VI-242 



rivers and waste discharges, Its spatial distribution, and 

 Its biological significance. 



(3) A study of the factors that control the qualitative and 

 quantitative aspects of phytoplankton blooms In estuarlal 

 and coastal waters should be carried out. 



(4) The effects of additions of nutrients (phosphate, 

 nitrate, silicate) and oxidlzable carbon on the primary 

 productivity and on the resulting organic load In restricted 

 coastal environments should be determined. The relative 

 effects of the Individual nutrients are Important consider- 

 ations. The rates of oxygen exchange between the atmosphere 

 and other sources (e.g., ferric oxide In sediments) and the 

 coastal waters should also be studied. These studies will 

 help predict to what extent re-aeration can compensate for 

 the oxygen demand caused by the Introduction of oxidlzable 

 carbon and nutrients from waste outfalls. Factors such as 

 wind stress, depth, pressure head, density gradient and 

 stability, and surface films such as petroleum should be 

 considered. 



(5) The biochemical mechanisms for concentration of trace 

 components by the biota, the subsequent effect of this con- 

 centration on the organisms Involved, and the transport and 

 and further concentrating of these trace comptnents as they 

 move up the food chain should be determined. 



