FIG 6.

Phylum-level microbial community compositions in the colonized sand reactors. Each bar shows the average result from 2 to 4 reactors that received different fluid sources during the incubation experiments. Results for reactors with different fluid sources were combined for each time point during each experiment because ANOSIM showed that fluid type did not significantly influence community composition (see Table 2). Chloroplast refers to the chloroplast from eukaryotic algae; non-PS Cyanobacteria refers to nonphotosynthetic cyanobacteria from the class ML635J-21 in the Greengenes and Silva 16S rRNA gene databases.