Bacterial Diversity of Historical Iron-Containing Water Sources in the Kaliningrad Region

Kaliningrad region has a rich historical heritage, including several water sources with high iron content, known since the end of 19th century. They are rich in divalent iron, which is oxidized by bacterial communities. They include many different taxonomic groups of bacteria. In this paper, for the first time, the microbial communities of iron-bearing springs in the Kaliningrad region were profiled, and 6 samples were taken from four geographical locations during the study. The results of profiling revealed taxonomic groups belonging to phylum: Acidobacteriota, Desulfobacteriota, Cyanobacteriia, Proteobacteria, Nitrospirota, and among the predominant groups stands out a gamma-proteobacterium of the genus Gallionella.