Table 1.

Effects of female traits and climatic variables on the number of hatchlings

Sources of variation	Estimate	SE	z	P
(N = 8895 broods of 6457 females)
Intercept	5.54	0.03	204.93	< 0.001
Female age: young	− 0.04	0.02	− 2.06	0.040
Female body condition	− 0.03	0.01	− 3.08	0.002
Within-year temperature: incubation	0.00	0.01	0.39	0.70
Between-year temperature: incubation	0.04	0.02	1.72	0.085
Within-year precipitation: incubation	0.01	0.01	0.91	0.36
Between-year precipitation: incubation	− 0.01	0.02	− 0.32	0.75
Laying date	− 0.03	0.02	− 1.76	0.079
Clutch size	0.40	0.01	31.23	< 0.001
Female ID random	1.25
Plot ID random	0.03
Year of study random	0.11
R2 marginal/conditional	0.09/0.89

Output of generalized linear mixed model with Gaussian error distribution and the identity-link function testing how female age (as a categorical predictor), female body condition, the within- and between-year effects of ambient temperature and sum of precipitation experienced during the incubation period, laying date, and clutch size (all as continuous predictors), affect the number of hatchlings. All continuous explanatory terms were standardized. The female identity, study plot identity, and year of study were included as random factors. Significant terms P < 0.05 are in bold