Table 1.
The basic characteristics of the studied lakes.
| LAKE | Przystań | Mamry | Dargin | Kisajno | Niegocin | |
|---|---|---|---|---|---|---|
| Area [ha] | 115 | 2 504 | 3 030 | 1 896 | 2 600 | |
| Max depth [m] | 22.8 | 43.8 | 37.6 | 25 | 39.7 | |
| Coordinates of sampling location | 54.207241, 21.657892 | 54.157234, 21.723144 | 54.145939, 21.731939 | 54.042000, 21.738594 | 54.009215, 21.738598 | |
| Mean TSI | 42 ± 2 | 40 ± 9 | 43 ± 1 | 53 ± 3 | 49 ± 3 | |
| Trophic state | ME | ME | ME | ME | ME | |
| Temp [°C] | 21.35 ± 0.06 | 21.68 ± 0.141 | 22.50 ± 0.02 | 21.64 ± 1.56 | 22.38 ± 0.74 | |
| Cond [μScm2] | 297.00 ± 0.0 | 295.00 ± 0.0 | 302.00 ± 0.0 | 324.00 ± 6.0 | 370.00 ± 1.4 | |
| Oxygen [mgL−1] | 9.77 ± 0.03 | 10.05 ± 0.03 | 10.19 ± 0.0 | 10.27 ± 1.08 | 10.47 ± 0.26 | |
| pH | 8.38 ± 0.01 | 8.32 ± 0.05 | 8.50 ± 0.0 | 8.40 ± 0.09 | 8.45 ± 0.0 | |
| Turbidity [NTU] | 0.03 ± 0.06 | 4.35 ± 5.3 | 0.30 ± 0.14 | 0.87 ± 0.50 | 1.20 ± 0.14 | |
| Chl a [µgL−1] | 3.77 ± 0.40 | 0.94 ± 1.13 | 3.37 ± 0.57 | 12.26 ± 1.69 | 5.29 ± 0.28 | |
| TP[µgL−1] | 15.05 ± 0.53 | 15.67 ± 1.34 | 15.67 ± 0.53 | 30.16 ± 1.54 | 26.97 ± 0.64 | |
| P-PO43− [µgL−1] | 3.68 ± 0.35 | 3.13 ± 0.21 | 3.48 ± 0.62 | 3.58 ± 0.30 | 14.26 ± 0.92 | |
| TN [µgL−1] | 367 ± 58 | 633 ± 115 | 533 ± 152 | 650 ± 71 | 600 ± 0 | |
| DOC [mgL−1] | 8.43 ± 0.07 | 8.09 ± 0.07 | 9.11 ± 0.08 | 9.23 ± 0.1 | 11.26 ± 0.03 | |
| HNF [cellmL−1] | 3.92 ± 0.77 × 103 | 2.10 ± 0.76 × 104 | 1.47 ± 0.2 × 104 | 2.69 ± 0.44 × 104 | 2.13 ± 032 × 104 | |
| Bacteria Number [cellml−1] | 3.9 ± 0.39 × 106 | 5.2 ± 0.21 × 106 | 4.2 ± 0.41 × 106 | 4.9 ± 0.31 × 106 | 4.9 ± 0.24 × 106 | |
| LAKE | Boczne | Jagodne | Szymoneckie | Szymon | Tałtowisko | |
| Area [ha] | 183 | 420 | 523 | 154 | 327 | |
| Max depth [m] | 25 | 37.4 | 28.5 | 2.9 | 39.5 | |
| Coordinates of sampling location | 53.967407, 21.758265 | 53.945283, 21.721688 | 53.918687, 21.697991 | 53.891046, 21.633682 | 53.880376, 21.560412 | |
| Mean TSI | 50 ± 4 | 58 ± 3 | 59 ± 2 | 58 ± 1 | 56 ± 3 | |
| Trophic state | ME | E | E | E | E | |
| Temp [°C] | 20.95 ± 0.01 | 22.03 ± 0.03 | 21.65 ± 0.01 | 20.87 ± 0.01 | 21.48 ± 0.91 | |
| Cond [μScm2] | 373.00 ± 0.0 | 354.00 ± 0.0 | 354.00 ± 0.0 | 354.50 ± 0.71 | 361.00 ± 5.2 | |
| Oxygen [mgL−1] | 10.05 ± 0.01 | 10.08 ± 0.08 | 9.55 ± 0.01 | 7.61 ± 0.03 | 9.82 ± 0.16 | |
| pH | 8.44 ± 0.06 | 8.44 ± 0.0 | 8.42 ± 0.01 | 8.02 ± 0.01 | 8.31 ± 0.04 | |
| Turbidity [NTU] | 1.57 ± 0.31 | 3.77 ± 0.11 | 3.60 ± 0.28 | 2.95 ± 0.35 | 1.90 ± 0.1 | |
| Chl a [µgL−1] | 7.93 ± 0.15 | 23.23 ± 1.56 | 24.07 ± 0.42 | 18.11 ± 0.64 | 19.05 ± 0.40 | |
| TP[µgL−1] | 31.80 ± 1.52 | 35.19 ± 0.18 | 40.13 ± 0.36 | 37.35 ± 1.25 | 30.67 ± 0.71 | |
