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DNA copy numbers of the 16S rRNA genes of Acidithiobacillus spp. (⧫), Acidithiobacillus caldus (◣), Leptospirillum spp. ( ), Sulfobacillus spp. (×), Geobacteraceae (▵), the dsrA gene of sulfate reducers (□), and the 18S rRNA gene of Eukarya (○) in samples from mine waste tailings located in Selebi-Phikwe, Botswana (A and B); Kristineberg, Sweden (C and D); and Freiberg, Germany (E and F). Note different zones and depth scales. dw, dry weight.
