Table 4.

We used a mixed effects model to compare RMR between 8‐day‐old collared and pied flycatcher nestlings on Öland between 2013 and 2015. We fit year, the treatment from a brood manipulation experiment (enlargement, reduction, control), species and mass and all interactions between treatment, species and mass as fixed effects, and nest of origin and foster nest as random effects. The contrast species was always collared flycatchers, where the estimates including species are always the difference in pied flycatcher nestlings. The contrast treatment was control, thus the estimates for enlargement and reduction treatments are in comparison with the control treatment. Bold values refer to effects that were significant before accounting for multiple testing

Fixed effects	Estimate	Std. Error	df	t value	p Value	Adjusted p value
(Intercept)	0.020	0.65	169.9	0.03	.976	.975
Enlargement	−0.963	1.23	135.3	−0.78	.436	.688
Reduction	−0.328	1.31	169.2	−0.25	.803	.976
Species (Pied Flycatchers)	0.232	1.11	163.4	0.21	.835	.976
Mass	0.138	0.05	170.6	2.85	.004	.073
Year (2014)	−0.232	0.15	105.1	−1.58	.118	.273
Year (2015)	−0.177	0.15	106.3	−1.20	.235	.414
Enlargement × Species (pied flycatchers)	−1.401	2.88	172.8	−0.49	.628	.856
Reduction × Species (pied flycatchers)	−7.923	3.54	173.4	−2.24	.027	.159
Enlargement × Mass	0.061	0.10	135.0	0.63	.530	.796
Reduction × Mass	0.007	0.10	171.8	0.07	.947	.976
Species (pied flycatchers)  × Mass	−0.027	0.09	164.5	−0.31	.760	.976
Enlargement × Species (pied flycatchers) × Mass	0.129	0.24	173.9	0.54	.588	.840
Reduction × Species (pied flycatchers) × Mass	0.669	0.28	172.2	2.42	.017	.157

Random effects	Variance
Foster nest	0.121
Nest of origin	0.063
Residual	0.173