Articles by Keyword: Rivers

Search results for Rivers

We found 19 results for you
  1. DECOMPOSITION IN FRESHWATER ECOSYSTEMS

    DECOMPOSITION IN FRESHWATER ECOSYSTEMS

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    This review examines the sources and composition of organic matter and the decomposition of particulate and dissolved organic matter (POM and DOM) in freshwater ecosystems. The main points to emerge from the review are listed below.
  2. THE DISTRIBUTION AND ECOLOGY OF TWO MULLET SPECIES IN SOME FRESH WATER RIVERS IN THE EASTERN CAPE, SOUTH AFRICA

    THE DISTRIBUTION AND ECOLOGY OF TWO MULLET SPECIES IN SOME FRESH WATER RIVERS IN THE EASTERN CAPE, SOUTH AFRICA

    Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa
    Data on the relative abundance, penetration and breeding biology of the freshwater mullet Mugil cephalus and the flathead mullet Mugil cephalus in the freshwater reaches of some Eastern Cape coastal rivers are described. The differences found between the two species...
  3. Fluvial Sediment Yield to the Natal Coast: A Review

    Fluvial Sediment Yield to the Natal Coast: A Review

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    Sediment yield is the quantitative expression of soil eroded from the hinterland and deposited in the ocean. This paper reviews existing literature available on sediment yields, particularly for the Natal coast, South Africa. Several authors have attempted to quantify the...
  4. SOME OBSERVATIONS ON THE FISH LIFE IN A SEASONAL SAND RIVER

    SOME OBSERVATIONS ON THE FISH LIFE IN A SEASONAL SAND RIVER

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    Five fish species were collected in a seasonal sand river that had migrated upstream more than 150 km from the permanent Limpopo River. The population structure indicated that mainly juveniles had taken part in this colonisation. No fish were collected...
  5. VARIABILITY IN THE INVERTEBRATE FAUNA OF AN INTERMITTENT STREAM OVER THREE CONSECUTIVE MIDSUMMER PERIODS

    VARIABILITY IN THE INVERTEBRATE FAUNA OF AN INTERMITTENT STREAM OVER THREE CONSECUTIVE MIDSUMMER PERIODS

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    Non-perennial rivers in semi-arid regions are exposed to unpredictable and highly variable rainfall and hydrology which can have considerable effects on faunal organisation at different scales. Spatial and temporal dynamics in the aquatic invertebrate fauna of an aseasonal intermittent river...
  6. MANAGEMENT, CONSERVATION AND RESEARCH OF INTERNATIONALLY SHARED WATERCOURSES IN SOUTIIERN AFRICA—NAMIBIAN EXPERIENCE WITH THE OKAVANGO RIVER AND RIVERS OF THE EASTERN CAPRIVI

    MANAGEMENT, CONSERVATION AND RESEARCH OF INTERNATIONALLY SHARED WATERCOURSES IN SOUTIIERN AFRICA—NAMIBIAN EXPERIENCE WITH THE OKAVANGO RIVER AND RIVERS OF THE EASTERN CAPRIVI

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    Although the emphasis of the recent National Rivers Research Initiative (now the Research Programme for the Management of Rivers) in South Africa was on river research in that country, the reality is that in southern Africa many watercourses are shared...
  7. Gill damage, metallothionein gene expression and metal accumulation in <em>Tilapia sparrmanii</em> from selected field sites at Rustenburg and Potchefstroom, South Africa

    Gill damage, metallothionein gene expression and metal accumulation in <em>Tilapia sparrmanii</em> from selected field sites at Rustenburg and Potchefstroom, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Fish were collected from field sites in the mining and agricultural areas of Potchefstroom and Rustenburg, North-West Province, South Africa. Water and sediment samples from each site, together with fish muscle and gills, were analysed by Inductively Coupled Plasma Mass...
  8. The South African Scoring System (SASS) Version 5 Rapid Bioassessment Method for Rivers

    The South African Scoring System (SASS) Version 5 Rapid Bioassessment Method for Rivers

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The assessment of biota in rivers is a widely recognised means of determining the condition or ‘health’ of rivers. Benthic macroinvertebrates, in particular, are recognised as valuable organisms for bioassessments, due largely to their visibility to the naked eye, ease...
  9. Turnover patterns in fish versus macroinvertebrates — implications for conservation planning

    Turnover patterns in fish versus macroinvertebrates — implications for conservation planning

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Spatial patterns in taxonomic richness and turnover for fish and aquatic macroinvertebrates are compared to assess the relative usefulness of each taxonomic group in mapping biodiversity patterns. Fish and aquatic macroinvertebrate species data for sites down the longitudinal axes of...
  10. Relationship between water temperature predictability and aquatic macroinvertebrate assemblages in two South African streams

    Relationship between water temperature predictability and aquatic macroinvertebrate assemblages in two South African streams

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Variable seasonal stream temperatures are a critical factor in maintaining aquatic invertebrate community patterns. We investigated whether the degree of predictability in a stream's water temperature profile provides insights into the structure and functional predictability of macroinvertebrate communities. Quarterly macroinvertebrate...