Inhibition of phytoplankton photosynthesis by the WSF of used lubricating oil |
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| Authors: | GC Bate Stephanie D Crafford |
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| Institution: | 1. Department of Botany, Institute for Coastal Research, University of Port Elizabeth, P.O. Box 1600, Port Elizabeth, South Africa 6000;2. State Laboratory for Tissue Immunology, Private Bag 4, Observatory, South Africa 7935 |
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| Abstract: | The photosynthetic rates of five phytoplankton species were inhibited following treatment with the water-soluble fractions (WSF) of used lubricating oil. Exhaust oil from an outboard motor inhibited photosynthesis in three out of the five species tested which indicates a species specific response in the case of this form of oil pollution. Water-soluble fractions from Qatar crude had no inhibitory effect on any of the species tested but had a stimulatory effect on the photosynthetic rate of one species. Both oxygen evolution and carbon assimilation were inhibited by the water-soluble fraction of used lubricating oil. In four out of five species, used lubricating oil WSF caused a net oxygen consumption during the light phase rather than a net oxygen release. These data indicate that used lubricating oil water-soluble fractions are especially toxic to phytoplankton. |
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