S. A.
Akinyemi D. I.
Nwankwo ABSTRACT Studies on the effect of seasons on phytoplankton of the Asejire Reservoir were carried out for two years. Two sets of water samples were collected, one to test for physical and chemical characteristics and the second sample for identification of phytoplankton species in the reservoir. The physico-chemical parameters showed significant variations for rainy and dry seasons. The most abundant phytoplankton species was Microcystis aeruginosa Kütz., which has been reported in the literature as toxin-producing alga. Variations in the abundance of phytoplankton were influenced by the changes in the chemical characteristic of the water.
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