Incubation strategies of the Black-necked Crane (Grus nigricollis) in relation to ambient temperature and time of day

Table 2 Results of general linear mixed model examining factors that influence nest attendance, recess frequency, on-bout duration and egg turning frequency of male Black-necked Cranes between 06:30 and 20:30 h at Yanchiwan National Nature Reserve, Gansu, China

Fixed-effect variables	Nest attendance			Recess frequency			On-bout duration			Egg turning frequency
Fixed-effect variables	β ± SE	t	p	β ± SE	t	p	β ± SE	t	p	β ± SE	t	p
Year	0.30 ± 0.03	10.17	<0.001	0.34 ± 0.07	4.77	<0.001	0.48 ± 0.07	6.86	<0.001	0.53 ± 0.13	4.18	<0.001
Date	0.05 ± 0.01	10.72	<0.001	0.10 ± 0.02	4.02	<0.001	0.05 ± 0.01	4.01	<0.001	0.18 ± 0.04	4.26	<0.001
Day of incubation	−0.05 ± 0.01	−9.03	<0.001	−0.10 ± 0.03	−3.85	<0.001	−0.04 ± 0.01	−2.93	0.004	−0.17 ± 0.05	−3.81	<0.001
Time of day	0.05 ± 0.01	8.23	<0.001	0.11 ± 0.03	3.27	0.001	0.06 ± 0.01	4.03	<0.001	0.01 ± 0.054	0.20	0.844
Temperature²	−0.000 ± 0.000	−0.75	0.46	−0.002 ± 0.001	−2.34	0.020	−0.000 ± 0.000	1.18	0.239	−0.002 ± 0.001	−1.45	0.148
Temperature	−0.002 ± 0.003	0.48	0.64	−0.04 ± 0.02	2.54	0.011	−0.01 ± 0.008	−1.17	0.244	−0.07 ± 0.03	2.33	0.020
Female	−0.56 ± 0.04	−12.79	<0.001	−0.17 ± 0.08	1.96	0.051	−0.45 ± 0.06	−7.50	<0.001	−0.11 ± 0.10	−1.14	0.254
Female × time of day	−0.07 ± 0.01	−7.27	<0.001	−0.07 ± 0.02	−3.59	<0.001	−0.05 ± 0.01	−3.27	0.001	−0.04 ± 0.02	−1.66	0.098

ISSN: 2053-7166