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Competition lowers abundance. The effect of competitor presence on bacterial densities (expressed in log10 of CFU ml−1) for (a) P. fluorescens and (b) S. marcescens, by level of KB dilution, between treatments alone and in competition. (a,b) Filled circles with solid line, in competition; open circles with dashed line, alone. Dilution levels 1 through 8 correspond to actual dilutions of 1, 3, 9, 27, 81, 243, 729, and 2187 times, respectively.
