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Table 2 Sediment characteristics of Opa Reservoir’s tributaries (September 2004–July 2005)

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

Sediment parameterRiver systemANOVA
ObuduOpaEsinmirinFp
pH6.72 ± 0.786.59 ± 0.677.10 ± 0.401.1650.364
EC (μS/cm)104.61 ± 23.53162.21 ± 63.19184.23 ± 29.3310.640.007
Organic carbon (%)0.06 ± 0.020.07 ± 0.020.06 ± 0.020.2130.813
NO3 (mg/L)2.01 ± 0.962.00 ± 1.611.62 ± 0.870.2390.792
PO43− (mg/L)16.97 ± 11.2415.37 ± 8.9418.73 ± 4.870.2630.776
SO42− (mg/L)39.63 ± 8.2551.55 ± 16.4949.60 ± 10.971.7130.244