Impact of Bacterial NO 3 Transport on Sediment Biogeochemistry

Abstract
Experiments demonstrated that Beggiatoa could induce a H 2 S-depleted suboxic zone of more than 10 mm in marine sediments and cause a divergence in sediment NO 3 reduction from denitrification to dissimilatory NO 3 reduction to ammonium. pH, O 2 , and H 2 S profiles indicated that the bacteria oxidized H 2 S with NO 3 and transported S 0 to the sediment surface for aerobic oxidation.