Fig 4.

Neighbor-joining phylogenetic tree of bacterial amoA sequences from epiphytic communities of three different algal species. Representative sequences of each OTU (cutoff distance, 5%) are shown in bold, followed by the GenBank accession numbers of all the sequences in the same OTU. Origins of the sequences in each OTU are indicated with letter codes (O, O. volubilis; P, P. crispa; and L, L. rodriguezii). Bootstrap values higher than 50% are indicated at branch points (1,000 replicates). Reference sequences from the GenBank database are added.