Use of recycled petroleum products to control road dust is a potential hazard 

 to vulnerable nursery areas of anadromous fishes in the Pacific Northwest. 

 Long-term cumulative effects of stack emissions from coal-fired power plants 

 are difficult to predict and may present unanticipated contaminant stresses. 



Research must continue to emphasize the study of basic principles that 

 regulate individual, population, and ecosystem life processes, while paying 

 more attention to the practical aspects of actual contaminant challenges to 

 those processes. It is necessary to understand how changes in basic vari- 

 ables (e.g., growth, reproduction, and mortality rates) affect populations 

 and communities before laboratory toxicological studies can realistically be 

 related to the contaminant impacts in the environment. A multidisciplinary 

 approach, with close cooperation among Federal, State, and private scientists 

 and resource managers, will be necessary to meet the formidable environmental 

 challenges of the present and the future. 



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