Summary and Conclusions

Abstract

In the preceding sections several areas have been identified in which information is lacking. In some cases, apparent inconsistencies also exist in the findings and observations of different groups of workers. This may have impaired our understanding of the effects and behaviour of oil- derived hydrocarbons in freshwater systems. The problems presented by hydrocarbon contaminants are not static. New developments or changes in activities, such as industrial practices, combined with the escalating demands that we place on freshwater resources, continually create new areas of uncertainty. The relative importance of different aspects of hydrocarbon pollution may also change. Similarly, unforseen hazards may arise; new oil-based products and synthetic analogues, including their additives and combustion products, may prove to be examples of this. The aim of this section is to provide a summary of some of the major points that have arisen out of the review and to draw attention to areas in need of further study.