FIG. 1.

Phylogenetic tree for bacteria belonging to the Roseobacter group and representative bacteria not belonging to this group. Sequences whose designations begin with the prefixes GAI and GAC are isolates and 16S rDNA clones, respectively, obtained from southeastern United States seawater. The shaded boxes indicate strains characterized in this study. The tree is based on positions 50 to 410 (E. coli numbering) of the 16S rRNA gene and is unrooted; Hirschia baltica is the outgroup. Bootstrap values greater than 50% are indicated. The bar indicates a Jukes-Cantor distance of 0.05.