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Table 1
Summary of environmental variables at the 20 study sites given as range of measured values.
| Variable (measurement unit) | Range of measured values |
|---|---|
| Sampling depth (cm) | 1–110 |
| Flow velocity (m/s) | 0.00–3.20 |
| Water temperature (°C) | 14.7–25.7 |
| Dissolved oxygen (mg/L) | 6.0–8.9 |
| Oxygen saturation (%) | 69.9–106.0 |
| Conductivity (µS/cm) | 419–620 |
| pH | 7.90–8.48 |
| Biological oxygen demand (BOD, mg O₂/L) | 1.9–7.7 |
| Ammonium concentration (NH₄⁺, mg N/L) | <0.008–0.261 |
| Nitrites (NO₂⁻, mg N/L) | 0.005–0.078 |
| Nitrates (NO₃⁻, mg N/L) | 0.438–1.892 |
| Kjeldahl nitrogen (mg N/L) | 0.08–1.20 |
| Organic nitrogen (mg N/L) | 0.031–1.150 |
| Total nitrogen (Ʃ N, mg N/L) | 1.10–2.88 |
| Orthophosphates (PO₄3⁻, mg P/L) | 0.011–0.063 |
| Total phosphorous (Ʃ P, mg P/L) | 0.081–0.296 |
| Coarse substrate – macrolithal, mesolithal, microlithal (%) | Total 27.5% |
| Small-grained substrate – akal, psammal, argyllal (%) | Total 48% |
| Artificial substrate – technolithal (%) | Total 13.1% |
| Biotic substrate – macrophytes, xylal (%) | Total 11.5% |
| Study sites distance from source (km) | 0.4–104.2 |
| Altitude of study sites (m a.s.l) | 290–136 |
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