1. Vertical distribution and diel migration of rotifers in a Parana River floodplain lake

   • Susana Jose de Paggi

   OriginalPaper Pages: 87 - 94

2. Combined effect of the insecticide carbaryl and the Chaoborus kairomone on helmet development in Daphnia ambigua

   • Takayuki Hanazato

   OriginalPaper Pages: 95 - 100

3. Chitin production by Ampelisca (Amphipoda) populations from a fine sand community in the Bay of Morlaix (English channel)

   • Marie-Françoise Voss-Foucart
   • Jean-Claude Dauvin
   • Charles Jeuniaux

   OriginalPaper Pages: 101 - 106

4. Marine gastrotrichs from the sand beaches of the northern Gulf of Mexico: species list and distribution

   • M. Antonio Todaro
   • John W. Fleeger
   • William D. Hummon

   OriginalPaper Pages: 107 - 117

5. Keratella mexicana sp. nov., a new planktonic rotifer from Aguascalientes, Mexico

   • L. A. Kutikoval
   • M. Silva-Briano

   OriginalPaper Pages: 119 - 122

6. Groundwater-surface water ecotones at the upstream part of confluences in former river channels

   • Gudrun Bornette
   • Andrew R. G. Large

   OriginalPaper Pages: 123 - 137

7. Population dynamics and food of bleak (Alburnus alburnus L.) in the littoral zone of Lake Balaton, Hungary

   • P. Bíró
   • I. B. Muskó

   OriginalPaper Pages: 139 - 149

8. The freshwater planarian Dugesia sicula Lepori from Sardinia (Platyhelminthes, Tricladida)

   • Maria Pala
   • Rosa Alba Vacca
   • Giacinta Stocchino

   OriginalPaper Pages: 151 - 156

9. Occurrence of Diaphanosoma excisum (Sars) on a sandy beach at Balramgari (Orissa), India

   • Anil Chatterji
   • Z. A. Ansari
   • A. H. Parulekar

   OriginalPaper Pages: 157 - 161