Figure 3. Heatmap of the bacterial community composition based on 16S rRNA gene sequences for the sponge samples collected in 2014.

OTUs were clustered at 97% similarity and the lowest taxonomy classification are given. Columns are clustered based on Bray–Curtis dissimilarity using hierarchical clustering with the “average” method (scale depicts percentage of dissimilarities). Samples are indicated in purple: C. concentrica, orange: Scopalina sp., blue: seawater, and red: T. anhelans. Numbers 1, 2, and 3 indicate sample replicates.