Table 4
Main features of the studied rivers: HER (hydroecoregion), main geological composition of the catchment, its size, mean percentage of urban land-use in the area surrounding the sampling sites, altitude of the downstream and upstream sites, number of authorized diversions counted in the surrounding 500 m within the downstream and upstream sites. Mean and standard deviations of the main chemical–physical parameters detected in the 5 studied rivers. DO = dissolved oxygen; TSS = total suspended solids; SRP = soluble reactive phosphorous; N–NO3 = nitrates.
| River | HER | Geology | Catchment size (km2) | Urban land use (%) | Altitude of the down- and upstream sites (m asl) | Number of authorized diversions | Month | Conductivity (µS cm−1) | DO (%) | DO (mg L−1) | pH | Temperature (°C) | TSS (mg L−1) | SRP (mg L−1) | N–NO3 (mg L−1) |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Argentina | 122 | Flysch | 211 | 5.20 | 1–46 | >150 | April | 321 ± 60.8 | 95.8 ± 4.67 | 9.51 ± 0.61 | 8.90 ± 0.33 | 15.59 ± 0.49 | 1.85 ± 2.05 | 0.015 ± 0.00 | 0.970 ± 1.13 |
| June | 274 ± 14.1 | 117.4 ± 1.91 | 10.20 ± 0.28 | 9.13 ± 0.08 | 23.10 ± 2.40 | 2.31 ± 0.30 | 0.023 ± 0.02 | 0.314 ± 0.08 | |||||||
| July | 262 ± 7.8 | – | – | 7.34 ± 0.88 | – | 2.05 ± 2.40 | – | – | |||||||
| August | 243 ± 47.4 | 110.4 ± 17.11 | 9.26 ± 0.83 | 8.31 ± 0.17 | 24.15 ± 3.33 | 0.99 ± 0.30 | 0 | 0.169 | |||||||
| September | 263 ± 27.6 | 110.8 ± 11.53 | 10.54 ± 0.90 | 8.80 ± 0.05 | 17.87 ± 0.51 | 0.66 ± 0.24 | 0.011 ± 0.02 | 0.122 ± 0.047 | |||||||
| Impero | 122 | Flysch | 96 | 6.47 | 2–38 | >50 | April | 482 ± 62.9 | 105.1 ± 5.49 | 11.30 ± 0.44 | 8.92 ± 0.11 | 12.13 ± 2.73 | 1.53 ± 0.48 | 0.014 ± 0.01 | 0.773 ± 0.301 |
| June | 596 ± 28.3 | 103.8 ± 0.57 | 9.17 ± 0.08 | 8.63 ± 0.23 | 21.09 ± 0.64 | 11.27 ± 14.01 | 0.029 ± 0.01 | 0.337 ± 0.163 | |||||||
| July | 575 ± 30.4 | – | – | 7.60 ± 0.11 | – | 3.79 ± 3.44 | – | – | |||||||
| August | 599 ± 5.7 | 88.95 ± 19.02 | 7.69 ± 1.47 | 7.45 ± 0.15 | 22.43 ± 0.88 | 2.64 ± 1.27 | 0.000 ± 0.00 | 0.274 ± 0.047 | |||||||
| September | 645 ± 26.2 | 85.45 ± 20.72 | 7.79 ± 1.75 | 8.39 ± 0.16 | 19.59 ± 1.20 | 3.12 ± 3.38 | 0.011 ± 0.00 | 0.243 ± 0.077 | |||||||
