Fig. 2.

Community composition of biofilms in the Richmond Mine. (A) Layout of Richmond mine tunnel system with indication of the sampling locations (gray dots). Each pie diagram represents FISH data for that sample, numbered as in Table S2 and listed chronologically (left to right, up to down) for each sampling location. Numbers next to the sampling locations indicate estimates for the fraction of the total flow at the mine outlet that passes at that point. Black segments indicate archaeal data were not available for these samples. Examples of FISH imaging for samples 11, 14, 17, and 20 are presented in (B), (C), (D), and (E), respectively (purple, Leptospirillum group II UBA; yellow, Leptospirillum group II five-way; red, other Leptospirilla).