Figure 3.

Principal coordinates analysis (PCoA) plot on the unweighted UniFrac distance matrix generated from rarefied taxon abundances and depicting patterns of beta diversity for protistan communities of soil. Points that are closer together on the ordination have communities that are more similar. permutational multivariate analysis of variance indicated that differences between communities mapped according to site CMI classes were highly significant (P<0.001). Sites where community composition was highly similar despite large geographic separation are highlighted with arrows indicating (A) Antarctic Dry Valleys (black; EB24 and EB26) and Mojave Desert (gray; MD4 and MD5) of California, USA and (B) Peru (black; PE7) and Puerto Rico (gray; LQ3).