Fig. 1

Dissolved inorganic carbon (DIC) fixation in the bathypelagic prokaryotic community amended with ammonia (10 µM), sulfite (1 µM), thiosulfate (1 µM), thiosulfate + DOM (1 µM thiosulfate + 10 µM glucose + 10 µM acetate), DOM (10 µM glucose + 10 µM acetate), and the unamended control (control) after 72 h incubation. The bars represent the average ± standard error of three replicate bottles