Fig. 3. The fraction of the variation in alpha and beta diversity of soil bacteria and fungi explained by environmental and spatial predictors.
The importance of individual predictor variables was assessed using multiple linear regression models of alpha (a) and beta (b) diversity, and the relative importance of soil environment variables (ENV) and spatial distance (SPAT) among samples within island was assessed using variation partitioning of bacterial (c) and fungal (d) beta diversity.