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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 parameter

River system

ANOVA

Obudu

Opa

Esinmirin

F

p

pH

6.72 ± 0.78

6.59 ± 0.67

7.10 ± 0.40

1.165

0.364

EC (μS/cm)

104.61 ± 23.53

162.21 ± 63.19

184.23 ± 29.33

10.64

0.007

Organic carbon (%)

0.06 ± 0.02

0.07 ± 0.02

0.06 ± 0.02

0.213

0.813

NO3 (mg/L)

2.01 ± 0.96

2.00 ± 1.61

1.62 ± 0.87

0.239

0.792

PO43− (mg/L)

16.97 ± 11.24

15.37 ± 8.94

18.73 ± 4.87

0.263

0.776

SO42− (mg/L)

39.63 ± 8.25

51.55 ± 16.49

49.60 ± 10.97

1.713

0.244