Fig. 3
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Line graphs representing the evolution of a) pH; b) dissolved oxygen (%); c) ammonium (mg/L); d) nitrates (mg/L) and e) total phosphorus (mg/L) content for each sampling month. The lines represent the studied ponds. The grey limit represents range values for Good Ecological Potential: 6 ≤ pH ≤ 9; 60% ≤ O2% ≤ 120%; TP ≤ 0.13 mg/L ; NH4 + ≤ 1 mg/L; NO3 − ≤ 25 mg/L.
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