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20. Abstract. (Continued) 



Carbon assimilation by four species of phytoplankton was significantly 

 reduced by the light attenuating properties of fine silicon dioxide suspensions. 

 Ingestion of radioactively tagged food cells by two species of calanoid cope- 

 pods was significantly reduced during exposure to suspensions of Fuller's 

 earth, fine silicon dioxide, and natural Patuxent River silt. This report 

 provides base-line data for preproject decisionmaking based on concentration 

 effects of different suspended sediments on selected typical estuarine plankton. 



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