Table 1
Mean and standard deviations of environmental parameters of the Foum-Gleita reservoir (Mauritania) during one-year study period (from September 2017 to August 2018). T: surface water temperature; pH: water hydrogen potential; Secchi: secchi disk depth; DO: dissolved oxygen; N-NO3 –: nitrate; N-NO2 –: nitrite; N-NH4 +: ammonium; DIN: dissolved inorganic nitrogen; P-PO4 −3: dissolved phosphorus (DIP); TP: total phosphorus; DIN/TP: DIN:TP mass ratio; Fe: iron; Chl-a: chlorophyll a. The significance of the regression coefficients (Pearson?s r) is indicated by *0.01 < p < 0.05, **0.001 < p < 0.01, and ***p < 0.001.Values followed by the different letters are significantly different (p < 0.05). N: number of samples; SD: standard deviation; *: p < 0.05.
| Parameters | S1 (N = 12) | S2 (N = 12) | S3 (N = 12) | Difference between sites (one- way ANOVA) |
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| Mean ± SD | Range | Mean ± SD | Range | Mean ± SD | Range | F | p-values | ||
| T (°C) | 27.8 ± 3.6 | 20.2–30.3 | 27.8 ± 3.6 | 20.3–30.4 | 27.36 ± 3.4 | 21.1–30.2 | F2, 33 = 0.040 | 0.996 | |
| DO (mg L−1) | 10.06 ± 2.55 | 6.20–15.4 | 9.55 ± 2.94 | 6.60–17.8 | 7.83 ± 2.90 | 5.00–14.7 | F2, 33 = 2.022 | 0.148 | |
| pH | 7.6 ± 0.2 | 7.1–7.9 | 7.5 ± 0.2 | 7.1–7.96 | 7.6 ± 0.27 | 7.1–8.06 | F2, 33 = 0.604 | 0.553 | |
| Salinity (psu) | 0.27 ± 0.08 | 0.19–0.51 | 0.26 ± 0.07 | 0.20–0.49 | 0.27 ± 0.07 | 0.22–0.47 | F2, 33 = 0.058 | 0.943 | |
| Secchi (m) | 0.32 ± 0.09 | 0.19–0.45 | 0.31 ± 0.10 | 0.16–0.45 | 0.33 ± 0.10 | 0.19–0.48 | F2, 33 = 0.132 | 0.877 | |
| N-NO3 – (mg L−1) | 3.03 ± 1.45 | 1.22–5.13 | 3.53 ± 1.22 | 1.72–5.06 | 4.19 ± 1.37 | 1.89–6.17 | F2, 33 = 2.221 | 0.124 | |
| N-NO2 – (mg L−1) | 0.03 ± 0.01a | 0.01–0.06 | 0.03 ± 0.01a | 0.02–0.06 | 0.06 ± 0.02b | 0.03–0.13 | F2, 33 = 6.434 | 0.004* | |
| N-NH4 + (mg L−1) | 0.19 ± 0.05a | 0.12–0.28 | 0.14 ± 0.03b | 0.11–0.21 | 0.20 ± 0.05ac | 0.13–0.27 | F2, 33 = 5.503 | 0.009* | |
| DIN (mg L−1) | 3.27 ± 1.44 | 1.39–5.32 | 3.71 ± 1.22 | 1.87–5.23 | 4.46 ± 1.36 | 2.16–6.53 | F2, 33 = 2.386 | 0.108 | |
| P-PO4 −3 (mg L−1) | 0.28 ± 0.10 | 0.15–0.42 | 0.24 ± 0.05 | 0.16–0.32 | 0.30 ± 0.13 | 0.15–0.50 | F2, 33 = 1.228 | 0.306 | |
| TP (mg L−1) | 0.32 ± 0.09 | 0.22–0.44 | 0.27 ± 0.05 | 0.21–0.36 | 0.36 ± 0.14 | 0.23–0.56 | F2, 33 = 2.312 | 0.115 | |
| DIN/TP | 11.99 ± 7.41 | 3.39–21.28 | 14.51 ± 6.74 | 5.19–22.74 | 1 3.49 ± 7.77 | 4.70–23.00 | F2, 33 = 0.505 | 0.608 | |
| Fe (mg L−1) | 0.12 ± 0.05 | 0.08–0.24 | 0.15 ± 0.04 | 0.10–0.25 | 0.15 ± 0.06 | 0.06–0.26 | F2, 33 = 0.905 | 0.414 | |
| Chl-a (μg L−1) | 6.62 ± 2.03a | 4.15–10.65 | 7.17 ± 2.27ab | 4.23–11.13 | 10.16 ± 4.91b | 4.16–18.11 | F2, 33 = 3.899 | 0.030* | |
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