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Short Term Effects of Hydrocarbons on the Photosynthesis and Respiration of Some Phytoplankton Species

The short term effects of hydrocarbons on photosynthesis, respiration and distribution of end products was studied in the planktonic algae, Cydotella cryptica, Pavlova lutheri and Skeletonema costatum. Stimulation of photosynthesis was observed in all cases with low oil concentrations while higher concentrations caused inhibition. The toxicity levels seem to be correlated with the cell wall which may play a protective role. The effect on respiration was less severe compared to photosynthesis. The pattern of the distribution of the end products shows a decrease in biosynthesis of metabolic intermediates and lipids and an increase in biosynthesis of polysaccharides and proteins. These results suggest that the photosynthetic mechanism is mainly affected.