Population dynamics of Ischnura E. elegans (Vander Linden) (Insecta: Odonata) with special reference to morphological colour changes, female polymorphism, multiannual cycles and their influence on behaviour B. O. N. Hinnekint OriginalPaper Pages: 3 - 31
Seasonal variation in marine phytoplankton and ice algae at a shallow antarctic coastal site R. A. PerrinP. LuH. J. Marchant OriginalPaper Pages: 33 - 46
The possibility of predator avoidance by Lake Michigan zooplankton Peter C. SchulzeArthur S. Brooks OriginalPaper Pages: 47 - 55
Feeding ecology of Oreochromis niloticus (Linnaeus) & Tilapia Zillii (Gervias) in a Nile canal Elsayed A. KhallafA. A. Alne-na-ei OriginalPaper Pages: 57 - 62
Sensitivity of Asellus aquaticus (L.) and Proasellus coxalis Dollf. (Crustacea, Isopoda) to Copper Marina de Nicola GiudiciLuciana MiglioreSandro Maria Guarino OriginalPaper Pages: 63 - 69
Ecology of Potamanthus myops (Walsh) (Ephemeroptera: Potamanthidae) in a Michigan stream (USA) Mark D. MunnRobert H. King OriginalPaper Pages: 71 - 75
Distribution of freshwater snails in the river Niger basin in Mali with special reference to the intermediate hosts of schistosomes Henry MadsenGodefroy CoulibalyPeter Furu OriginalPaper Pages: 77 - 88
The biomass and yield of the dominant fish species in Hartbeespoort Dam, South Africa K. L. Cochrane OriginalPaper Pages: 89 - 96