FIG. 2.

Community metabolic richness (as measured by the number of sole carbon sources oxidized by a whole sample in Biolog GN microplates) of crushed basalt extracts under different conditions of extraction solution (first line of x-axis labels) and particle separation method (second line of x-axis labels). Pyro represents 0.1% sodium pyrophosphate; Pyro, PBS, and H₂O refer to the extractant solutions described in Materials and Methods; slow, density, and floc refer to the particle separation methods described in Materials and Methods. The values shown are means with 1 standard deviation indicated; n = 3 for each treatment combination.