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Table 4
Summary of environmental parameters analyzed in the CCA and their influence on Odonata variability. Significant variables (p < 0.05) are presented in bold.
| Parameter | Explains % | Contribution % | pseudo-F | P |
|---|---|---|---|---|
| Oxygen saturation (%) | 14.8 | 22.4 | 6.8 | 0.002 |
| pH | 12.5 | 18.8 | 6.5 | 0.002 |
| NH₄⁺ (mg N/L) | 12.1 | 18.2 | 7.4 | 0.002 |
| Ʃ N (mg N/L) | 3.6 | 5.5 | 2.6 | 0.036 |
| Water temperature (°C) | 3.6 | 5.4 | 2.3 | 0.048 |
| Velocity (m/s) max | 3.3 | 5.0 | 2.2 | 0.072 |
| Distance from source (m) | 3.0 | 4.5 | 2.0 | 0.056 |
| Conductivity (µS/cm) | 2.8 | 4.3 | 2.0 | 0.096 |
| Ʃ P (mg P/L) | 3.2 | 4.9 | 2.5 | 0.052 |
| BOD (mg O₂/L) | 2.2 | 3.2 | 1.7 | 0.144 |
| Dissolved O2 (mg O2/L) | 1.3 | 1.9 | 1.0 | 0.354 |
| NO₂⁻ (mg N/L) | 0.8 | 1.3 | 0.7 | 0.622 |
| PO₄3⁻ (mg P/L) | 0.7 | 1.0 | 0.5 | 0.688 |
| ORGANIC N (mg N/L) | 0.3 | 0.5 | 0.2 | 0.918 |
| Kjeldahl N (mg N/L) | <0.1 | 0.1 | <0.1 | 1. |
| NO₃⁻ (mg N/L) | <0.1 | <0.1 | <0.1 | 1. |
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