1. Assumed Amphi-Atlantic distribution of Oxyurella tenuicaudis (Cladocera, Chydoridae) denied by a new species from North America

   • R. George Michael
   • David G. Frey

   OriginalPaper Pages: 3 - 35

2. The destruction of aquatic vegetation by carp

   • Alain J. Crivelli

   OriginalPaper Pages: 37 - 41

3. Limnological effects of peatland drainage and fertilization as reflected in the varved sediment of a deep lake

   • Heikki Simola

   OriginalPaper Pages: 43 - 57

4. Studies on predation of the mosquito Culex fatigans by Rana tigrina tadpoles

   • M. Peter Marian
   • M. S. M. Christopher
   • T. J. Pandian

   OriginalPaper Pages: 59 - 63

5. Chronic toxicity of three insecticides (carbaryl, fenthion and lindane) in the freshwater snail Lymnaea stagnalis

   • Jacqueline Seugé
   • Roger Bluzat

   OriginalPaper Pages: 65 - 72

6. New records of Adelodrilus (Oligochaeta, Tubificidae), with descriptions of two new species from the North-west Atlantic

   • Christer Erséus

   OriginalPaper Pages: 73 - 83

7. Book reviews

   BookReview Pages: 85 - 87