Table 2. Parameter estimates for best model sets for multiple regression analyses of body size (SVL) in four species of Australian snake.

Species	r2	Δi	wi	Intercept	ET	ET range	PC1	PC2	Interactions
Pseudechis	0.196	0	0.49	0.007	0.016	0.004-0.028		-0.092	ET*PC2, 0.0083
	0.153	0.85	0.32	0.001	0.014
Dendrelaphis	0.077	0.00	0.64	-0.003	0.006		0.048
	0.077	1.95	0.24	-0.003	0.006		0.048	0.007
Hemiaspis	0.054	0.00	0.46	0.002				-0.089
	0.058	1.38	0.23	0.002			-0.016	-0.090
	0.054	1.96	0.17	0.003	0.002		-0.029	-0.092
Tropidonophis	0.014	0.00	0.27	0.007			-0.042
	0.023	0.85	0.18	0.006	-0.004		-0.049
	0.006	0.85	0.18	0.005	-0.003
	0.000	1.53	0.13	0.006				0.008
	0.014	1.97	0.10	0.007			-0.042	0.008

Three independent variables were used: time since exposure to toads (ET) and two principal components (PC1 and PC2) incorporating data on latitude, annual mean temperature, and annual precipitation. Species are listed in order of decreasing susceptibility to toads. Parameter estimates significantly different from zero are shown in bold. w_i is the Akaike weight of each model, and Δ_i refers to the change in Akaike information criterion value from the best model.