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Table 6 Mean, mean standard error and range of nutrient concentrations (mg L−1) measured in sampling sites at Lake Ziway in dry 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 PO4-P NO2-N NO3-N NH3-N TIN TN SiO2-Si
B x̄ ± Std. Err 0.12 ± 0.02 0.06 ± 0.01 0.48 ± 0.20 0.17 ± 0.04 0.21 ± 0.05 0.85 ± 0.25 5.7 ± .25 46.2 ± 6.2
Range 0.06–0.15 0.04–0.08 0.188–1.3 0.06–0.25 0.1–0.35 0.34–1.8 4.9–6.4 32–68
C x̄ ± Std. Err 0.14 ± 0.02 0.05 ± 0.01 0.29 ± 0.05 0.26 ± 0.17 0.17 ± 0.03 0.72 ± 0.22 9.1 ± 0.65 46.8 ± 2.4
Range 0.1–0.185 0.03–0.07 0.18–0.41 0.01–0.91 0.09–0.26 0.29–1.5 7.34–11.20 39.5–54
Fa x̄ ± Std. Err 0.14 ± 0.02 0.05 ± 0.01 0.96 ± 0.22 0.38 ± 0.13 0.24 ± 0.04 1.6 ± 0.36 6.1 ± .6 46.8 ± 4.9
Range 0.105–0.23 0.03–0.1 0.6–1.8 0.1–0.75 0.15–0.35 0.9–2.9 4.5–8.3 35–60
Fb x̄ ± Std. Err 0.19 ± 0.05 0.08 ± 0.03 1.7 ± 0.44 0.58 ± 0.19 0.29 ± 0.05 2.6 ± 0.6 8.1 ± .56 91.39.8
Range 0.05–0.32 0.04–0.16 0.72–2.89 0.08–0.97 0.15–0.42 1.0–4.2 6.5–9.8 56.9–114
Ka x̄ ± Std. Err 0.13 ± 0.02 0.05 ± 0.01 0.35 ± 0.08 0.12 ± 0.02 0.22 ± 0.05 0.68 ± 0.10 7.1 ± 1.1 50.5 ± 6.7
Minimum 0.09–0.19 0.04–0.07 0.155–0.64 0.08–0.18 0.10–0.4 0.40–0.95 5.0–11 40.1–77
Kb x̄ ± Std. Err 0.17 ± 0.03 0.05 ± 0.01 0.34 ± 0.03 0.22 ± 0.05 0.34 ± 0.03 0.89 ± 0.08 9.2 ± 1.3 68 ± 7.8
Range 0.08–0.24 0.04–0.09 0.24–0.42 0.07–0.35 0.24–0.42 0.76–1.2 14-Jul 43–88.7
Ko x̄ ± Std. Err 0.12 ± 0.02 0.05 ± 0.01 0.32 ± 0.09 0.10 ± 0.03 0.2 ± 0.04 0.62 ± 0.14 9.7 ± .42 39 ± 3.4
Range 0.07–0.19 0.04–0.07 0.05 ± 0.188 0.01–0.18 0.09–0.3 0.3–1.2 8.5–11 30–47
Ma x̄ ± Std. Err 0.14 ± 0.02 0.05 ± 0.01 0.23 ± 0.08 0.10 ± 0.02 0.17 ± 0.03 0.55 ± 0.08 6.3 ± .49 49 ± 3.8
Range 0.09–0.2 0.04–0.06 0.1–0.53 0.04–0.14 0.114–0.3 0.35–0.8 4.8–7.6 38–62
Mb x̄ ± Std. Err 0.97 ± 0.75 0.06 ± 0.01 0.41 ± 0.17 0.28 ± 0.19 0.41 ± 0.17 1.3 ± 0.53 9.4 ± 1.2 61.3 ± 3.9
Range 0.2–3.95 0.04–0.08 0.06–1.1 0.03–1.1 0.1–1.1 0.21–3.2 5.6–13 50.8–73