Table 1
Physicochemical parameters and trophic indices for waters of the reservoirs (mean ± SD). Denotations: SDT – Secchi disk transparency, DO – dissolved oxygen, TDS – total dissolved solutions, Chl a – chlorophyll a,TP – total phosphorus, TN – total nitrogen. Values with the different superscripts are significantly different among reservoirs by non-parametric Kruskal–Wallis test (ANOVA, P ≤ 0.05).
| Reservoir | CH | KA | PN |
|---|---|---|---|
| Water parameters | |||
| Temperature (°C) | 19.9 ± 1.9 | 20.0 ± 2.7 | 18.2 ± 2.0 |
| SDT (m) | 0.71 ± 0.13ab | 0.56 ± 0.08a | 0.82 ± 0.10b |
| pH | 8.09 ± 0.01a | 7.65 ± 0.19b | 7.55 ± 0.17b |
| DO (mg L−1) | 8.15 ± 0.45 | 8.19 ± 0.72 | 9.22 ± 1.08 |
| DO (%) | 83.7 ± 0.4ab | 84.2 ± 1.1a | 76.1 ± 1.2b |
| TDS (mg L−1) | 595.8 ± 116.9a | 672.5 ± 78.9b | 588.0 ± 39.2ab |
| Total suspension (mg L−1) | 7.8 ± 5.6ab | 9.6 ± 5.8a | 4.0 ± 2.1b |
| Chl a (μg L−1) | 7.3 ± 0.2ab | 10.4 ± 6.2a | 5.4 ± 1.4b |
| TP (mg L−1) | 0.231 ± 0.138 | 0.182 ± 0.082 | 0.104 ± 0.033 |
| PO43− (mg L−1) | 0.070 ± 0.050 | 0.022 ± 0.010 | 0.024 ± 0.010 |
| TN (mg L−1) | 0.468 ± 0.091 | 0.411 ± 0.114 | 0.383 ± 0.132 |
| NO3− (mg L−1) | 0.180 ± 0.026 | 0.149 ± 0.077 | 0.173 ± 0.058 |
| Norg (mg L−1) | 0.193 ± 0.120 | 0.182 ± 0.074 | 0.139 ± 0.108 |
| Trophic state parameters | |||
| TSI SDT | 65.06 ± 2.53ab | 68.52 ± 2.16a | 62.92 ± 1.62b |
| TSI Chl a | 50.05 ± 0.25 | 52.52 ± 4.90 | 46.77 ± 2.83 |
| TSI TP | 80.33 ± 9.68a | 77.94 ± 6.99ab | 70.51 ± 4.71b |
| TSI TN | 41.45 ± 5.29ab | 38.47 ± 2.02a | 44.49 ± 1.44b |
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