Fig. 1.

Phylogenetic distribution of pool environment bacterial rRNA genes. Clone sequences were grouped phylogenetically to accompany the text discussion, and percentages of sequences associated with the indicated groups are shown as pie charts. (A) Pool air, February. (B) Pool water, February. (C) Sand filter, December. (D) Pool air, August. (E) Outside air, August. (F) Pool water and side biofilm, August. Mycobacteria, Mycobacterium spp.; Actinob, Actinobacteria; other Actinob, Actinobacteria excluding mycobacteria; Sphingom, Sphingomonadaceae; α-Proteobact, α-proteobacteria; other α-Proteobact, α-proteobacteria excluding Sphingomonadaceae; β-Proteobact, β-proteobacteria; γ-Proteobact, γ-proteobacteria; δ-Proteobact, δ-proteobacteria; Cyanobact, Cyanobacteria; Bcl/Cls-grp, Bacillus/Clostridium group; Bct/Chl-grp, Bacteroidetes/Chlorobi group; other bacteria, bacteria not included in other groups.