Table 1.

Model estimates (with standard errors) and likelihood ratio tests for the significance of source environment, rearing temperature and their interaction on worker ant thermal tolerances, including CT_max, CT_min and tolerance breadth. Significant p-values at the 0.05 level are indicated in italics.

response	city	term	estimate	s.e.	χ2	p
CTmax	Cleveland	rearing temperature	0.0847	0.0195	55.3	1.03 × 10−13
		source environment	−0.562	0.688	9.59	0.00195
		temperature × source	0.0319	0.0272	1.38	0.241
	Cincinnati	rearing temperature	0.0943	0.0255	22.1	2.59 × 10−6
		source environment	0.292	0.942	0.279	0.597
		temperature × source	−0.014	0.0376	0.139	0.709
	Knoxville	rearing temperature	0.0747	0.0273	32.3	1.31 × 10−8
		source environment	−2	0.996	0.0389	0.844
		temperature × source	0.079	0.0396	3.99	0.0456
CTmin	Cleveland	rearing temperature	0.371	0.0556	77.5	1.32 × 10−18
		source environment	2.55	2	38.4	5.78 × 10−10
		temperature × source	−0.0456	0.0795	0.331	0.565
	Cincinnati	rearing temperature	0.00606	0.0533	2.33	0.127
		source environment	−3.91	1.96	22.5	2.14 × 10−6
		temperature × source	0.115	0.0782	2.17	0.141
	Knoxville	rearing temperature	0.467	0.0516	191	1.92 × 10−43
		source environment	−1.38	1.9	50.9	9.76 × 10−13
		temperature × source	0.117	0.0758	2.38	0.123
tolerance breadth	Cleveland	rearing temperature	−0.303	0.0649	31.7	1.81 × 10−8
		source environment	−3.54	2.29	22.5	2.15 × 10−6
		temperature × source	0.0923	0.0909	1.03	0.31
	Cincinnati	rearing temperature	0.0855	0.0636	0.348	0.555
		source environment	4.1	2.34	13.9	0.000191
		temperature × source	−0.125	0.0934	1.8	0.18
	Knoxville	rearing temperature	−0.395	0.0598	87.1	1.03 × 10−20
		source environment	−0.796	2.21	38.8	4.74 × 10−10
		temperature × source	−0.0306	0.0879	0.121	0.728