FIG. 2.

Phylogenetic tree for marine archaea inferred from DNAdist and a neighbor-joining analysis by using 631 bp (E. coli positions 45 to 737). One clone of each OTU is shown on the tree. OTUs that appear only in GenBank clones are shaded. The affiliations of the clones of Fuhrman et al. are indicated on the right (the four sequences most similar to OTU I-CD are pB1-47, pB1-80, pB1-124, and pB1-151; the five sequences most similar to OTU I-ED are pB1-22, NH49-8, nH49-14, p712-12, and p712-24; the eight sequences most similar to OTU I-GD are NH25-1, NH25-13, NH49-4, NH49-9, pB1-53, pB1-123, pN1-56, and p712-37; and the four sequences most similar to OTU I-KD are pB1-92, pN1-10, pN1-27, and pN1-43). Bootstrap values (percentages) for the neighbor-joining and maximum-likelihood analyses are indicated for the most significant nodes. Scale bar = 0.10 change per sequence position.