Table 1
General features and the mean values (with SD) of environmental variables of the reservoirs R1, R2 and R3. Codes of environmental variables used in CCAs and units are given in brackets.
| Feature | R1 | R2 | R3 |
|---|---|---|---|
| General features of the reservoirs | |||
| Creation date | 1971 | 1968 | 2000 |
| Altitude (m asl) | 149.4 | 158.6 | 171.0 |
| Area (ha) | 350 | 240 | 48 |
| Depth (m) | max. 2.5, mean 1.97 | max. 3.0, mean 1.5 | max. 2.5, mean 2.3 |
| Degree of shoreline indentation (K) | 0.02 | 0.03 | 0.08 |
| Capacity (mln m3) | 6.9 | 5.0 | 1.13 |
| Water supply | Wieprz-Krzna Canal | Wieprz-Krzna Canal | River Mogielnica |
| Original area | fen meadows | fen meadows | fens in a river valley with peat excavations |
| Dominating surrounding type | Wet meadows secondary turned into swamps, forests | Alder and mixed forests, croplands, pastures | Croplands and dried out meadows, mixed forests and fens |
| Purpose | Agricultural usage, fisheries management | Agricultural usage, fisheries management | Fisheries management, recreation |
| Environmental variables | |||
| Physical and chemical parameters of water | |||
| Temperature (Temp, °C) | 15.0 ± 9.0 | 20.8 ± 9.9 | 14.62 ± 8.5 |
| pH | 8.4 ± 0.33 | 8.0 ± 0.38 | 8.3 ± 0.38 |
| Oxygen reduction potential (ORP, mV) | −35.69 ± 27.9 | 73.21 ± 42 | 75.45 ± 44.22 |
| Dissolved oxygen (DO, ppm) |
7.31 ± 1.4 | 7.41 ± 1.8 | 7.66 ± 0.6 |
| Electrical conductivity (EC, μS/cm) |
367 ± 29 | 215 ± 59 | 298 ± 81 |
| Total dissolved solids (TDS, ppm) |
191.28 ± 5.6 | 105.93 ± 3.8 | 181.44 ± 9.7 |
| Salinity (Salin, PSU) | 0.18 ± 0.005 | 0.1 ± 0.004 | 0.16 ± 0.006 |
| Structural parameters of reservoirs | |||
| Water depth (Depth, m) | 0.8 ± 0.4 | 0.9 ± 0.67 | 0.73 ± 0.23 |
| Bottom type (Bottom) | 1.37 ± 0.48 | 1.27 ± 0.45 | 1.8 ± 0.95 |
| Elodeids (Elodeids) | 2.54 ± 0.5 | 3.57 ± 0.83 | 1.15 ± 1.75 |
| Helophytes (Heloph) | 2.20 ± 0.4 | 2.51 ± 0.5 | 1.88 ± 1.52 |
| Shade (Shade) | 0 | 1 ± 0.5 | 0.8 ± 0.33 |
| Landscape parameters in buffering zones of reservoirs (areas or distances) | |||
| Forests (Forests, m2) | 579 ± 27 | 4547 ± 532 | 1581 ± 52 |
| Wet meadows and fens (Meadows, m2) | 26609 ± 2363 | 3905 ± 632 | 7677 ± 571 |
| Water (Water, m2) | 19829 ± 5122 | 13928 ± 1822 | 5590 ± 799 |
| Tall emergent vegetation (TEV, m2) | 8356 ± 1876 | 872 ± 40 | 309 ± 9 |
| Distance to the nearest standing water body (SW_dista, m) | 3240 ± 40 | 1270 ± 50 | 52 ± 10 |
| Distance to the nearest running water (RW_dista, m) | 20 ± 10 | 994 ± 30 | 130 ± 22 |
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