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Table 1

Mean value (range in parentheses) from three water system sites in July 2017

Environment variablesAbbreviationWRSJRSBRSP
n = 15n = 17n = 12
Altitude (m) Altit 913 (340–2,452) 1,049 (410–1,950) 821 (340–1,360) 0.162 
Water temperature (°C) WT 22 (6.5–28.5) 21.5 (9.0–25.5) 26 (20.3–29.5) 0.088 
River width (m) Width 73.99 (12.3–210) 40.21 (16.9–105) 33.13 (2.5–133) 0.033* 
River depth (m) Depth 0.47 (0.2–1) 0.47 (0.25–0.65) 0.42 (0.25–0.5) 0.671 
Water velocity (m/s) Velocity 0.54 (0.29–1.02) 0.55 (0.1–1.29) 0.52 (0.07–1.27) 0.901 
Flux (m3/s) Flux 16.53 (2.87–70.40) 8.71 (1.93–19.53) 6.11 (0.47–16.46) 0.088 
Secchi depth (m) SD 0.16 (0.07–0.52) 0.10 (0–0.35) 0.08 (0–0.3) 0.134 
Dissolved oxygen (mg/L) DO 8.45 (5.55–10.03) 8.69 (7.24–11.92) 9.36 (3.98–13.93) 0.79 
pH pH 9.00 (8.16–9.59) 9.31 (8.01–10.05) 9.63 (9.05–10.14) 0.001** 
Electrical conductivity (μs/cm) EC 837.07 (391–1,618) 789.02 (132.4–1,893) 1,274.33 (336–2,155) 0.075 
Total dissolved solids (mg/L) TDS 372.75 (125–845) 682.45 (89.6–2,115) 893.17 (312–1,944) 0.003* 
Total nitrogen (mg/L) TN 5.55 (1.09–8.21) 4.81 (1.84–9.76) 5.86 (2.78–10.05) 0.423 
Total phosphorus (mg/L) TP 0.11 (0.03–0.25) 0.20 (0.03–1.95) 0.13 (0.02–0.47) 0.808 
Nitrate (mg/L) NO3-N 2.31 (0.19–4.19) 1.21 (0.04–2.50) 1.65 (0.47–3.59) 0.018* 
Ammonium (mg/L) NH4-N 0.34 (0.09–0.63) 0.31 (0.10–0.82) 0.29 (0.01–0.74) 0.687 
Potassium (mg/L) K+ 5.07 (0.49–14.68) 5.12 (0.50–11.87) 5.21 (3.82–7.25) 0.683 
Magnesium (mg/L) Mg2+ 21.28 (7.64–59.54) 52.05 (4.87–131.69) 70.40 (20.6–135.72) 0.000** 
Chloride (mg/L) Cl- 145.36 (1.02–380.23) 265.71 (0.84–824.23) 486.26 (160.89–960.55) 0.008* 
Environment variablesAbbreviationWRSJRSBRSP
n = 15n = 17n = 12
Altitude (m) Altit 913 (340–2,452) 1,049 (410–1,950) 821 (340–1,360) 0.162 
Water temperature (°C) WT 22 (6.5–28.5) 21.5 (9.0–25.5) 26 (20.3–29.5) 0.088 
River width (m) Width 73.99 (12.3–210) 40.21 (16.9–105) 33.13 (2.5–133) 0.033* 
River depth (m) Depth 0.47 (0.2–1) 0.47 (0.25–0.65) 0.42 (0.25–0.5) 0.671 
Water velocity (m/s) Velocity 0.54 (0.29–1.02) 0.55 (0.1–1.29) 0.52 (0.07–1.27) 0.901 
Flux (m3/s) Flux 16.53 (2.87–70.40) 8.71 (1.93–19.53) 6.11 (0.47–16.46) 0.088 
Secchi depth (m) SD 0.16 (0.07–0.52) 0.10 (0–0.35) 0.08 (0–0.3) 0.134 
Dissolved oxygen (mg/L) DO 8.45 (5.55–10.03) 8.69 (7.24–11.92) 9.36 (3.98–13.93) 0.79 
pH pH 9.00 (8.16–9.59) 9.31 (8.01–10.05) 9.63 (9.05–10.14) 0.001** 
Electrical conductivity (μs/cm) EC 837.07 (391–1,618) 789.02 (132.4–1,893) 1,274.33 (336–2,155) 0.075 
Total dissolved solids (mg/L) TDS 372.75 (125–845) 682.45 (89.6–2,115) 893.17 (312–1,944) 0.003* 
Total nitrogen (mg/L) TN 5.55 (1.09–8.21) 4.81 (1.84–9.76) 5.86 (2.78–10.05) 0.423 
Total phosphorus (mg/L) TP 0.11 (0.03–0.25) 0.20 (0.03–1.95) 0.13 (0.02–0.47) 0.808 
Nitrate (mg/L) NO3-N 2.31 (0.19–4.19) 1.21 (0.04–2.50) 1.65 (0.47–3.59) 0.018* 
Ammonium (mg/L) NH4-N 0.34 (0.09–0.63) 0.31 (0.10–0.82) 0.29 (0.01–0.74) 0.687 
Potassium (mg/L) K+ 5.07 (0.49–14.68) 5.12 (0.50–11.87) 5.21 (3.82–7.25) 0.683 
Magnesium (mg/L) Mg2+ 21.28 (7.64–59.54) 52.05 (4.87–131.69) 70.40 (20.6–135.72) 0.000** 
Chloride (mg/L) Cl- 145.36 (1.02–380.23) 265.71 (0.84–824.23) 486.26 (160.89–960.55) 0.008* 

The value of n is the number of water samples in the sites. Variables significantly different among the river systems with p < 0.05 and p < 0.001 are marked (based on the ANOVA).

*p < 0.05; **p < 0.001.

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