1. Kees Bakker: Hydrobiologist

   • Piet H. Nienhuis
   • Rob H. D. Lambeck

   Announcement Pages: 4 - 8

2. Size distributions and trophic relationship of the pelagic ecosystem in the Oosterschelde (S.W. Netherlands)

   • M. L. M. Tackx
   • J. W. Francke
   • J. Rijk

   OriginalPaper Pages: 9 - 14

3. Field observations in the Oosterschelde (The Netherlands) onCoscinodiscus concinnus andCoscinodiscus granii (Bacillariophyceae) infected by the marine fungusLagenisma coscinodisci (Oomycetes)

   • L. P. M. J. Wetsteyn
   • L. Peperzak

   OriginalPaper Pages: 15 - 21

4. Nutrient-induced competition between two species of marine diatoms

   • Niels de Pauw
   • Eddy Naessens-Foucquaert

   OriginalPaper Pages: 23 - 27

5. Phytoplankton primary production, chlorophyll and species composition, organic carbon and turbidity in the Marsdiep in 1990, compared with foregoing years

   • Gerhard C. Cadée
   • Jan Hegeman

   OriginalPaper Pages: 29 - 35

6. Phytoplankton composition and spatial distribution of copper and zinc in the Fal Estuary (Cornwall, UK)

   • J. W. Rijstenbil
   • A. G. A. Merks
   • J. A. Wijnholds

   OriginalPaper Pages: 37 - 43

7. Some reflections on the structure of the mandibleplate ofEurytemora affinis (Copepoda, Calanoida)

   • Revis N.
   • J. Castel
   • M. L. M. Tackx

   OriginalPaper Pages: 45 - 50

8. The spring-time abundance and feeding ofEurytemora affinis (Poppe) in Volkerak-Zoommeer, a newly-created freshwater lake system in the Rhine delta (The Netherlands)

   • Ramesh D. Gulati
   • Anja Doornekamp

   OriginalPaper Pages: 51 - 60

9. Daily egg production ofTemora longicornis (Copepoda, Calanoida) during winter and early spring in the Marsdiep (Southern North Sea)

   • H. G. Fransz
   • S. R. Gonzalez

   OriginalPaper Pages: 61 - 64

10. Degradation of diatom chlorophyll to colourless, non-fluorescing compounds during copepoo grazing

    • W. W. C. Gieskes
    • M. M. Engelkes
    • G. W. Grakaay

    OriginalPaper Pages: 65 - 72

11. Recycling of food byDaphnia magna Straus (Cladocera): A possible role in swarming

    • Kees Kersting

    OriginalPaper Pages: 73 - 75

12. Diel vertical migration ofEudiaptomus gracilis during a short summer period

    • J. Ringelberg
    • B. J. G. Flik
    • K. Royackers

    OriginalPaper Pages: 77 - 84

13. Variability and possible adaptive significance of day-time vertical distribution ofLeptodora kindtii (Focke) (Cladocera) in a shallow eutrophic lake

    • J. Vijverberg

    OriginalPaper Pages: 85 - 91

14. Selective ingestion of phytoplankton by the bivalvesMytilus edulis L. andCerastoderma edule (L.)

    • T. C. Prins
    • A. C. Smaal
    • A. J. Pouwer

    OriginalPaper Pages: 93 - 100