Figure S4. Model assessment of the relationship between alpha diversity of native species (a and c) and diversity of both native and alien species (b and d) with mean annual precipitation across the three main islands. Values of the model estimates (i.e., slopes) and their corresponding uncertainties; we show 85% and 95% as the width of confidence intervals for the model’s estimates. Confidence intervals that do not overlap with the vertical dotted line indicating 0 effect, are considered statistically significant. Estimates comparison using Hawai’i island as reference (a and b) and estimates comparison using Maui Nui complex island as reference (c and d).