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|Title:||Temperature-Oxygen Regimes of SomeTropical Steams in South-Western Nigeria|
|Authors:||Ikhile, C. I.|
|Publisher:||Port Harcourt Journal of Social Sciences, (PHJSS) University of Port Harcourt, Port Harcourt, Rivers State, Nigeria|
|Abstract:||The temperature-oxygen variations in seven rivers (Orle, Edion, Ojo, Owan, Ule, Obvioti, Oruen) located in the tropical rain forest area of Edo State, Nigeria were studied in the periods 1987 and 1997. In 1987 air temperatures ranged from 29.0°C — 37.0°C and water temperatures ranged between 21.00 — 34.0°C. Values were lower for air temperatures in the dry season (29.5 — 37.0°C) than in the wet season (30.0 — 37.0°C); and water temperatures were generally higher in the wet season (range 25 — 33°C) than in the dry season (range 21 — 34°). In 1997, the temperature of the rivers ranged from 20.0 — 29°C while air temperatures range from 26 — 34°C, being generally higher in the dry season than in the wet season. Dissolved Oxygen (DO) in 1987 was generally low (ranging from 2.1 — 36.8 mg/I); being lower in the dry than in the wet seasons while in 1997, DO for the rivers ranged between 0.30 — 2.20mg/l and were generally low especially during the dry periods of the year. Various factors were attributed to the regimes of Temperature and Dissolved Oxygen namely: (i) Effect of sunlight and cold harmattan winds that lower temperatures of air and water to different extents, (ii) Effect of mixing and turbulence in the river flow on the DO as observed for River Ule, (iii) Effect of vegetative cover in the river location, but most importantly is, (iv) The effect of global temperature changes/warming. There was a significant statistical difference between the dry and wet seasons at 0.05 for Dissolve Oxygen in 1987. Negative correlation between Dissolved Oxygen (DO) and Temperature in all rivers in 1997 come in with various observations (ohagi, 1983 and Prekeyi 1994) which were explained as due to the slowing down of aeration of water bodies with increase temperature, solubility of oxygen varying inversely with temperature. (Sheat et al 1969; Lamb, 1993).|
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