1. Decomposition and nutrient liberation rates of plant material in the Parana medio River (Argentina)

   • M. Leguizamon
   • J. Hammerly
   • M. J. Pizarro

   OriginalPaper Pages: 157 - 164

2. Six new species of the genus Diplopeltula (Nematoda: Diplopeltidae) with remarks on the heterogeneity of the taxon

   • M. Vincx
   • N. Gourbault

   OriginalPaper Pages: 165 - 178

3. The physiological state of the phytoplankton community of three types of lakes as estimated by its adenylate energy charge

   • Shuji Hino

   OriginalPaper Pages: 179 - 192

4. Nutrient loading and drainage channel response in a ricefield system

   • Elisenda Forès

   OriginalPaper Pages: 193 - 200

5. Effects of liming on the occurrence and abundance of fish populations in acidified Swedish lakes

   • E. Degerman
   • M. Appelberg
   • P. Nyberg

   OriginalPaper Pages: 201 - 212

6. A method for the study of N₂O evolution in tropical wetlands

   • Valeria Whitaker
   • Bohdan Matvienko

   OriginalPaper Pages: 213 - 218

7. The body wall of Halicryptus spinulosus (Priapulida) — ultrastructure and changes induced by hydrogen sulfide

   • Hans Heinrich Janssen
   • Rolf Oeschger

   OriginalPaper Pages: 219 - 230

8. Volume 230 (1992), Contents

   Legacy Pages: i - i

9. Volume 230 (1992), Author index

   Legacy Pages: ii - ii