1. ³²P uptake in three submerged aquatic plant species

   • Sasadhar Jana
   • Monojit A. Choudhuri

   OriginalPaper Pages: 97 - 101

2. Food selection and consumption by estuarine nematodes

   • K. Romeyn
   • L. A. Bouwman

   OriginalPaper Pages: 103 - 109

3. Age structure of the populations ofPisidium species from two localities in southern Poland

   • Anna Dyduch-Falniowska

   OriginalPaper Pages: 111 - 117

4. Ecological and morphological observations onHydrobius niger (Zschach, 1788) andHydrobius fuscipes (Linnaeus, 1758) (Coleoptera, Hydrophilidae)

   • Th. G. Giesen

   OriginalPaper Pages: 119 - 127

5. Fish impingement at power stations situated along the rivers Rhine and Meuse in The Netherlands

   • R. H. Hadderingh
   • G. H. F. M. van Aerssen
   • J. W. Van Der Stoep

   OriginalPaper Pages: 129 - 141

6. Phosphorus removal in a sewage treatment plant and plant biomass in an effluent receiving lowland stream

   • F. A. Kouwe

   OriginalPaper Pages: 143 - 156

7. Problems of ecologists as experts in environmental decision-making in The Netherlands

   • Jacqueline Cramer

   OriginalPaper Pages: 157 - 167

8. Studies of the ecophysiology of algae in the laboratory of microbiology of the University of Amsterdam (summaries)

   Abstract Pages: 169 - 178

9. Congresses

   • Hydrobiological Society
   • J. Coosen

   Announcement Pages: 179 - 179

10. Publications

    • J. H. Stock
    • Jaap Dorgelo

    BookReview Pages: 179 - 181