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Dendrograms showing similarities among RISA bacterial fingerprints of biofilm communities after 2, 6, and 20 days of incubation of gravel-based microcosms: control (no amendments), FeCl3 (1,000 mg liter−1 Fe3+), FeCl3+NaN3 (1,000 mg liter−1 Fe3+ with 2% NaN3), and AlCl3 (2,500 mg liter−1 Al3+). Each dendrogram is based on amplicon band patterns from one RISA gel.
