Environmental filtering and spatial processes equally contributed to macroinvertebrate metacommunity dynamics in the highly urbanized river networks in Shenzhen, South China

Ecological Processes

Table 3 Results of forward selection procedure in the db-RDA analysis in both wet and dry seasons

	Variable	Adj R²	Pseudo-F	P		Variable	Adj R²	Pseudo-F	P
Wet season	Environmental				Dry season	Environmental
	TN	0.115	8.939	0.001		PI	0.119	9.218	0.001
	%Sand and silt	0.150	3.440	0.001		WD	0.136	2.208	0.010
	WD	0.172	2.569	0.001		DO	0.150	1.932	0.016
	pH	0.182	1.712	0.041		COD_Cr	0.160	1.708	0.035
	WT	0.191	1.674	0.039		TP	0.171	1.772	0.024
	Spatial					Spatial
	PCNM1	0.100	7.760	0.001		PCNM1	0.069	5.510	0.001
	PCNM2	0.137	3.561	0.001		PCNM5	0.105	3.453	0.001
	PCNM4	0.169	3.295	0.001		PCNM2	0.126	2.412	0.004
	PCNM5	0.198	3.073	0.001		PCNM8	0.147	2.409	0.005
						PCNM4	0.164	2.197	0.006
						PCNM28	0.179	1.958	0.013