To quantify colony statistics, Mathematica was used to extract data from the colony images. The following procedure was used (fig. S3): First, background pixels were set to black. Second, the center of mass for the colored pixels was located along with the edge of the colony. Third, each remaining colored pixel was converted in a binary fashion to green or red, depending on the dominant RGB (red, green, blue) value. Connected clusters of red and green pixels were determined for radial cross sections of the colony. Fourth, numbers of red and green pixels in a given cross section were used to determine the statistics of the abundance of each species.

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