Microbial taxa related to natural hydrogen and methane emissions in serpentinite-hosted hyperalkaline springs of New Caledonia.

ABSTRACT: The southeastern part of New Caledonia main island (Grande Terre) is the location of a large ophiolitic formation that hosts several hyperalkaline springs discharging high pH (∼11) and warm (<40°C) fluids enriched in methane (CH₄) and hydrogen (H₂). These waters are produced by the serpentinization of the ultrabasic rock formations. Molecular surveys had previously revealed the prokaryotic diversity of some of these New Caledonian springs, especially from the submarine chimneys of Prony Bay hydrothermal field. Here we investigate the microbial community of hyperalkaline waters from on-land springs and their relationships with elevated concentrations of dissolved H₂ (21.1-721.3 μmol/L) and CH₄ (153.0-376.6 μmol/L). 16S rRNA gene analyses (metabarc

SUBMITTER: Quemeneur M 

PROVIDER: S-EPMC10359428 | biostudies-literature | 2023

REPOSITORIES: biostudies-literature