BIOTIC STREAM RESPONSES TO STREAM REAERATION 



35 



Biological Considerations 



It is generally recognized that the living organisms in a polluted stream 

 are intimately concerned with many of the transformations that lead to 



Fig. 2. Sources of pollutants, city of Park Falls. 1 and 2, lumber mills. 

 3, pulp and paper mill. 4, sewage treatment plant. 



