Table 1.

Results of general linear mixed model showing factors affecting nestling residual body mass and body mass in tree swallows (Tachycineta bicolor) following experimental heating of nest boxes during the incubation period. (Nestlings were cross-fostered on day 3 of the nestling period. Origin refers to treatment (heated versus control) nestlings experienced as eggs; final refers to treatment that feeding females experienced during the nestling period. Effect size is given as partial η². Numbers in bold indicate p<0.05; numbers in italics indicate p<0.10.)

predictors	day 4		day 7		day 10		day 13
	residual body mass	mass	residual body mass	mass	residual body mass	mass	residual body mass	mass
heating treatment at nest of origin	F=5.12	F=5.23	F=6.01	F=5.23	F=1.06	F=0.74	F=0.41	F=0.00
	p=0.028	p=0.0028	p=0.018	p=0.027	p=0.31	p=0.39	p=0.52	p=0.96
	${\eta }_{\text{p}}^2$=0.33	${\eta }_{\text{p}}^2$=0.53	${\eta }_{\text{p}}^2$=0.29	${\eta }_{\text{p}}^2$=0.25
heating treatment of nest of rearing	F=0.55	F=0.62	F=3.01	F=2.77	F=4.88	F=4.77	F=10.32	F=5.16
	p=0.046	p=0.43	p=0.09	p=0.10	p=0.03	p=0.04	p=0.002	p=0.03
					${\eta }_{\text{p}}^2$=0.20	${\eta }_{\text{p}}^2$=0.17	${\eta }_{\text{p}}^2$=0.37	${\eta }_{\text{p}}^2$=0.25
clutch size	F=0.81	F=1.13	F=1.11	F=0.60	F=1.48	F=0.85	F=0.58	F=0.43
	p=0.38	p=0.29	p=0.30	p=0.44	p=0.23	p=0.36	p=0.45	p=0.52
female age at origin	F=0.01	F=0.39	F=2.33	F=0.50	F=2.61	F=1.99	F=2.09	F=2.71
	p=0.90	p=0.53	p=0.13	p=0.48	p=0.13	p=0.17	p=0.15	p=0.11
female age at final box	F=0.31	F=0.15	F=2.01	F=1.31	F=0.67	F=0.00	F=0.28	F=0.98
	p=0.58	p=0.70	p=0.16	p=0.26	p=0.41	p=0.99	p=0.60	p=0.33
average ambient temperature during incubation	F=0.08	F=0.23	F=4.31	F=2.07	F=1.59	F=1.03	F=1.43	F=2.00
	p=0.77	p=0.63	p=0.04	p=0.16	p=0.21	p=0.32	p=0.24	p=0.16
			${\eta }_{\text{p}}^2$=0.11
insect availability during incubation	F=2.88	F=1.40	F=1.88	F=1.32	F=6.48	F=12.03	F=0.55	F=0.00
	p=0.09	p=0.24	p=0.18	p=0.26	p=0.01	p=0.001	p=0.47	p=0.96
					${\eta }_{\text{p}}^2$=0.17	${\eta }_{\text{p}}^2$=0.18
clutch initiation date	F=5.59	F=0.42	F=1.47	F=0.19	F=0.18	F=0.17	F=0.63	F=0.28
	p=0.02	p=0.02	p=0.23	p=0.67	p=0.68	p=0.68	p=0.43	p=0.60
	${\eta }_{\text{p}}^2$=0.09	${\eta }_{\text{p}}^2$=0.05
nestling measure in previous time period			F=0.77	F=1.11	F=2.01	F=1.73	F=1.81	F=1.93
			p=0.39	p=0.30	p=0.16	p=0.20	p=0.19	p=0.17
d.f.	1,50	1,50	1,49	1,49	1,49	1,49	1,44	1,44