Bamigboye O. O. and Fagade O. E.
Changes in the composition and diversity of chlorophyceae and cyanophyceae algae during biodegradation of 2% forcados blend crude in a semi-natural contaminated aquatic ecosystem was studied. FOOD 3 bacteria inocula served as oil degrader with changes in nutrient levels and an oil dispersant – “ESSO”. Filamentous algal forms dominated species encountered with coelosphaerium and volvox as the colonial forms found. Changes in algal counts over a two week period is reported. Growth medium made up of crude oil and dispersant was more deleterious to algae growth than that containing oil alone. Green algae were more susceptible to toxic effect of crude and dispersant than the blue green algae. Anabaena and Oscillatoria were least susceptible to toxic effect of the oil/dispersant. Spirogyra and Ulothrix are being proposed as test organisms for the dispersant toxicity test based on their susceptibility within 4 days of exposure to dispersant concentrations between 1.5% and 2.5%.
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