Table 1 Relationships between resident bird species richness, phylogenetic structure (Phylo NRI), functional structure (Funct NRI) and each associated variable by ordinary least squares (OLS) and simultaneous autoregressive (SAR) models

From: Precipitation is the dominant driver for bird species richness, phylogenetic and functional structure in university campuses in northern China

	Species richness				Phylo NRI				Funct NRI
	Coef__ols	r²__ols	Coef__sar	r²__sar	Coef__ols	r²__ols	Coef__sar	r²__sar	Coef__ols	r²__ols	Coef__sar	r²__sar
MAT	0.52	0.27*	0.52	0.31**	− 0.22	0.05	− 0.17	0.13	− 0.18	0.03	− 0.15	0.04
MAP	0.45	0.20*	0.44	0.22*	− 0.23	0.05	− 0.66	0.38**	− 0.54	0.29*	− 0.55	0.41**
Velo_MAT	0.05	0	0.06	0.04	0.28	0.08	0.14	0.12	0	0	− 0.04	0.02
Velo_MAP	− 0.31	0.10	− 0.31	0.13	0.30	0.09	0.24	0.15	0.22	0.05	0.20	0.06
Plant_SR	0.52	0.27*	0.49	0.27**	0.16	0.03	0.06	0.10	− 0.10	0.01	− 0.20	0.05
Area	0.02	0	0.04	0.04	0.18	0.03	0.14	0.12	0.29	0.08	0.30	0.11
Age	− 0.16	0.02	− 0.14	0.06	− 0.25	0.06	− 0.19	0.14	− 0.19	0.04	− 0.22	0.06
Population	0.09	0.01	− 0.04	0.04	− 0.06	0	− 0.01	0.10	− 0.13	0.02	− 0.26	0.08

MAT and MAP are mean annual temperature and precipitation. Velo_MAT and Velo_MAP are glacial-interglacial velocity in MAT and MAP. Plant_SR is plant species richness. Area, Age and Population are campus area, age and population density. Coefficients (Coef) and r² were given. And r² of significant variables were in italics. *p < 0.05; **p < 0.01

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