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ABSTRACT
A limnological study of phytoplankton composition of Aiakhuakhuari River in Oredo local government area was carried out from November 2015 to April 2016 to assess the water quality using phytoplankton composition of the river. Three sampling stations were chosen and phytoplankton samples were collected (using 55µm plankton net) and values for air temperature, water temperature, pH and total dissolved solids were estimated in situ. A total of 135 phytoplankton species were identified comprising 4 divisions namely; Bacillariophyta, Chlorophyta, Euglenophyta and Cyanophyta. Bacillariophyta, which was represented by two orders (Centrales and Pennales) dominated the phytoplankton taxa, accounting for 45.92% of the total phytoplankton composition. The division Chlorophyta made the second highest contribution (38.52%), with bulk belonging to the Order Zygnematales. The Euglenophyta which was represented by one order (Euglenales) and three genera (Euglena, Trachelomonas and Strombomonas) contributed 8.89%, while Cyanophyta made the least contribution (6.67%) and had 4 genera (Dactylococcus, Oscillatoria, Phormidium and Anabaena). The high and low relative abundance of Bacillariophyta and Cyanophyta, respectively, indicate that Aiakhuakhuari River is not polluted; it is highly productive and has low trophic status.
