These results were determined by sequencing bacterial and archaeal 16S rRNA phylogenetic marker genes.
Bacteria, particularly Proteobacteria, dominate these groundwaters. Proteobacteria are a large phylum of gram-negative bacteria that have diverse metabolisms and are found within many environments. Numerous members are capable of metabolising and transforming nitrogen.
Facts about Planctomycetes
Some members are capable of anaerobic ammonium oxidation (anammox), converting bioavailable nitrate and ammonium into N2 gas, which is returned to the atmosphere.