Table 2. Factors affecting sibling cannibalism and brood reduction.

	Sibling cannibalism								Brood reduction
Results from generalized linear model (binomial distribution and logic link function) and general lineal model exploring effects of experimental food supply, hatching date (1: 1 April), and hatching span (independent factors) on prevalence and intensity of sibling cannibalism and brood reduction, respectively. Statistically significant (P<0.05) differences are shown in bold.
	Prevalence				Intensity				Prevalence				Intensity
	Estimate (SE)	χ 2 1	P		Beta (SE)	F 1,44	P		Estimate (SE)	χ 2 1	P		Beta (SE)	F 1,44	P
Hatching date	0.017 (0.014)	1.46	0.226		0.212 (0.133)	2.53	0.119		-0.009 (0.025)	0.12	0.726		0.386 (0.109)	12.43	0.001
Hatching span	0.695 (0.299)	7.03	0.008		0.393 (0.134)	8.54	0.005		2.628 (0.820)	37.51	<0.001		0.530 (0.111)	22.98	<0.001
Exp. treatment	0.889 (0.369)	6.65	0.010		0.220 (0.133)	2.73	0.105		0.683 (0.676)	1.31	0.287		0.132 (0.109)	1.45	0.234