Articles by Keyword: Ecology

Search results for Ecology

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  1. A national range inventory for the Kingdom of Lesotho ‘n nasionale opname van die weivelde van die koningkryk van Lesotho

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    With the need for an understanding of the nation's rangelands, the Division of Range Management of the Kingdom of Lesotho has undertaken a national range inventory. This resource study has utilized as aids in this task, the up‐to‐date techniques of...
  2. The rate of consumption of bush and grass by goats in a representative <em>acacia karroo</em> savanna community in the Eastern Cape

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Consumption of browse and grass in a representative Acacia karroo savanna community was measured. Acacia karroo was preferred to grass. It was selected almost exclusively when available at high leaf densities. Grass was consumed in significant amounts only when approximately...
  3. The relative abundance of maize stem borers and their parasitoids at the Tshiombo irrigation scheme in Venda, South Africa

    The relative abundance of maize stem borers and their parasitoids at the Tshiombo irrigation scheme in Venda, South Africa

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Maize is an important resource in many small-scale farming areas in South Africa and especially on irrigation schemes in the Limpopo Province where this crop is cultivated under irrigation in sub-tropical conditions. The aim of this study was to determine...
  4. Reproduction and recruitment patterns of the surf clam <em>Donax serra</em> (Bivalvia, Donacidae) on two Namibian sandy beaches

    Reproduction and recruitment patterns of the surf clam <em>Donax serra</em> (Bivalvia, Donacidae) on two Namibian sandy beaches

    Item type: Journal Article • Journal: South African Journal of Marine Science
    Reproduction and recruitment of the surf clam Donax serra on two Namibian beaches were studied over a period of two years. Histological examination of the gonads indicated a discontinous annual reproductive cycle, related to monthly mean sea surface temperature. The...
  5. OBSERVATIONS ON THE THREE ALLOPATRIC POPULATIONS OF THE MALUTI MINNOW, <underline>OREODAIMON QUATHLAMBAE</underline> (BARNARD) WITH NOTES ON ITS EVOLUTION, ECOLOGY, SPAWNING, AND CONSERVATION

    OBSERVATIONS ON THE THREE ALLOPATRIC POPULATIONS OF THE MALUTI MINNOW, <underline>OREODAIMON QUATHLAMBAE</underline> (BARNARD) WITH NOTES ON ITS EVOLUTION, ECOLOGY, SPAWNING, AND CONSERVATION

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Meristics and pigmentation of specimens of Oreodaimon quathlambae from the three known populations were compared to determine whether the species has experienced divergent evolution. Pigmentation was found to vary substantially but meristics counts did not. A proposal is made-to recognise...
  6. EFFECT OF CATTLE DIP CONTAINING TOXAPHENE ON THE FAUNA OF A SOUTH AFRICAN RIVER

    EFFECT OF CATTLE DIP CONTAINING TOXAPHENE ON THE FAUNA OF A SOUTH AFRICAN RIVER

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    In August 1978 the Hluhluwe River, which runs through the Hluhluwe Game Reserve (Natal, South Africa), was polluted by toxaphene from a cattle dip tank. Faunal surveys were conducted to determine the impact of the insecticide on the fish and...
  7. POPULATION DYNAMICS AND DEMOGRAPHY OF AN ESTUARINE COPEPOD (<em>PSEUDODIAPTOMUS EESSEI</em>) IN LAKE SIBAYA, A SUBTROPICAL FRESHWATER COASTAL LAKE

    POPULATION DYNAMICS AND DEMOGRAPHY OF AN ESTUARINE COPEPOD (<em>PSEUDODIAPTOMUS EESSEI</em>) IN LAKE SIBAYA, A SUBTROPICAL FRESHWATER COASTAL LAKE

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Population size and stage structure of Pseudodiaptomus hessei (Mrázek) was studied over 27 months at a single site in subtropical Lake Sibaya. Population density varied seasonally from about 1 to 4 individuals per litre, but a fairly stable population structure...
  8. A PRELIMINARY STUDY OF ASPECTS OF THE ECOLOGY OF A RARE MINNOW <em>BARBUS TREURENSIS</em> GROENEWALD, 1958 (PISCES: CYPRINIDAE) FROM THE EASTERN TRANSVAAL, SOUTH AFRICA

    A PRELIMINARY STUDY OF ASPECTS OF THE ECOLOGY OF A RARE MINNOW <em>BARBUS TREURENSIS</em> GROENEWALD, 1958 (PISCES: CYPRINIDAE) FROM THE EASTERN TRANSVAAL, SOUTH AFRICA

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    The habitat preferences, food habits, reproduction, age and population size of Barbus treurensis were investigated as part of a survey of the threatened fish of the Transvaal. Barbus treurensis occurs only in an isolated section of the Blyde River tributary...
  9. THE DEVELOPMENT OF ECOLOGICAL CONCEPTS IN LIMNOLOGY, WITH PARTICULAR REFERENCE TO THE LAST TWENTY-FIVE YEARS

    THE DEVELOPMENT OF ECOLOGICAL CONCEPTS IN LIMNOLOGY, WITH PARTICULAR REFERENCE TO THE LAST TWENTY-FIVE YEARS

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    This paper compares the development of ecological ideas in limnological science with those refined in terrestrial biology. It is suggested that topics peculiar to the perception and management of aquatic systems had a distracting influence upon the conceptual development of...
  10. ASPECTS OF THE ECOLOGY OF <em>KNERIA AURICULATA</em> (PELLEGRIN, 1905) (PISCES: KNERIIDAE) FROM THE EASTERN TRANSVAAL SOUTH AFRICA

    ASPECTS OF THE ECOLOGY OF <em>KNERIA AURICULATA</em> (PELLEGRIN, 1905) (PISCES: KNERIIDAE) FROM THE EASTERN TRANSVAAL SOUTH AFRICA

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Seven natural populations of Kneria auriculata occur in tributaries of the Crocodile River (Incomati System) on the eastern Transvaal escarpment. The routes it probably used to colonize these streams are discussed and used to explain its current restricted distribution with...