The influence of urban park characteristics on bird diversity in Nanjing, China

Table 2 Results of model selection relating bird species richness to predictor variables using corrected Akaike information criterion (AIC_c)

Model	K	AIC_c	ΔAIC_c	w_i	Adjusted R²
Area + Distance + HD + Isolation1	6	− 78.60	0	0.3720	0.8190
Area + Noise + Distance + HD + Isolation1	7	− 77.48	1.12	0.2125	0.8227
Area + SI + Distance + HD + Isolation1	7	− 75.87	2.73	0.0950	0.8148
Area + Distance + HD + Isolation2 + Isolation1	7	− 75.54	3.06	0.0805	0.8131
Area + Noise + SI + Distance + HD + Isolation1	8	− 74.54	4.06	0.0489	0.8185
Area + Noise + Distance + HD + Isolation2 + Isolation1	8	− 74.22	4.38	0.0416	0.8169
Area + Noise + Distance + HD	6	− 74.15	4.45	0.0402	0.7959
Area + Distance + HD	5	− 73.83	4.77	0.0343	0.7842
Area + SI + Distance + HD + Isolation2 + Isolation1	8	− 72.59	6.01	0.0184	0.8087
Area + Noise + SI + Distance + HD	7	− 71.46	7.14	0.0105	0.7914
Area + SI + Distance + HD	6	− 71.32	7.28	0.0098	0.7796
Area + Noise + Distance + HD + Isolation2	7	− 71.13	7.47	0.0089	0.7895
Area + Noise + SI + Distance + HD + Isolation2 + Isolation1	9	− 71.03	7.57	0.0084	0.8122
Area + Distance + HD + Isolation2	6	− 70.97	7.63	0.0082	0.7775

Models with ΔAIC_c < 10, number of estimable parameters (K), Akaike difference (ΔAIC_c), Akaike weight (w_i) and adjusted R² were listed. SI = Shape Index; HD = Habitat Diversity. All candidate models were listed in Additional file 1: Table S3. See Table 1 for the abbreviated variables

ISSN: 2053-7166