Temperature limits to deep subseafloor life in the Nankai Trough subduction zone.
Science
; 370(6521): 1230-1234, 2020 12 04.
Article
en En
| MEDLINE
| ID: mdl-33273103
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.
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Sedimentos Geológicos
/
Bacterias Formadoras de Endosporas
/
Calor
Idioma:
En
Revista:
Science
Año:
2020
Tipo del documento:
Article
País de afiliación:
Alemania
Pais de publicación:
Estados Unidos