1. Colorimetric determination of sulphate in freshwater with a chromate reagent

   • H. L. Golterman
   • I. M. De Graaf Bierbrauwer-Würtz

   OriginalPaper Pages: 111 - 115

2. Modification of an index of biotic integrity based on fish assemblages to characterize rivers of the Seine Basin, France

   • T. Oberdorff
   • R. M. Hughes

   OriginalPaper Pages: 117 - 130

3. Diversity, distribution, and seasonal abundance of Ephemeroptera in streams of Meghalaya State, India

   • Abhik Gupta
   • R. George Michael

   OriginalPaper Pages: 131 - 139

4. Phytoplankton and physical-chemical features of Tavropos Reservoir, Greece

   • M. Moustaka-Gouni
   • G. Nikolaidis

   OriginalPaper Pages: 141 - 149

5. Direct observation of toxic effects of cyanobacterial extracellular products on Daphnia

   • Donal J. Forsyth
   • James F. Haney
   • Mark R. James

   OriginalPaper Pages: 151 - 155

6. Feeding patterns of four macroinvertebrate taxa in the headwaters of the Buffalo River, eastern Cape

   • Carolyn G. Palmer
   • Jay H. O'Keeffe

   OriginalPaper Pages: 157 - 173