FIG. 2.

Phylogenetic relationships based on 16S rDNA sequences of representative strains G, E, and W from the Gulf of Mexico and the most closely related species found in RDP, release 5.0. Environmental clone FL5 is an rDNA clone amplified from free-living bacteria in the marine water column (8). This tree was the most parsimonious tree generated with PAUP, version 3.0s (56). Branch and bound unweighted search bootstrap values are shown near the clades; only values greater than 50% are shown. Scale bar = approximately 0.01 change per nucleotide position.