| P-PO43− [µgL−1] | 6.17 ± 0.46 | 3.73 ± 0.21 | 3.43 ± 0.21 | 3.38 ± 0.46 | 2.78 ± 0.17 | |
| TN [µgL−1] | 433 ± 58 | 700 ± 100 | 700 ± 100 | 667 ± 153 | 867 ± 153 | |
| DOC [mgL−1] | 11.12 ± 0.29 | 11.99 ± 0.08 | 10.08 ± 0.05 | 10.28 ± 0.03 | 11.52 ± 0.11 | |
| HNF [cellmL−1] | 2.60 ± 0.70 × 104 | 2.54 ± 0.37 × 104 | 3.83 ± 0.5.4 × 104 | 1.15 ± 0.14 × 104 | 3.93 ± 0.53 × 104 | |
| Bacteria Number [cellml−1] | 5.0 ± 0.53 × 106 | 4.3 ± 0.24 × 106 | 4.2 ± 0.33 × 106 | 6.4 ± 0.21 × 106 | 3.8 ± 0.29 × 106 | |
| LAKE | Tałty | Ryńskie | Mikołajskie | Bełdany | Śniardwy | |
| Area [ha] | 1 160 | 671 | 498 | 941 | 11 340 | |
| Max depth [m] | 50.8 | 20.2 | 25.9 | 46 | 23.4 | |
| Coordinates of sampling location | 53.813409, 21.567998 | 53.935961, 21.544402 | 53.801142, 21.570925 | 53.686344, 21.578000 | 53.766621, 21.842127 | |
| Mean TSI | 59 ± 4 | 60 ± 1 | 59 ± 2 | 60 ± 1 | 42 ± 4 | |
| Trophic state | E | E | E | E | ME | |
| Temp [°C] | 22.66 ± 0.07 | 22.59 ± 0.11 | 21.72 ± 0.86 | 23.50 ± 0.11 | 23.58 ± 0.13 | |
| Cond [μScm2] | 306.33 ± 0.58 | 309.33 ± 0.58 | 310.33 ± 5.0 | 256.00 ± 0.0 | 291.36 ± 1.4 | |
| Oxygen [mgL−1] | 11.52 ± 0.50 | 9.90 ± 0.04 | 10.12 ± 0.94 | 12.65 ± 0.05 | 13.58 ± 0.4 | |
| pH | 8.54 ± 0.03 | 8.40 ± 0.0 | 8.40 ± 0.11 | 8.63 ± 0.01 | 8.46 ± 0.02 | |
| Turbidity [NTU] | 6.17 ± 0.38 | 4.23 ± 0.06 | 4.80 ± 3.0 | 7.03 ± 0.15 | 0.45 ± 0.11 | |
| Chl a [µgL−1] | 12.30 ± 5.54 | 20.99 ± 0.68 | 20.86 ± 3.00 | 23.74 ± 0.93 | 2.05 ± 1.58 | |
| TP[µgL−1] | 58.32 ± 0.64 | 43.42 ± 0.82 | 48.86 ± 0.36 | 45.57 ± 1.41 | 16.28 ± 0.31 | |
| P-PO43− [µgL−1] | 4.48 ± 0.0 | 3.38 ± 0.17 | 4.48 ± 0.30 | 3.58 ± 0.30 | 3.78 ± 0.17 | |
| TN [µgL−1] | 800 ± 58 | 633 ± 0 | 700 ± 100 | 1000 ± 100 | 700 ± 0 | |
| DOC [mgL−1] | 9.05 ± 0.07 | 9.5 ± 0.02 | 9.15 ± 0.11 | 7.55 ± 0.07 | 8.02 ± 0.05 | |
| HNF [cellmL−1] | 2.42 ± 0.75 × 104 | 3.96 ± 1.2 × 104 | 2.35 ± 0.36 × 104 | 4.28 ± 0.41 × 104 | 9.21 ± 2.8 × 103 | |
| Bacteria Number [cellml−1] | 5.5 ± 0.2 × 106 | 5.6 ± 0.12 × 106 | 5.6 ± 0.4 × 106 | 5.2 ± 0.35 × 106 | 4.9 ± 0.51 × 106 |
±Are the standard deviation of mean values. Temp: temperature; Cond: special conductivity; Oxygen: Dissolved oxygen concentration; Turbidity: nephelometric turbidity; Chl a: chlorophyll a concentration; TP: total phosphorus; P-PO43−: dissolved orthophosphates; TN: total nitrogen; DOC: dissolved organic carbon; HNF: number of heterotrophic nanoflagellates; Bacterial number: number of DAPI-stained bacteria; Trophic state E: Lake belongs to the group of eutrophic lakes; Trophic state ME: Lake belongs to the group of meso-eutrophic lakes; Mean TSI: Mean Trophic State Index calculated on the basis of the concentration of chlorophyll a, total phosphorus and the visibility of the Secchi disc.