TABLE I.  Environmental models selected after the application of multi-model selection criteria to account for the geographic variation in morphological diversity (MDiv) and species richness (SR).

	MDiv
	Model 1			Model 2			SR
Environmental variables	b	p		b	p		b	p
Potential evapotranspiration	-	-		0.024	0.105		0.154	0.000
Mean annual temperature	0.477	0.000		0.467	0.000		-	-
Mean altitude	0.141	0.000		0.139	0.000		-	-
Mean precipitation	-	-		-	-		-0.295	0.000
Actual evapotranspiration	-	-		-	-		-	-
Colwell’s precipitation predictability index	0.163	0.000		0.173	0.000		-	-
Mean standard deviation altitude	0.098	0.000		0.109	0.000		0.103	0.000
Coefficient of variation in temperature	-	-		-	-		-0.392	0.000
Coefficient of variation in precipitation	0.025	0.008		-	-		-0.197	0.000
Number of ecoregions	-0.065	0.000		-0.068	0.000		-	-
Distance of each cell in the grid map to major rivers	-0.126	0.000		-0.124	0.000		-0.108	0.000
Deserts and xeric shrublands	-0.242	0.000		-0.240	0.000		-0.226	0.000
Flooded grasslands and savannas	0.370	0.002		0.364	0.003		-0.264	0.132
Mediterranean forests, woodlands and scrub	0.105	0.423		0.140	0.287		-0.840	0.000
Montane grasslands and shrublands	-0.093	0.355		-0.079	0.427		-0.436	0.000
Temperate broadleaf and mixed forests	-0.962	0.000		-0.968	0.000		-0.623	0.000
Temperate conifer forests	-0.855	0.000		-0.877	0.000		-0.663	0.000
Temperate grasslands, savannas and shrublands	-0.503	0.000		-0.498	0.000		-0.268	0.000
Tropical and subtropical grasslands savannas and shrublands	0.200	0.000		0.199	0.000		0.741	0.000
Tropical and subtropical coniferous forests	-0.319	0.000		-0.322	0.000		-0.505	0.000
Tropical and subtropical dry broadleaf forests	0.019	0.756		0.025	0.685		-0.127	0.136
Tropical and subtropical moist broadleaf forests	0.317	0.000		0.316	0.000		0.092	0.018
R 2	0.73			0.73			0.46

b : estimated beta regression coefficients; p : probability level; R ² : coefficient of determination of the whole model adjusted by degrees of freedom.