1. Publisher's announcement

   Announcement Pages: vi - vi

2. River Laboratory of the Freshwater Biological Association Twenty-five years of research

   • A. D. Berrie

   OriginalPaper Pages: 1 - 2

3. The chalk-stream environment

   • A. D. Berrie

   OriginalPaper Pages: 3 - 9

4. Spatial and temporal occurrence of invertebrates in a chalk stream, Berkshire, England

   • J. F. Wright

   OriginalPaper Pages: 11 - 30

5. Life history patterns of river invertebrates

   • M. Ladle
   • R. J. Ladle

   OriginalPaper Pages: 31 - 37

6. Biology of epiphytic Chironomidae (Diptera:Nematocera) in chalk streams

   • L. C. V. Pinder

   OriginalPaper Pages: 39 - 51

7. Protozoan communities in chalk streams

   • M. A. Sleigh
   • B. M. Baldock
   • J. H. Baker

   OriginalPaper Pages: 53 - 64

8. The role of leaf litter macroinvertebrates in stream-floodplain dynamics

   • Richard W. Merritt
   • Daniel L. Lawson

   OriginalPaper Pages: 65 - 77

9. Influence of disturbance on insect communities in Pacific Northwest streams

   • N. H. Anderson

   OriginalPaper Pages: 79 - 92