FIGURES 



Section Page 



Major steps and some sources of input for a research 

 approach to assessing contaminant threats to fish 

 and wildlife resources 3 



Laboratory evaluation of chronic effects of contaminants 

 on fish in a flow through diluter system 7 



A comprehensive analytical schematic for the separation 



and analysis of organic contaminants 8 



Locations of CNFRL field stations and their associated 

 watershed areas of concern 10 



Storm tracks which indicate where acids and metals are 

 deposited by precipitation in poorly buffered lakes 

 and streams of New England 12 



One of many coal -fired power plants under construction in 

 the Northern Great Plains of the U.S 13 



Researchers collecting water containing waste oil from a 

 drilling operation in Wyoming 15 



Extensive clearing of irreplaceable bottomland hardwood 

 forests 16 



2 Main functional groups in aquatic ecosystem 23 



2 Surmiarized graphs of the main links in self-purifica- 

 tion 25 



2 Relationship between degree of purification, pollution, 

 number of species and disturbance of aquatic eco- 

 system 28 



2 Degradation of aquatic communities 30 



4 Computerized treatment of residue data from fathead 



minnows exposed to 3.7 ng/1 of Kepone 53 



IX 



