Fig. 3: Geochemical, microbial community, and gene abundance data from three cores at gas hydrate mound 5 showing steady-state sulfate-methane dynamics.
From: Distinct methane-dependent biogeochemical states in Arctic seafloor gas hydrate mounds
Sulfate-methane transition depths in centimeters below seafloor are indicated by dashed lines. a shows methane concentrations and porewater sulfate, sulfide, and alkalinity, and b indicates percent abundances of dominant bacterial and archaeal classes, dominant anaerobic methanotrophic archaeal (ANME) families, and sulfate-reducing bacterial (SRB) genera. c shows copy numbers of mcrA and dsrAB genes per gram bulk sediment, with values below the detectable limit (103 g−1) along the margin of the panel. Macroscopic translucent-to-yellow biofilms, shown as yellow symbols in panel (a), were observed at 63 and 68 cm below seafloor in gravity core GC1070 (symbol size not to scale with depth axis).
