Research Article

Variability in the Structure of Phytoplankton Assemblages in relation to Human Disturbance in Southern Coast of Tunisia

Table 5

CCA results.

Using environmental variablesUsing nutrient ratios
Axis 1Axis 2Axis 1Axis 2

Eigenvalues0.4930.1540.1530.104
Species-environment correlations0.9940.9430.9750.935
Cumulative percentage variance of species data29.738.938.845.2
Cumulative percentage variance of species-environment relation36.247.585.8100.0
Sum of all eigenvalues1.6621.623
Sum of all canonical eigenvalues1.3610.734
Explained variance by CCA81.88%45.22%
Intraset correlations of variables with axes
−0.135−0.450
 Si(OH)4−0.955−0.026
0.281−0.339
−0.613−0.445
0.832−0.060
 NT−0.588−0.384
 PT0.1450.210
−0.879−0.072
 Salinity−0.3860.143
 pH −0.8210.033
 SM −0.497−0.411
 N : P0.72040.6059
 Si : N0.7606−0.3145
 Si : P0.87650.2950