Abstract
The physico-chemical parameters and plankton diversity of Awba Reservoir, University of Ibadan was sampled from April to July, 2011. Surface water samples were collected for physico-chemical parameters. Values of the physico-chemical parameters observed ranged as follows: water temperature, 24-26.5°C; air temperature, 22-23. °C; transparency, 0.2-0.4 m; pH, 7.3-8.4; total dissolved solids, 143.8-159.5 mg/L; conductivity, 290.8-391.5 μmhos/cm; salinity, 0.11-0.19%; dissolved oxygen, 0.7-1.8 mg/L and alkalinity, 0.8-1.7 mg CaCO<sub>3</sub>/L. Thirty six taxa of plankton were encountered. Phytoplankton consisted of five families namely; Cyanophyceae, Chlorophyceae, Euglenophyceae, Bacillariophyceae and Dinophyceae. Three groups of zooplankton encountered were copepods, cladocerans and rotifers. The presence of pollution indicator species such as, <em>Microcystis</em>, <em>Phacus</em>, <em>Oscillatoria</em>, <em>Surirella Closterium</em>, <em>Aphanocapsa</em>, <em>Anabeana</em> and <em>Euglena</em> show that the Reservoir is likely polluted.
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