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Phylogenetic tree of ammonia-oxidizing bacteria OTUs classified from amoA reads at 95% similarity. OTU label colors indicate OTUs found in Lake Okeechobee (green), St. Lucie Estuary (blue), or both systems (black). Numbers in parenthesis indicate the number of OTUs present from each station. Nodes with branch length <0.05. Some nodes were further collapsed for clarity.
