Table 3 Variation in the malacological and environmental factors of the screened watercourses across different months (Kafr El-Sheikh, 2019)
Parameter | Month median (IQR) | Z | P | |||
|---|---|---|---|---|---|---|
July | August | September | November | |||
Number of collected snails/ spot | 2.00 (10.00) | 7.00 (32.50) | 0.00 (5.50) | 0.00 (5.50) | 12.74 | 0.005** |
Number of B. alexandrina | 0.00 (3.50) | 2.00 (17.50) | 0.00 (3.00) | 0.00 (3.00) | 12.94 | 0.005** |
Salinity(mg/L) | 253.50 (215.75) | 352.90 (305.32) | 351.07 (218.80) | 363.10 (346.87) | 12.39 | 0.006** |
pH | 6.81 (0.30) | 6.87 (0.17) | 6.90 (0.15) | 6.85 (0.21) | 2.87 | 0.412 |
Temperature (°C) | 31 (0.00) | 32 (0.00) | 30 (0.00) | 29 (0.00) | 135 |  < 0.001** |
TDS (mg/L) | 360.00 (450.17) | 463.67 (381.00) | 462.00 (276.50) | 448.00 (224.50) | 3.36 | 0.339 |
Turbidity (NTU) | 13.09 (18.89) | 9.65 (26.76) | 9.00 (13.75) | 16.00 (27.74) | 13.92 | 0.003** |
TC (MPN/100 ml) | 1.62 × 104 (4.49 × 104) | 1.10 × 105 (9.49 × 105) | 1.10 × 103 (4.59 × 105) | 4.47 × 105 (1.60 × 106) | 31.89 |  < 0.001** |
Escherichia coli (MPN/100 ml) | 2.20 × 103 (1.78 × 103) | 4.66 × 103 (1.25 × 105) | 1.69 × 102 (1.09 × 105) | 3.99 × 104 (8.45 × 104) | 31.41 |  < 0.001** |
Vegetation (%) | 80.00 (30.0) | 60.00 (70.00) | 80.00 (90.00) | 90.00 (60.00) | 6.66 | 0.084 |