Dendrogram analysis based upon ThetaYC index of bacteria found on the skin of the 86 brook charr individuals.

Groups are defined with the Weighted Unifrac distance. The first and second groups are composed of closely related bacterial communities. The third group is an assemblage of dissimilar communities and is considered as an outgroup. The most differentiated groups are groups 1 and 3 (Unifrac Score: 0.710811, p<0.0010) followed by the distance between groups 2 and 3 (Unifrac Score: 0.685361, p<0.0010), and the distance between groups 1 and 2 (Unifrac Score: 0.401674, p<0.0010).