Principal coordinate analysis plot for all bacterial clades. Distribution of the samples in a space defined by the first two principal coordinates (PC1 and PC2). PC1 accounted for 80.7% of variance, and the samples are distributed in PC1 largely according to sampling location. PC2 accounted for a 10.1% proportion of variance between samples. DOI: https://doi.org/10.1525/elementa.350.f4