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In an acid mining lake (pH 2.6) enclosure experiments were performed with the addition of different concentrations of organic carbon, nitrogen and phosphorus. SSCP-community fingerprints, based on 16S rRNA gene amplicons, were performed to monitor changes in the structure of the total bacterial community and the sulfate reducing bacteria (SRB) in the mesocosms. Total bacterial cell counts, as assessed by epifluorescence microscopy, were increased in the mesocosms amended with organic carbon. The addition of carbon also increased the number of abundant bacterial taxa substantially along depth. Sulfate reducing bacteria (SRB) could be detected in all enclosures and all parts of the water column. These SRB belonged to genus Desulfobacter as indicated by coroborating molecular data.