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Abstract
The composition of periphyton community on water hyacinth was investigated at Ejirin, part of Epe Lagoon, in relation to environmental characteristics from December 2012 to May 2013. A total of 14,536 individuals of 104 species belonging to five divisions were identified, with Bacillariophyta (82.69%), Cyanobacteria (10.43%), Chlorophyta (5.63%), and Euglenophyta (1.15%). The total species abundance observed showed a strong correlation with rainfall (r = 0.745) and strongly significant correlation with TDS (r=0.836*;P >0.05). Biochemical oxygen demand value remained (BOD)≤4.8 mg/L while Shannon-Wiener index value remained (Hs)≤ 1.47. The presence of the following organisms could be used as an indicator of environmentally stressed aquatic ecosystem: euglenoids, blue green algae,Nitzschia palea,Surirellasp.,Pinnulariasp.,Gomphonema parvulum,Mougeotiasp.,Spirogyrasp.,Trachelomonas affinis(Lemm.), andT. ensifera Daday; T. gibberosaPlayf. andPhormidium articulatum;Lyngbya intermedia;Cymbella ventricosa;Eunotia arcus;Surirella linearisandClosterium parvulumNag.
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