Figure S9. Age range diversity within the youngest island Hawai‘i (a). The map is based on the geologic Map (Sherrod et al 2007). Box plots for taxonomic (b), phylogenetic (c) and functional (d) diversity estimation include only plots located on very wet areas (> 5000 mm/year) on Hawai’i island.
Table 1. Test of the statistical significance of the interaction term between island (i.e., age) and mean annual precipitation (MAP). Models were fitted for the three facets of alpha diversity, i.e., taxonomic (TD), phylogenetic (PD) and functional diversity (FD), including Hill numbers q=0 and q=2, and for beta diversity (beta C) for both sets of data, i.e., plots relatively uninvaded by alien species including natives species only (i.e., native species models) and all plots including invaded ones with native and alien species (i.e., native and alien species models). P-values correspond to the Likelihood Ratio Test, which we used to test the statistical significance of the interaction term between island age and precipitation. Note that all p-values are smaller than 0.05 indicating that including the interaction term improves goodness of model fit. We fitted the models using generalized linear models with gamma family and log link (see details in methods).