Si02<l5/im 



Fuller's Earth 



Patuxent Silt 



100 



500 1,000 



Concentration (mg/l ) 



5,000 10,000 



Figure 12. Reduction in maximum ingestion rate of adult Aaartia 

 tonsa feeding on radiocarbon- labeled Monochrysis 

 lutheri at increasing concentrations of Patuxent River 

 silt, <15 micrometers Si02, and Fuller's earth. 



29 



