Bacterial Diversity of Historic Iron-Containing Water Sources of the Kaliningrad Region

The Kaliningrad region has a rich historical heritage, including several water sources with high iron content. Known since the end of the 19th century, they are rich in ferrous iron, which is oxidized by bacterial communities. They include many different taxonomic groups of bacteria. In this work, for the first time, profiling of microbial communities of iron-containing sources in the Kaliningrad region was carried out; During the study, 6 samples were taken from four geographical locations. Based on the results of profiling, taxonomic groups were identified belonging to the phyla Acidobacteriota, Desulfobacteriota, Cyanobacteriota, Proteobacteria, Nitrospirota, and among the predominant groups the gammaproteobacterium of the genus Gallionella stands out.