Table 2 Logistic regression comparison of the 14 variables used in the Type A and Type B models for C. scutulatus.

Independent Variable	All Samples			Sonoran			Chihuahuan			Cent. MX Plat.
Independent Variable	Df	F-value	P-value	Df	F-value	P-value	Df	F-value	P-value	Df	F-value	P-value
BIO1	124	−4.988	<0.001	56	−3.691	<0.001	39	−2.622	0.008	19	1.852	0.064
BIO2	124	−1.583	0.114	56	−1.637	0.102	39	−0.435	0.663	19	0.637	0.524
BIO4	124	1.383	0.167	56	−1.748	0.081	39	1.264	0.206	19	−2.257	0.024
BIO8	124	−3.411	<0.001	56	−2.480	0.013	39	−0.285	0.775	19	0.416	0.677
BIO9	124	−0.780	0.435	56	−3.212	0.001	39	−2.766	0.006	19	1.912	0.056
BIO11	124	−5.045	<0.001	56	−3.696	<0.001	39	−3.272	0.001	19	2.107	0.035
BIO12	124	0.654	0.513	56	−2.226	0.026	39	1.395	0.163	19	1.782	0.075
BIO15	124	−0.515	0.607	56	3.276	0.001	39	−2.604	0.009	19	2.115	0.034
BIO17	124	−0.882	0.378	56	−3.132	0.002	39	3.368	<0.001	19	−1.282	0.200
BIO18	124	−1.296	0.195	56	−0.879	0.379	39	0.383	0.701	19	0.781	0.435
BIO19	124	1.167	0.243	56	−2.460	0.014	39	1.064	0.287	19	−2.190	0.029
Aspect	124	1.369	0.171	56	−0.995	0.320	39	2.444	0.015	19	−0.250	0.802
Elevation	124	0.575	0.565	56	3.308	<0.001	39	−1.039	0.299	19	−1.309	0.190
Slope	124	0.115	0.909	56	2.172	0.030	39	0.183	0.855	19	−0.60	0.549

We used a full model and then compared the three lineages for which Type A and Type B individuals were identified. Bolded P-values were significantly different between the two models in a comparison. BIO1–BIO9 correspond to measures related to temperature and BIO12-BIO19 correspond to measures related to precipitation.

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