Examples of indicator taxa between community classes. Indicator taxa driving the differentiation of community classes were identified using the indval function in the labdsv package in R. Boxplots are labeled according to the dominant taxa in the community class. (A-D) The colors represent different community classes. The relative abundances of dominant taxa (y-axis) in each community class are plotted for the type I habitat left retroauricular crease (A), and the type II habitat anterior nares (B), stool (C), and subgingival plaque (D). In (D), the name of the community classes are designated as a generic term, cluster 1 or cluster 2, because of the very low silhouette value (<0.2).