FIG. 7.

Neighbor-joining maximum likelihood tree of arrA gene sequences (112 bp) retrieved from Mono Lake, enrichment experiments, mixed cultures, and isolates. The numbered (1 to 48) clades represent groups of sequences that are >99% similar. The stacked bars represent the percentages of arrA sequences from each treatment type in that clade; the total number of sequences in each treatment type is given. The scale bar indicates distance. Bootstrap values of >50% (100 iterations) are shown. The tree is unrooted; the molybdopterin binding subunit of molybdopterin oxidoreductase from Wolinella succinogenes strain DSMZ 1740 is the outgroup.