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Abstract
A study of the plankton abundance in the shore, surface and bottom of Lake Lekan-Are Abeokuta, Ogun State, Nigeria was carried out between January 2007 and August 2008 at three stations along the entire stretch of the lake. The numerical abundance of the plankton in this lake was investigated. There were marked seasonal variations in the zooplankton and phytoplankton of the lake. Four major groups of phytoplankton were identified Baccilariophyceae (diatoms), Chlorophyceae (green algae) and Cyanophyceae (blue green). The green algae dominated the phytoplankton constituting 63.3% in the surface and 54.8% in the bottom zone of the lake. The phytoplankton density was at its peak in sunny months of January to early June that coincided with the period of high temperature. The three major groups of zooplankton observed in the lake were Cladocera, Copepoda and Rotifera. The Copepoda dominated the three habitats 83.37% (shore), 82.73% (surface) and 80.26% (bottom). Copepoda also dominated at the three stations of the lake. The  seasonality of zooplankton followed a similar pattern with that of the phytoplankton reaching a peak between February and May.Keywords: Numerical abundance, plankton Lekan Area, Nigeria
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