Table 4.
Results of the SIMPER analysis based on mayfly assemblages from sites of different hydromorphological (HYMO) alternation levels.
| Species | Average abundance per site (ind/m2) | Similarity contribution within group (%) |
|---|---|---|
| Group 1 good and high EQR based on RFI (EQR > 0.6) | ||
| Average similarity: 18.68 | ||
| Baetis sp. juv. | 2.54 | 33.12 |
| Cloeon dipterum | 1.38 | 16.42 |
| Serratella ignita | 2.07 | 12.01 |
| Baetis fuscatus | 1.73 | 10.82 |
| Caenis luctuosa | 1.63 | 10.32 |
| Baetis vernus | 1.33 | 6.58 |
| Baetis buceratus | 1.16 | 3.59 |
| Group 2 moderate EQR based on RFI (0.4 < EQR < 0.6) | ||
| Average similarity: 31.33 | ||
| Baetis sp. juv. | 4.00 | 58.12 |
| Baetis vernus | 2.09 | 21.63 |
| Cloeon dipterum | 1.23 | 12.51 |
| Group 3 poor and bad EQR based on RFI (EQR < 0.4) | ||
| Average similarity: 31.54 | ||
| Baetis sp. juv. | 3.51 | 39.10 |
| Cloeon dipterum | 2.63 | 28.10 |
| Baetis buceratus | 2.21 | 16.08 |
| Baetis fuscatus | 1.45 | 5.57 |
| Caenis sp. juv. | 1.14 | 3.27 |