Table 2.

Multiple regressions of species richness against various combinations of environmental predictor variables (see Table 1).

model	model r2	explanatory variable	coefficient	z	p-value
GLM	0.63	temperature	3.800e−04	20.58	<2e−16
		AET	8.429e−04	290.73	<2e−16
		seasonality	−1.155e−03	−64.21	<2e−16
SARa	n.a.	temperature	3.7164e−03	8.5498	<2e−16
		AET	4.5875e−03	54.2796	<2e−16
		seasonality	4.1664e−05	0.0966	0.923
GLM	0.64	temperature	−8.868e−05	−4.078	4.54e−05
		AET	8.421e−04	290.042	<2e−16
		seasonality	−1.110e−03	−61.783	<2e−16
		climate change	−1.004e−02	−40.333	<2e−16
SARa	n.a.	temperature	2.1932e−03	4.1638	3.129e−05
		AET	4.5640e−03	54.1079	<2.2e−16
		seasonality	−1.4365e−05	−0.0334	0.9734
		climate change	−2.8724e−02	−5.0825	3.725e−07

^aBecause of computational limitations, SAR models were generated using 25% of the database sampling one in every four cells using an evenly spaced lattice.