FIG. 1.

Maximum-likelihood tree of sponge-associated cyanobacteria based on 16S rRNA. Bootstrap values above 50% are indicated. Sponge-associated cyanobacteria (which were named following their host species) are indicated in bold. The group numbers follow Honda et al. (8) and Robertson et al. (10). The triangle at the top represents group 6, detailed in Fig. 2. The individual identification number is given at the end of the sequence; different letters represent different clones obtained for the same sponge individual. Sequences from this work are indicated by a star after the accession number. The sampling localities of sponge-associated cyanobacteria are indicated by bars: AU, Australia; BH, Bahamas; GU, Guam; JP, Japan; MX, Mexican Pacific; NZ, New Zealand; ZZ, Zanzibar.