Table 1. Likelihood ratio tests on mixed model logistic regression on plastic traits.

Model	Effect tested	AIC	X2	p
a) Hatching time
t+s+d+sxd		15213
s+d+sxd	t	15750	539.2	<0.001
t*p+s+d+sxd	t x p	15214	2.8	0.24
t+t|s+d+sxd	t x s	15203	14.1	<0.001
t+s+t|d+sxd	t x d	15182	35.3	<0.001
t+s+d+t|sxd	t x s x d	15188	29.0	<0.001
b) Hatchling length
t+s+d+sxd		−3154.1
s+d+sxd	t	−2962.8	193.3	<0.001
t*p+s+d+sxd	t x p	−3150.2	0.2	0.90
t+t|s+d+sxd	t x s	−3150.1	0.1	0.96
t+s+t|d +sxd	t x d	−3168.5	18.4	<0.001
t+s+d+t|sxd	t x s x d	−3150.1	0	1
c) Yolk sac volume
t+s+d+sxd		9669.2
s+d+sxd	t	9677.7	10.5	0.001
t*p+s+d+sxd	t x p	9669.3	3.9	0.14
t+t|s+d+sxd	t x s	9672.2	1.0	0.62
t+s+t|d+sxd	t x d	9672.7	0.5	0.78
t+s+d+t|sxd	t x s x d	9673.2	0	1

Reference models are indicated in bold. To test the effect of treatment, the reference model was compared to a model lacking treatment. For the other effects, the reference model was compared to a model incorporating the effect of interest. t: treatment; p: population cross type (within vs. between); s: sire; d: dam