Egg investment strategies adopted by a desertic passerine, the Saxaul Sparrow (Passer ammodendri)

Bao, Xinkang; Zhao, Wei; Liu, Fangqing; Li, Jianliang; Ma, Donghui

doi:10.1186/s40657-020-00201-0

Avian Research

Table 2 Analysis of deviance table (type II Wald Chi-square tests) for the best-fit models to explain the effect of different factors (fixed effects of model) on clutch size, egg size, hatchability and fledging rate. Female identity and year were considered as random effects in all models

From: Egg investment strategies adopted by a desertic passerine, the Saxaul Sparrow (Passer ammodendri)

Response	First brood				Second brood
Response	Estimate	t value	P		Estimate	t value	P
Clutch size
Laying date	0.02 ± 0.01	3.498	0.00***	Laying date	− 0.03 ± 0.01	− 3.802	0.00***
Egg size	− 0.26 ± 0.21	− 1.264	0.21	Egg size	− 0.12 ± 0.33	− 0.359	0.72
Ambient humidity	0.02 ± 0.01	2.026	0.04*	Ambient humidity	0.01 ± 0.01	1.083	0.28
%D of the final egg	− 0.02 ± 0.01	− 1.870	0.06	Female’s body size	0.03 ± 0.09	0.315	0.75
Female’s body size	0.06 ± 0.06	1.000	0.32	Male’s body size	0.62 ± 0.10	6.240	0.00***
Male’s body size	0.43 ± 0.06	7.696	0.00***
Egg size
Laying date	0.00 ± 0.00	0.874	0.38	Laying date	0.00 ± 0.00	0.459	0.65
Clutch size	− 0.03 ± 0.02	− 1.636	0.10	Clutch size	− 0.00 ± 0.02	− 0.072	0.94
%D of the final egg	− 0.00 ± 0.00	− 1.558	0.12	Ambient humidity	− 0.00 ± 0.00	− 1.738	0.08
Female’s body size	0.05 ± 0.02	2.795	0.01**	Female’s body size	0.04 ± 0.02	2.184	0.03*
Male’s body size	0.02 ± 0.02	0.930	0.35	Male’s body size	0.05 ± 0.02	2.465	0.01*
Hatchability
Laying date	0.00 ± 0.00	2.087	0.04*	Laying date	− 0.00 ± 0.00	− 0.748	0.45
Clutch size	− 0.06 ± 0.02	− 3.397	0.00***	Clutch size	− 0.05 ± 0.02	− 2.945	0.00**
Egg size	0.05 ± 0.06	0.759	0.45	Egg size	0.05 ± 0.07	0.644	0.52
Ambient humidity	0.00 ± 0.00	0.601	0.55	%D of the final egg	− 0.00 ± 0.00	− 0.198	0.84
Female’s body size	0.03 ± 0.02	1.398	0.16	Fmale’s body size	0.00 ± 0.02	0.030	0.98
Male’s body size	0.07 ± 0.02	3.635	0.00***	Male’s body size	0.05 ± 0.02	2.154	0.03*
Fledging rate
Laying date	0.01 ± 0.00	2.340	0.02*	Laying date	− 0.00 ± 0.00	− 0.747	0.46
Hatchability	− 0.17 ± 0.09	− 1.894	0.06	Hatchability	− 0.14 ± 0.07	− 1.838	0.07
Clutch size	0.01 ± 0.02	0.682	0.50	Clutch size	− 0.01 ± 0.02	− 0.626	0.53
Egg size	0.15 ± 0.08	1.943	0.05	Egg size	0.10 ± 0.06	1.601	0.11
Female’s body size	− 0.01 ± 0.01	− 0.718	0.47	Female’s body size	− 0.00 ± 0.02	− 0.061	0.95
Male’s body size	0.01 ± 0.01	1.832	0.07	Male’s body size	0.02 ± 0.02	0.921	0.36

Italic values indicate statistically significant associations
***p <0.001, **p <0.01, * p<0.05

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