Greener Journal of Physical Sciences

Greener Journal of  Physical Sciences  Vol. 3 (4), pp. 142-148, May 2013.  

ISSN: 2276-7851 © 2011 Greener Journals

Research Paper

Manuscript Number: 022013482

 

Study of the Seasonal Variation in the Physico-Chemical Parameters of a Tropical Reservoir

 

^1*Idowu E.O.,² Ugwumba A.A.A., ³Edward J.B. and ⁴Oso J.A.

 

^1*,3,4Department of Zoology, Ekiti State University,  Ado-Ekiti, Nigeria.

²Department of Zoology, University of Ibadan, Ibadan, Nigeria.

 

^*1Correspondence Author’s Email: idowunice @ yahoo. com

Abstract:

The physico-chemical parameters of Ado-Ekiti Reservoir in Southwest region of Nigeria were investigated from May 2002 to July 2004. Monthly mean values of the parameters were; Temperature 27.7⁰C ± 1.60 (range 23.50⁰C to 30.04⁰C); Transparency 0.99m ± 0.26 (range 0.51 to 1.54m); pH 8.39 (range 5.63 to 9.82mg/l); Dissolved Oxygen (DO) 5.7±1.47mg/l (Range 4.08 to 8.98mg/l, Biochemical Oxygen Demand (BOD) 1.90 ± 0.61mg/l (range 0.93 to 3.20 mg/l); Alkalinity 45 ± 19.40mg CaCO₃/l (range 22.0 to 100.88 CaCO₃/l); Free Carbon dioxide 24.61±8.50ppm (range 16.50 to 47.50ppm). Results showed monthly variations of the physico-chemical parameters in the reservoir. Correlation coefficients (r) for all pairs of determined physico-chemical parameters showed that transparency had a significant correlation with Dissolved Oxygen (0.52) and pH (0.63) (p≤0.05 and 0.01 levels). Alkalinity had a positive correlation with pH (0.43) and low negative correlation (-0.30; -0.21) with DO and Free Carbon dioxide. Abundance of Hepsetusodoe positively correlated with dissolved oxygen and free carbon dioxide (r = 0.36 and 0.31) and negatively with pH, BOD and temperature (r = -20, 0.19, -0.01) respectively. These correlations were insignificant (p ≥ 0.05 level). All the values fell within recommended range for fish production.

 

Keywords: physico-chemical parameters, Tropical Reservoir, Abundance of H. odoe.

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