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Table 7 Mean, mean standard error and range of nutrient concentrations (mg L−1) measured in sampling sites at Lake Ziway in wet season(TP for total phosphorus in mg L−1; SRP for soluble reactive phosphorus in mg L−1; NO2-N for nitrite-nitrogen in mg L−1; NO3-N for nitrate-nitrogen in mg L−1; NH4-N for ammonia–nitrogen in mg L−1; TIN for total inorganic nitrogen in mg L−1; TN for total nitrogen in mg L−1; SiO2-Si for soluble silica in mg L−1)

From: Assessment of spatio-temporal variations of selected water quality parameters of Lake Ziway, Ethiopia using multivariate techniques

Site TP(mg/L) PO4-P NO2-N NO3-N NH3-N TIN TN SiO2-Si
B x̄ ± Std. Err 0.35 ± 0.1 0.046 ± 0.01 0.47 ± 0.06 0.15 ± 0.03 0.11 ± 0.02 0.73 ± 0.08 5.13 ± 1.20 35.5 ± 11.60
Range 0.21–0.42 0.04–0.06 0.35–0.53 0.08–0.20 0.07–0.13 0.57–0.86 2.8–7.00 12.37–47.30
C x̄ ± Std. Err 0.38 ± 0.023 0.05 ± 0.01 0.33 ± 0.12 0.17 ± 0.12 0.09 ± 0.01 0.59 ± 0.24 6.02 ± 0.26 43.6 ± .72
Range 0.34–0.41 0.03–0.08 0.21–0.57 0.05–0.41 0.08–0.10 0.352–1.1 5.60–6.5 42.9–45.1
Fa x̄ ± Std. Err 0.29 ± 0.12 0.05 ± 0.01 0.74 ± 0.22 0.26 ± 0.12 0.09 ± 0.03 1.1 ± 0.33 7.0 ± 0.81 36 ± 7.5
Range 0.18–0.52 0.04–0.07 0.43–1.2 0.03–0.39 0.03–0.14 0.48–1.62 5.6–8.4 22.2–47.7
Fb x̄ ± Std. Err 0.42 ± 0.175 0.11 ± 0.04 0.89 ± 0.44 0.44 ± 0.19 0.09 ± 0.04 1.42 ± 0.62 6.66 ± 0.53 39.2 ± 26
Range 0.17–0.75 0.04–0.16 0.34–1.8 0.17–0.80 0.02–0.15 0.75–2.7 5.6–7.4 5.8–90.5
Ka x̄ ± Std. Err 0.23 ± 0.02 0.05 ± 0.01 0.84 ± 0.16 0.47 ± 0.04 0.09 ± 0.03 1.39 ± .18 7.6 ± 0.43 37.9 ± 4.68
Range 0.20–0.27 0.04–0.07 0.5—1.1 0.4–0.54 0.03–0.12 1.1 ± 1.7 7–8.4 30.3–46.45
Kb x̄ ± Std. Err 0.73 ± 0.27 0.06 ± 0.01 1.2 ± 0.20 0.86 ± 0.22 0.15 ± 0.10 2.2 ± .50 8.1 ± 0.86 38.15 ± 17.10
Range 0.24–1.2 0.05–0.08 0.89–1.6 0.52–1.3 0.05–0.3 1.5–3.1 7–9.8 11.24–70
Ko x̄ ± Std. Err 0.27 ± 0.08 0.05 ± 0.01 0.42 ± 0.12 0.20 ± 0.04 0.08 ± 0.02 0.7 ± 0.12 12 ± 1.9 34.3 ± 11
Range 0.12–0.376 0.04–0.07 0.2–0.6 0.1–0.3 0.05–0.1 0.5–0.9 8.4–14 12.6–48.2
Ma x̄ ± Std. Err 0.24 ± 0.04 0.06 ± 0.02 0.76 ± 0.06 0.23 ± 0.11 0.08 ± 0.02 1.06 ± 0.14 6.1 ± .55 42.62 ± 1.9
Range 0.19–0.33 0.04–0.082 0.66–0.86 0.01–0.369 0.03–0.11 0.8–1.3 4.97–7 38.96–45.42
Mb x̄ ± Std. Err 1.0 ± 0.30 0.09 ± 0.02 1.02 ± .2 0.50 ± 0.24 0.16 ± 0.06 1.66 ± .48 13.5 ± 4.5 39.1 ± 14.72
Range 0.47–1.5 0.06–0.12 0.7–1.42 0.02–0.75 0.05–0.23 0.76–2.4 5.6–21 11.2–61.2