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Figure 3. Partitioning the variation in bacterial communities’ composition of coral tissue (a) and skeleton (d) explained by host skeletal architecture, phylogeny, and reproductive mode. Adjusted R² are given. CCA biplot represents the tissue (b) and skeletal (c) microbiome structure according to each explanatory variable. Arrows represent quantitative explanatory variables Skeletal Architecture, Phylogeny PV1, 2, and 3, with arrowheads indicating the direction of increase. Categorical explanatory variables Broadcast Spawners, Brooders, and Mixed Mode are positioned on the biplot according to their coordinates. All the explanatory variables in both cca biplots were highly significant (p < 0.001). In variation partitioning analysis (a, d) total explained and unexplained variance can exceed 100%.