Research Article
Water Physicochemistry and Zooplankton Fauna of Aiba Reservoir Headwater Streams, Iwo, Nigeria
Table 2
Descriptive statistics and seasonal variation of water physicochemical parameters in Aiba lotic system (May 2013–March 2014).
| | Parameter | Descriptive statistics | Seasonal variation |
Mann-Whitney test | | Minimum | Maximum | Mean ± S.D. | Rainy season | Dry season | | |
| | Water temperature (°C) | 24.5 | 29.0 | 26.4 ± 1.6 | 26.0 ± 1.3 | 26.9 ± 2.0 | 12.5 | 0.4237 | | Water depth (m) | 0.6 | 1.8 | 1.0 ± 0.4 | 1.0 ± 0.4 | 1.0 ± 0.4 | 17 | 0.9362 | | Secchi depth (m) | 0.10 | 0.90 | 0.41 ± 0.22 | 0.35 ± 0.21 | 0.47 ± 0.24 | 13.5 | 0.5222 | | Channel width (m) | 10.0 | 18.0 | 14.7 ± 2.7 | 14.7 ± 3.2 | 14.7 ± 2.5 | 17 | 0.9362 | | Flow velocity (m/s) | 0 | 0.05 | 0.016 ± 0.017 | 0.02 ± 0.02 | 0.011 ± 0.008 | 18 | 0.9362 | | Discharge (m3/s) | 0 | 1.440 | 0.334 ± 0.491 | 0.178 ± 0.127 | 0.165 ± 0.164 | 17 | 0.9362 | | TS (mg/L) | 86 | 773 | 191 ± 188 | 132 ± 62 | 251 ± 257 | 8 | 0.1282 | | TSS (mg/L) | 16 | 643 | 127 ± 169 | 96 ± 58 | 157 ± 240 | 16 | 0.8102 | | TDS (mg/L) | 30 | 130 | 64 ± 31 | 36 ± 5 | 86 ± 25 | 0 | 0.0051 | | pH | 6.65 | 8.30 | 7.24 ± 0.55 | 7.50 ± 0.66 | 6.97 ± 0.26 | 8 | 0.1285 | | Electrical conductivity (S/cm) | 90.0 | 186.0 | 121.7 ± 29.8 | 116.7 ± 19.7 | 126.7 ± 38.8 | 17 | 0.9362 | | Total alkalinity (mgCaCO3/L) | 16.0 | 62.0 | 36.3 ± 14.6 | 39.4 ± 15.1 | 33.3 ± 14.7 | 14 | 0.5752 | | (mg/L) | 0 | 2.09 | 0.75 ± 0.65 | 0.45 ± 0.35 | 1.05 ± 0.76 | 10 | 0.2298 | | (mg/L) | 0 | 1.25 | 0.57 ± 0.42 | 0.43 ± 0.43 | 0.71 ± 0.37 | 11.5 | 0.3367 | | Dissolved oxygen (mg/L) | 0.7 | 7.5 | 4.3 ± 2.2 | 3.7 ± 1.6 | 4.9 ± 2.7 | 14 | 0.5752 |
|
|
= 12, critical value of = 5 at < 0.05.
|
