Table 6.

Summary of the canonical correspondence analysis (CCA) carried out on freshwater snail species and environmental data

Axes	1	2	3	4	Total inertia
Eigenvalues	0.454	0.278	0.255	0.153	3.943
Species-environment correlations	0.889	0.778	0.866	0.705
Cumulative percentage variance
Of species data	11.5	18.6	25.0	28.9
Of species-environment relation	32.9	62.2	70.2	81.1
Sum of all eigenvalues					3.943
Sum of all canonical eigenvalues					1.406
Summary of the Monte Carlo test
Test of the significance of first canonical axis: eigenvalues = 0.806
F-ratio = 19.436
p value = 0.0020
Test of the significance of all canonical axes: trace = 2.839
F-ratio = 7.959
p value = 0.0020