Table 1.

Outcome of PGLS analyses

CT values and warming and tolerance ranges	Estimate ± SE	T	P
CTmax
Intercept	35.79 ± 1.37	26.13	<0.001
Median soil temperature	0.16 ± 0.07	2.25	0.033
Status (indigenous)	−2.93 ± 0.81	−3.62	0.001
	F(2,27) = 8.46, P = 0.001, R2 = 0.34, MLλ = 0.00
CTmin
Intercept	−4.10 ± 1.90	−2.15	0.040
Median soil temperature	0.18 ± 0.08	2.32	0.028
Status (indigenous)	0.54 ± 0.94	0.57	0.571
	F(2,27) = 2.76, P = 0.081, R2 = 0.11, MLλ = 0.44
Tolerance range
Intercept	39.57 ± 2.38	16.66	<0.001
Median soil temperature	−0.006 ± 0.096	−0.07	0.947
Status (indigenous)	−3.35 ± 1.14	−2.95	0.007
	F(2,27) = 4.39, P = 0.022, R2 = 0.19, MLλ = 0.49
Warming tolerance
Intercept	42.83 ± 2.30	18.62	<0.001
Maximum soil temperature	−1.08 ± 0.08	−13.98	<0.001
Status (indigenous)	−2.82 ± 0.79	−3.57	0.001
	F(2,27) = 101, P < 0.001, R2 = 0.87, MLλ = 0.00

Outcome of PGLS analyses showing change in thermal tolerance (°C) with median (or maximum for warming tolerance) daytime soil surface temperature (°C) and the difference among indigenous and alien species. MLλ is the maximum-likelihood estimate of Pagel’s λ (21), a measure of phylogenetic effect where 0 indicates no effect and 1 indicates a strong effect equivalent to that expected under a BM model of evolutionary change.