High hydrostatic pressure stimulates microbial nitrate reduction in hadal trench sediments under oxic conditions.

ABSTRACT: Hadal trenches are extreme environments situated over 6000 m below sea surface, where enormous hydrostatic pressure affects the biochemical cycling of elements. Recent studies have indicated that hadal trenches may represent a previously overlooked source of fixed nitrogen loss; however, the mechanisms and role of hydrostatic pressure in this process are still being debated. To this end, we investigate the effects of hydrostatic pressure (0.1 to 115 MPa) on the chemical profile, microbial community structure and functions of surface sediments from the Mariana Trench using a Deep Ocean Experimental Simulator supplied with nitrate and oxygen. We observe enhanced denitrification activity at high hydrostatic pressure under oxic conditions, while the anaerobic ammonium oxidation - a previously

SUBMITTER: Yang N 

PROVIDER: S-EPMC10951307 | biostudies-literature | 2024 Mar

REPOSITORIES: biostudies-literature