FIG 5.

Percentages of total reads of microorganisms catalyzing dissimilatory oxidation (A) and reduction (B) of iron and sulfur in layers of the NIT cover system and underlying tailings at the Kam Kotia Mine, as determined by high-throughput amplicon sequencing. Most numerous bacterial genera within each group are shown separately. IOM, iron-oxidizing microorganisms; SOM, sulfur-oxidizing microorganisms; SOM/IOM, sulfur- and iron-oxidizing microorganisms; SRB, sulfate- and sulfur-reducing bacteria. Genera that were pooled with respective higher taxa are marked with asterisks. For sample depths, see Table 3. Physiological characteristics of the detected sulfur- and/or iron-metabolizing genera are summarized in Table 2.