XVIII 



CONTENTS 



Fossil- Fuel Stresses 



Environmental Implications of Coal-Conversion 

 Technologies: Organic Contaminants 157 



C. W. Gehrs'' 

 The Stream Environment and Macro invertebrate 

 Communities: Contrasting Effects of Mining in 

 Colorado and the Eastern United States .... 176 



J. V. Ward, S. P. Canton, and L. J. Gray 

 Meiofaunal Abundance in Sandbars of Acid 

 Mine Polluted, Reclaimed, and Unpolluted 

 Streams in Southeastern Ohio 188 



W. D. Hummon, W. A. Evans, M. R. Hummon, 



F. G. Doherty, R. H. Wainberg, and 



W. S. Stanley 

 Cytotoxicity of Untreated Coal-Conversion 

 Gasifier Condensate 204 



T. W. Schultz, J. N. Dumont, and 



L. M. Kyte 

 Aquatic Toxicology of Trace Elements of Coal 

 and Fly Ash 219 



W. J. Birge 



Heavy-Metal Stresses 



Mercury Contamination Standards for Marine 

 Environments 241 



R. Eisler* 

 A Radioisotopic Study of Mercury Uptake 

 by Hudson River Biota 273 



L. S. Zubarik and J. M. O'Connor 

 Impact of Arsenicals on Nitrification in 

 Aqueous Systems 290 



H. W. Holm and M. F. Cox 

 Copper Sensitivity of Adult Pacific 

 Oysters 301 



F. L. Harrison and D. W. Rice, Jr. 

 An In Situ Study of Cadmium Stress in a 

 Natural Zooplankton Community 316 



J. S. Marshall and D. L. Mellinger 



*Invited speaker. 



