Author:Chutter, FMDate:1962In the course of an ecological survey of the macro-invertebrate fauna of the stream and rivers in the catchment of the Vaal Dam the author found a new species of Pseudagrion which is described here. The author’s colleagues, engaged in similar ...Read more
Author:Welsh, HDate:1963The author is indebted to Dr. A.D Harrison of the Department of Zoology, University of Rhodesia and Nyasaland, Salibury, for sending him some algal material collected on the 25th of April 1962, in a granophyre rock pool high above the Lundi ...Read more
Author:Shillinglaw, SN; Pieterse, AJHDate:1977A dense algal population is of primary importance in sewage maturation ponds for the removal of plant nutrients, especially ammonia and orthophosphate. In the Republic of South Africa and in South West Africa sudden algal population declines ...Read more
Author:Scott, WEDate:15 Nov 1979As a result of potential toxin production the blue-green alga microcystis aeruginosa is a serious problem in eutrophic impoundments in South Africa. This study reports on growth characteristics of M. aeruginosa in the laboratory and is ...Read more
Author:Chutter, FMDate:Dec 1968There is a large population of Simulium chutteri lewis in the Vaal river at and below the village of Warrenton in the north-east of the Cape Province, South Africa. The female of this species attacks man, cattle and horses and had become a ...Read more
Author:Gibberd, M-J; Kean, E; Barlow, R; Thomalla, Sandy J; Lucas, MDate:Aug 2013A chemotaxonomic investigation of surface phytoplankton was undertaken on a research cruise to the Atlantic sector of the Southern Ocean during late austral summer 2009. Based on pigment signatures, several distinct regions emerged that were ...Read more
Author:Chutter, FM; Noble, RGDate:May 1966In field ecological studies inferences must often be drawn from dissimilarities in numbers and species of organisms found in biological samples collected at different times and under various conditions.Read more
Author:Duuren, FRDate:1967Waters differ greatly in physical and chemical quality and in content of microorganisms. The quality of the water is clearly related to the contents and types of organisms present and both of this aspect is the object of intensive study at present.Read more
Author:Van Deventer, Martha JDate:Jul 2009Council for Scientific and Industrial Research’s digital preservation strategy and future plans for digital preservation effort are outlined. Guidelines and best practices for digitisation are already available, but the digitisation project ...Read more
Author:Archibald, REMDate:1966In January, 1966, the Zoology Department of Rhodes University, Grahamstown, undertook a second expedition to Lake Sibayi under the leadership of Professor B. R Allanson. Lake Sibayi is a lake situated in the central littoral section of Tongaland ...Read more
Author:Archibald, REMDate:1966In studies of the ecology of diatoms, particularly in the case of studies concerned in any way with organic pollution, one of the most important genera of diatoms concerned is the genus Nitzschia Hassall.Read more
Author:Van der Molen, JDate:Jan 2008Diatoms are an important group of micro algae occurring in marine, estuarine and freshwater habitats as phytoplankton and phytobenthos. The species composition at any given time and place is indicative of the prevailing environmental conditions ...Read more
Author:Van der Molen, JDate:Jul 2008Diatoms are an important group of micro algae occurring in marine, estuarine and freshwater habitats as phytoplankton and phytobenthos. The species composition at any given time and place is indicative of the prevailing environmental conditions ...Read more
Author:Nupen, EMDate:Jun 1974This paper attempts to assess the present and future needs for such waters and the virus risk involved in their usage.Read more