Figure 1.

Number of cell doublings per 7 days in the evolved communities when grown in either high CO₂ or in air. This corresponds to the time of a single transfer in the selection experiment, and was measured on a 96-well plate in the same conditions used for the selection experiment. Cell numbers were calculated from absorbance at 650 nm. The assay environment is denoted by either high (high CO₂) or ambient. The selection regime is denoted by either control, high (high CO₂) or rising (rising CO₂). In all cases, communities were first acclimated for 7 days in the assay environment used for the data shown here. Each point represents the average of eight measurements of a single independent replicate community. Standard errors for each point range from 0.04 to 0.21.