show Abstracthide AbstractComparative genomics of novel Alkaliphilus species isolated from carbonate chimneys a shallow marine serpentinized site, the Prony Hydrothermal Field, New Caledonia.Culture-based approaches of representative isolates, allowing detailed and reproducible physiological and genomic studies constitutes a key step in understanding the ecophysiological properties of these extremophiles, that is how they adapted to such harsh conditions and how their metabolic activities potentially interact with the geochemistries of their environments. The present proposal aims to sequence the genome of the first alkaliphilic bacteria representative of marine serpentinization-driven ecosystem.