Abstract
The study aimed at determining spatial and temporal changes in physico-chemical water quality and planktonic composition in relation to rainfall patterns was carried out in Osinmo reservoir, an impoundment on the Ataro River, Osun State, Nigeria, over a period of six months (May–October 2011). The effect of rains and reservoir zonation on the investigated parameters varied widely. A wide range of DO, BOD5, organic carbon and transparency values was recorded both temporally and spatially. The rainfall pattern affected four out of the nine investigated chemical parameters (conductivity, alkalinity, carbonate and organic carbon). Water conductivity was found to be highly variable during the three phases of the annual rainy season. The lacustrine zone was characterised by the highest content of organic carbon, considerably differing from that in other zones, and the greatest abundance of plankton followed by that in the transitional zone. The variation in plankton abundance was highly significant (p < 0.05) t...
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