1. Diatom Flora of the Grand River, Ontario, Canada

   • M. R. Sreenivasa
   • H. C. Duthie

   OriginalPaper 01 August 1973 Pages: 161 - 224

2. Field and Experimental Studies on the Effects of a power station effluent on tubificidae (Oligochaeta, Annelida)

   • R. J. Aston

   OriginalPaper 01 August 1973 Pages: 225 - 242

3. The ecology of the diatoms of the klip river, Southern Transvaal

   • Florence D. Hancock

   OriginalPaper 01 August 1973 Pages: 243 - 284

4. Changes in species composition of phytoplankton due to enrichment by N, P, and Si of water from a North Florida Lake

   • Walter A. Glooschenko
   • Carolyn Alvis

   OriginalPaper 01 August 1973 Pages: 285 - 294

5. Population dynamics of pond zooplankton, I. Diaptomus pallidus Herrick

   • Kenneth B. Armitage
   • Bhagwan Saxena
   • Ernest E. Angino

   OriginalPaper 01 August 1973 Pages: 295 - 333

6. Byglandsfjorden. Primary production and other limnological features in an oligotrophic Norwegian lake

   • Arne Lande

   OriginalPaper 01 August 1973 Pages: 335 - 344

7. Réponse des Larves de Perla burmeisteriana Claassen (Plecoptera) aux variations de la pression hydrostatique

   • Ionel Miron

   OriginalPaper 01 August 1973 Pages: 345 - 354

8. Precence of β-Carotene and Xantophylls in two species of the genus Niphargus (Crustacea: Amphipoda)

   • B. Czeczuga
   • A. Skalski

   OriginalPaper 01 August 1973 Pages: 355 - 362

9. Libri novi

   OriginalPaper 01 August 1973 Pages: 363 - 367

10. Announcement

    Announcement 01 August 1973 Pages: 368 - 368