumura

Affiliations

Soon will be listed here.

Abstract

Microbial methane oxidation has a significant impact on the methane flux from marine gas hydrate areas. However, the environmental fate of methane remains poorly constrained. We quantified the relative contributions of aerobic and anaerobic methanotrophs to methane consumption in sediments of the gas hydrate-bearing Sakata Knoll, Japan, by geochemical and microbiological analyses coupled with C-tracer incubation experiments. The anaerobic ANME-1 and ANME-2 species contributed to the oxidation of 33.2 and 1.4% methane fluxes at 0-10 and 10-22 cm below the seafloor (bsf), respectively. Although the aerobic Methylococcaceae species consumed only 0.9% methane flux in the oxygen depleted 0.0-0.5 cmbsf zone, their metabolic activity was sustained down to 6 cmbsf (based on rRNA and lipid biosyntheses), increasing their contribution to 10.3%. Our study emphasizes that the co-occurrence of aerobic and anaerobic methanotrophy at the redox transition zone is an important determinant of methane flux.

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