Figure 2

Principal coordinates plot showing the overall variation in bacterial communities. Communities are compared using the Bray–Curtis distance metric. Fifty-four samples from the suburban (> 1.1 µm, red), suburban (< 1.1 µm, green), urban (> 1.1 µm, blue), and urban (< 1.1 µm, purple) were plotted with two coordinates. The mean and standard deviation for each axis are indicated by an ellipse for each sample group. Difference among four sample groups are significant (PERMANOVA, R = 0.313, p < 0.001).