Table 2.

(a) Regressions between breeding success, brood frequency, and brood size and minimum temperatures pre- and post-hatching in capercaillie and black grouse. (b) Partial regressions after controlling for the effects of the variables ‘Small rodents’ and ‘Fox’. Diff. β denotes interspecific difference. (Statistically significant (p < 0.05) and near-significant (p = 0.05–0.10) values are in bold and italic, respectively.)

		capercaillie			black grouse			diff. β
(a) regressions		β	r	p	β	r	p	t	p
breeding success	8 weeks pre-hatching	0.188	0.36	0.03	0.041	0.07	0.66	1.17	0.24
	4 weeks pre-incubating	0.097	0.25	0.12	0.040	0.11	0.50	0.66	0.51
	incubating	0.097	0.26	0.11	−0.010	−0.03	0.87	1.26	0.21
	4 weeks post-hatch	0.150	0.44	0.005	0.146	0.38	0.02	0.05	0.96
brood frequency	8 weeks pre-hatching	0.068	0.43	0.007	−0.012	−0.07	0.66	2.27	0.03
	4 weeks pre-incubating	0.049	0.42	0.008	−0.001	−0.01	0.95	2.07	0.04
	incubating	0.022	0.20	0.23	−0.008	−0.09	0.60	1.25	0.22
	4 weeks post-hatching	0.035	0.34	0.04	0.021	0.20	0.22	0.57	0.57
brood size	8 weeks pre-hatching	0.007	0.01	0.94	0.120	0.21	0.21	0.81	0.42
	4 weeks pre-incubating	−0.060	−0.13	0.43	0.079	0.22	0.19	1.46	0.15
	incubating	0.064	0.15	0.37	0.013	0.04	0.83	0.55	0.58
	4 weeks post-hatching	0.136	0.34	0.04	0.138	0.35	0.03	0.02	0.98
(b) partial regressions		βp	rp	p	βp	rp	p
breeding success	8 weeks pre-hatching	0.155	0.30	0.06	0.040	0.07	0.65
	4 weeks pre-incubating	0.090	0.24	0.14	0.018	0.05	0.73
	incubating	0.088	0.24	0.18	0.016	0.04	0.81
	4 weeks post-hatching	0.115	0.34	0.03	0.093	0.24	0.11
brood frequency	8 weeks pre-hatching	0.061	0.38	0.01	−0.016	−0.10	0.54
	4 weeks pre-incubating	0.048	0.42	0.008	−0.005	−0.05	0.77
	incubating	0.019	0.18	0.33	−0.010	−0.10	0.60
	4 weeks post-hatching	0.024	0.23	0.16	0.010	0.10	0.57
Brood size	8 weeks pre-hatching	−0.020	−0.03	0.87	0.14	0.25	0.13
	4 weeks pre-incubating	−0.076	−0.17	0.32	0.060	0.17	0.30
	incubating	0.064	0.15	0.43	0.064	0.18	0.35
	4 weeks post-hatching	0.117	0.29	0.09	0.108	0.28	0.10