Research Article
Variability in the Structure of Phytoplankton Assemblages in relation to Human Disturbance in Southern Coast of Tunisia
| | Using environmental variables | Using nutrient ratios | | Axis 1 | Axis 2 | Axis 1 | Axis 2 |
| Eigenvalues | 0.493 | 0.154 | 0.153 | 0.104 | Species-environment correlations | 0.994 | 0.943 | 0.975 | 0.935 | Cumulative percentage variance of species data | 29.7 | 38.9 | 38.8 | 45.2 | Cumulative percentage variance of species-environment relation | 36.2 | 47.5 | 85.8 | 100.0 | Sum of all eigenvalues | 1.662 | 1.623 | Sum of all canonical eigenvalues | 1.361 | 0.734 | Explained variance by CCA | 81.88% | 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 | | | PT | 0.145 | 0.210 | | | | −0.879 | −0.072 | | | Salinity | −0.386 | 0.143 | | | pH | −0.821 | 0.033 | | | SM | −0.497 | −0.411 | | | N : P | | | 0.7204 | 0.6059 | Si : N | | | 0.7606 | −0.3145 | Si : P | | | 0.8765 | 0.2950 |
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