Biplot of the dbRDA results when apparent phylogenetic distances (16S OTUs) among samples were measured using the unweighted UniFrac distance measure. Ellipses represent the 95% confidence interval around group centroids. Arrows indicate the contribution of individual taxa to the dbRDA axes, and only those taxa with the largest contributions are shown. In dbRDA the axis explains variation while being constrained to account for group differences (or, while being forced to illustrate how groups differ). CON = Control, 10 C = 10% Corn, 5S = 5% Sorghum, 10S = 10% Sorghum, 15S = 15% Sorghum.