24 research outputs found
Temperature limits to deep subseafloor life in the Nankai Trough subduction zone
No embargo required.Microorganisms in marine subsurface sediments substantially contribute to global biomass. Sediments warmer than 40°C account for roughly half the marine sediment volume, but the processes mediated by microbial populations in these hard-to-access environments are poorly understood. We investigated microbial life in up to 1.2-kilometer-deep and up to 120°C hot sediments in the Nankai Trough subduction zone. Above 45°C, concentrations of vegetative cells drop two orders of magnitude and endospores become more than 6000 times more abundant than vegetative cells. Methane is biologically produced and oxidized until sediments reach 80° to 85°C. In 100° to 120°C sediments, isotopic evidence and increased cell concentrations demonstrate the activity of acetate-degrading hyperthermophiles. Above 45°C, populated zones alternate with zones up to 192 meters thick where microbes were undetectable.</jats:p
Hunting tactics of the lemon shark, Negaprion brevirostris, in shallow waters of an oceanic insular area in the western equatorial Atlantic
Physicochemical and biological controls of sulfide accumulation in a high temperature oil reservoir
Microbial abundance and activity at IODP Site C0023, Nankai Trough subduction zone
This data set documents data for a publication currently under consideration at Science. It documents data obtained for IODP Site C0023 during IODP Expedition 370. The data include: concentration of microbial cells and concentration of endospores in sediments, concentration and isotopic composition of methane and acetate in interstitial waters