Journal of Ecosystems / 2014 / Article / Tab 3

Research Article

Water Physicochemistry and Zooplankton Fauna of Aiba Reservoir Headwater Streams, Iwo, Nigeria

Table 3

Descriptive statistics and seasonal variation of water physicochemical parameters in Onikan lotic system (May 2013–March 2014).

ParameterDescriptive statisticsSeasonal variation Mann-Whitney test
MinimumMaximumMean ± S.D.Rainy seasonDry season value value

Water temperature (°C)24.829.026.4 ± 1.525.3 ± 0.627.6 ± 1.36.50.0784
Water depth (m)0.21.20.7 ± 0.40.8 ± 0.50.6 ± 0.4150.6892
Secchi depth (m)0.200.700.40 ± 0.210.36 ± 0.210.46 ± 0.2216.50.8729
Channel width (m)1.05.03.1 ± 1.43.6 ± 1.72.7 ± 1.015.50.7488
Flow velocity (m/s)00.330.092 ± 0.1290.113 ± 0.1410.067 ± 0.12480.1282
Discharge (m3/s)00.3000.102 ± 0.1260.113 ± 0.1310.089 ± 0.1339.50.2002
TS (mg/L)62198146 ± 47146 ± 36147 ± 63170.9362
TSS (mg/L)1213078 ± 4299 ± 2353 ± 485.50.0547
TDS (mg/L)3414468 ± 3747 ± 1894 ± 3990.1735
pH6.708.007.16 ± 0.467.17 ± 0.487.14 ± 0.4914.50.6312
Electrical conductivity (S/cm)85.0300.0175.2 ± 72.6127.4 ± 67.4190.0 ± 79.5100.2298
Total alkalinity (mgCaCO3/L)148239.0 ± 18.648.7 ± 17.827.3 ± 12.44.50.0374
(mg/L)00.980.56 ± 0.390.50 ± 0.410.64 ± 0.39180.9362
(mg/L)01.40.51 ± 0.420.42 ± 0.520.63 ± 0.27130.4712
Dissolved oxygen (mg/L)4.57.85.9 ± 1.25.1 ± 0.66.8 ± 1.18.50.1495

= 12, critical value of = 5 at < 0.05.

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