Research Article
Seasonal Dynamics in Bacteriological and Physicochemical Water Quality of the Southern Gulf of Lake Tana
Table 2
Median count (standard error) of coliform counts in water samples collected from Southern Gulf of Lake Tana (n = 36), 2021.
| Coliform | Site | Season | Median (SE) | Range | Mean rank | Mann–Whitney U test | -Value (asymp. sign) |
| FC | Impacted | Dry | 14 (9.2) | 1-280 | 53.86 | 59 | ≤0.01 | Reference | Dry | 1 (0.23) | 1-7 | 20.14 | | | Impacted | Wet | 1600 (123.7) | 2-1600 | 40.5 | 505 | 0.86 | Reference | Wet | 350 (120.8) | 2-1600 | 32.5 | | | Impacted | Dry | 14 (9.2) | 1-280 | 23.03 | 235 | ≤0.01 | Impacted | Wet | 1600 (123.7) | 2-1600 | 47.97 | | | Reference | Dry | 1 (0.23) | 1-7 | 19.575 | 38.5 | ≤0.01 | Reference | Wet | 350 (120.8) | 2-1600 | 53.43 | | |
| TC | Impacted | Dry | 1600 (70.4) | 500-1650 | 52.68 | 65 | ≤0.01 | Reference | Dry | 14 (67.06) | 1-1650 | 20.32 | | | Impacted | Wet | 1600 (46.6) | 500-1600 | 36.85 | 635.5 | 0.815 | Reference | Wet | 1600 (90.2) | 2-1600 | 36.15 | | | Impacted | Dry | 1600 (70.4) | 500-1650 | 30.4 | 543.5 | 0.186 | Impacted | Wet | 1600 (46.6) | 500-1600 | 33.60 | | | Reference | Dry | 14 (67.06) | 1-1650 | 23.57 | 182.5 | ≤0.01 | Reference | Wet | 1600 (90.2) | 2-1600 | 49.43 | | |
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Note. Impacted sites (sites 1 to 4); Reference sites (sites 5 to 8).
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