Abstract: | We identified 16S rRNA gene sequences in sediment samples from Ago Bay in Japan, forming a new branch of the anammox group or closely related to anaerobic ammonium oxidizing (anammox) bacterial sequences. Anammox activity in the sediment samples was detected by 15N tracer assays. These results, along with the results of fluorescence in situ hybridization (FISH) analysis, suggest the presence of anammox bacteria in the marine sediments. |