| October | 630 | 91 | 8.79 | 7.95 | 17.11 | 3.36 | – | – | |||||||
| Merula | 122 | Flysch | 49 | 11.40 | 6–46 | 19 | April | 470 ± 48.1 | 101.55 ± 5.87 | 9.74 ± 0.09 | 8.70 ± 0.02 | 17.44 ± 2.38 | 0 | 0.032 ± 0.00 | 0.835 ± 0.403 |
| June | 429 ± 2.8 | 103.40 ± 1.98 | 9.62 ± 0.27 | 8.82 ± 0.02 | 18.9 ± 0.57 | 2.66 ± 0.18 | 0.003 ± 0.00 | 0.51 | |||||||
| July | 419 ± 2.8 | – | – | 7.85 ± 0.35 | – | 0.39 ± 0.37 | – | – | |||||||
| August | 418 ± 12.7 | 111.05 ± 19.30 | 9.56 ± 1.42 | 7.88 ± 0.06 | 22.9 ± 1.21 | 1.54 ± 1.35 | 0.000 ± 0.00 | 0.501 ± 0.190 | |||||||
| September | 527 ± 140.0 | 94.45 ± 9.12 | 8.50 ± 1.41 | 7.96 ± 0.54 | 20.33 ± 2.76 | 1.85 ± 0.90 | 0.002 | 0.141 | |||||||
| October | 507 ± 77.8 | 72.85 ± 25.95 | 7.145 ± 2.79 | 8.25 ± 0.33 | 16.89 ± 2.61 | 0.40 ± 0.44 | 0.001 ± 0.00 | 0.673 ± 0.477 | |||||||
| Quiliano | 122 | Schist | 52 | 51.87 | 30–35 | 39 | April | 146 ± 26.9 | 95.85 ± 5.59 | 10.55 ± 0.74 | 8.48 ± 0.06 | 11.14 ± 0.62 | 0 | 0.007 ± 0.01 | 0.952 ± 0.036 |
| June | 158 ± 0.0 | 104.85 ± 3.18 | 9.45 ± 0.68 | 8.99 ± 0.07 | 22.29 ± 2.67 | 0.50 ± 0.14 | 0.013 ± 0.01 | 0.630 ± 0.010 | |||||||
| July | 159 ± 2.1 | – | – | 8.76 ± 0.12 | – | 0.65 ± 0.68 | – | – | |||||||
| August | 173 ± 1.4 | 95.00 ± 0.28 | 8.66 ± 0.10 | 8.34 ± 0.72 | 19.89 ± 0.33 | 6.48 ± 4.55 | 0.0001 ± 0.00 | 0.524 ± 0.057 | |||||||
| September | 185 ± 0.7 | 94.55 ± 1.06 | 9.24 ± 0.30 | 8.31 ± 0.12 | 16.51 ± 1.05 | 2.13 ± 2.46 | 0.002 ± 0.00 | 0.350 ± 0.084 | |||||||
| October | 196 | 112.1 | 10.43 | 8.59 | 18.52 | 0 | – | – | |||||||
| Vallecrosia | 122 | Flysch | 22 | 5.91 | 6–82 | 9 | April | 504 ± 6.4 | 114.35 ± 21.57 | 10.52 ± 0.98 | 9.01 ± 0.28 | 19.16 ± 4.79 | 4.07 ± 3.77 | 0.021 ± 0.01 | 1.157 ± 0.343 |
| June | 501 ± 22.6 | 115.95 ± 24.11 | 10.16 ± 1.90 | 8.67 ± 0.12 | 21.62 ± 0.97 | 1.74 ± 0.21 | 0.010 ± 0.01 | 0.823 ± 0.12 | |||||||
| July | 487 | – | – | 8.69 | – | 1.66 ± 1.61 | – | – | |||||||
| August | 523 ± 61.2 | 134.60 ± 36.63 | 11.96 ± 3.59 | 7.83 ± 0.36 | 21.30 ± 1.55 | 8.44 ± 4.70 | 0.000 ± 0.00 | 0.410 ± 0.010 | |||||||
| September | 566 ± 65.8 | 99.45 ± 9.83 | 9.46 ± 0.93 | 7.72 ± 0.68 | 17.66 ± 0.11 | 4.64 ± 1.94 | 0.021 ± 0.03 | 0.471 ± 0.047 | |||||||
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