Distribution of Fishes in the Red River of the North Basin on Multivariate Environmental Gradients

Canonical Correspondence Analysis

Table 8. Correlation coefficients of environmental variables with canonical correspondence axes 1-4 (CC1-CC4). Cumulative percentage variance of species-environment relationship is in parentheses.

Environmental variable	CC1 (25.3)	CC2 (49.1)	CC3 (63.8)	CC4 (71.5)
conductivity	-0.4667	0.7075	0.2156	-0.2239
hardness	-0.3278	0.7114	0.2449	0.0367
alkalinity	0.0172	0.5102	0.1271	-0.0144
sulfate	-0.4068	0.6516	0.4622	-0.0139
chloride	-0.1493	0.2542	0.0590	-0.1575
residue	-0.4837	0.6901	0.3015	-0.0891
nitrogen	-0.1752	0.4307	-0.4294	-0.0327
phosphorus	-0.1035	0.5067	-0.1280	0.0524
average discharge	-0.4387	-0.6718	-0.4467	0.3002
May high discharge	-0.4161	-0.5074	-0.5141	0.3293
May low discharge	-0.2983	-0.7713	-0.4812	0.0563
flow variability (CV)	-0.0447	0.9231	-0.0091	-0.1607