Multiple addition bioassay of Tjeukemeer water H. de HaanJ. B. W. WandersJ. R. Moed OriginalPaper Pages: 233 - 244
The influence of phytoplankton composition on the relative effectiveness of grinding and sonification for chlorophyll extraction W. Y. B. ChangR. Rossmann OriginalPaper Pages: 245 - 249
Ecology of streams draining forested and non-forested catchments in an area of central Scotland subject to acid precipitation R. HarrimanB. R. S. Morrison OriginalPaper Pages: 251 - 263
The effect of temperature, darkness, starvation and various food types on growth, survival and reproduction of Helisoma duryi, Biomphalaria alexandrina and Bulinus truncatus (Gastropoda: Planorbidae) M. A. El-EmamH. Madsen OriginalPaper Pages: 265 - 275
Manganese-54 accumulation by Chlorella spp., Daphnia magna and yellow perch (Perca flavescens) Paul K. KearnsRichard J. Vetter OriginalPaper Pages: 277 - 280
The breakdown and decomposition of allochthonous and autochthonous plant litter in an oligotrophic lake (Llyn Frongoch) R. David G. Hanlon OriginalPaper Pages: 281 - 288
Utilisation de la technique d'électrophorèse dans la systématique des poissons J. FranssenG. Nibaruta OriginalPaper Pages: 289 - 293
Decrease in stream gravel permeability after clear-cut logging: an indication of intragravel conditions for developing salmonid eggs and alevins J. R. Moring OriginalPaper Pages: 295 - 298
Structure and dynamics of zooplankton communities in the littoral zone of some North Carolina lakes A. D. LemlyJ. F. Dimmick OriginalPaper Pages: 299 - 307
Effets de la température sur la croissance de deux algues vertes du fleuve St-Laurent, secteur de Gentilly, Québec Y. ThibaultR. Couture OriginalPaper Pages: 309 - 318
Garra tibanica ghorensis subsp.nov. (Pisces: Cyprinidae), an African element in the cyprinid fauna of the Levant F. Krupp OriginalPaper Pages: 319 - 324