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Schematic of the key microbial players involved in Fe cycling in the acidic lignite mine Lake 77 ecosystem. Microbial players detected by isolation and 16S rRNA gene cloning included Fe(II) oxidizers and Fe(III) reducers. The oxygen content declined sharply to 0 at 2 to 10 mm below the water-sediment interface, and the pH increased from 3 in the water and the top sediment zone I to ca. 5 in zone IV.
