Chemosynthetic habitats generated by different fluid flow rates, including transport of methane, as well as the sulphide resulting from anaerobic oxidation of methane (AOM), are colonized by different fauna. Left: free-living, sulphur-oxidizing bacteria mats (e.g., Beggiatoa spp.) in sediments with highest fluxes. Centre: vesicomyid clams (e.g., Calyptogena spp.) in sediments with high-to-moderate fluxes. Right: solemyid…