Table 2. Fish Jaccard’s similarity index (JI) and river-way distances among sampled stations in the Yangtze River (Mantel test, R =  − 0.9003).

Stations	YPZ	MYB	CCS	YJJ	YYD	YJZ	YSZ	YYW	XYT
YPZ	0	780	1,045	1,085	1,855	1,955	2,140	2,305	2,255
MYB	0.3333	0	265	305	1,075	1,175	1,360	1,525	1,475
CCS	0.2667	0.4545	0	150	920	1,020	1,205	1,370	1,320
YJJ	0.2800	0.4687	0.3437	0	770	870	1,055	1,220	1,170
YYD	0	0.2187	0.2800	0.4242	0	100	285	450	400
YJZ	0.0370	0.2581	0.2800	0.4242	0.7391	0	185	350	300
YSZ	0.0952	0.2593	0.3333	0.4333	0.5217	0.5652	0	165	115
YYW	0.0909	0.2593	0.2500	0.3548	0.6500	0.6364	0.5500	0	210
XYT	0	0.1852	0.1579	0.2667	0.4762	0.4286	0.6667	0.5625	0