Skip to main content

Table 1 Physico-chemical parameters of water in Opa Reservoir’s tributaries (September 2004–July 2005)

From: Biological assessment of the headwater rivers of Opa Reservoir, Ile-Ife, Nigeria, using ecological methods

Water parameterRiver systemANOVA
ObuduOpaEsinmirinFp
Water temperature (°C)26.14 ± 0.9526.23 ± 0.6526.37 ± 1.430.0500.952
pH7.30 ± 0.147.31 ± 0.167.57 ± 0.174.6600.048
EC (μS/cm)122.59 ± 12.58170.76 ± 77.57207.89 ± 68.624.5760.071
DO (mg/L)5.31 ± 0.714.62 ± 0.685.11 ± 1.011.2210.345
BOD5 (mg/L)1.71 ± 0.401.72 ± 0.602.21 ± 0.711.1560.367
Total alkalinity (mgCaCO3/L)44.16 ± 7.4656.50 ± 37.4277.50 ± 35.902.3510.186
Total acidity (mgCaCO3/L)25.50 ± 3.7825.00 ± 4.5426.83 ± 6.010.1490.864
Organic carbon (mg/L)2.82 ± 1.032.02 ± 1.162.02 ± 0.631.196.751
Ca2+ (mg/L)9.58 ± 2.0615.50 ± 7.7720.96 ± 7.266.8240.032
Mg2+ (mg/L)2.23 ± 0.693.65 ± 2.757.37 ± 4.044.5510.070
NO3 (mg/L)1.26 ± 0.211.27 ± 0.221.14 ± 0.230.5640.591
PO43− (mg/L)0.71 ± 0.280.51 ± 0.210.26 ± 0.097.830.022