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Pedogeomorphic aspects of the Roodepoort area, Transvaal: Soil depth-slope relationships
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: M.C. Munnik --- Department of Geography, E. Verster --- Department of Geography, T.C. van Rooyen --- Department of Geography,Fifty hillslope profiles with associated soils in the Roodepoort area, Transvaal, were examined to determine the relationships between soil depth and hillslope characteristics. A meso-scale approach was adopted which implied the relationship between three soil depth phases and the hillslope... -
AN ASSESSMENT OF THE POTENTIAL IMPACT OF ALIEN INVASIVE VEGETATION ON THE GEOMORPHOLOGY OF RIVER CHANNELS IN SOUTH AFRICA
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: Kate Rowntree --- Department of Geography, South AfricaInvasion of the riparian zone by alien vegetation is recognised as a serious problem in many areas of South Africa. Vegetation is a dynamic component of river channels. It is an important control variable affecting channel form whereas the flow... -
A GEOMORPHOLOGICAL APPROACH TO THE IDENTIFICATION AND CLASSIFICATION OF INSTREAM FLOW ENVIRONMENTS
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: R.A. Wadeson --- Department of Geography, South AfricaThis paper highlights the considerable confusion that exists within the ecological literature concerning the classification of the lotic (flowing water) environments. A large number of ill defined terms has been introduced by various authors; these often relate to better defined... -
The application of a hydraulic biotope matrix to the assessment of available habitat: Potential application to IFRs and river health monitoring
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: RA Wadeson KM RowntreeIn an attempt to meet the requirement of the new South African Water law a number of initiatives are under way to determine the flow requirements for our rivers. An essential component of this initiative is the determination of the... -
Towards a classification of Tanzanian rivers: a bioassessment and ecological management tool. A case study of the Pangani, Rufiji and Wami–Ruvu river basins
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: LT Kaaya --- Department of Aquatic Sciences and Fisheries, TanzaniaRiver classification is important for reporting ecological status and for the general ecological management of river systems by partitioning natural variability. A priori river classification by abiotic variables and validation of classifications obtained using aquatic macroinvertebrates from reference sites for... -
Bathymetry, substrate and fishing areas of Southeast Atlantic high-seas seamounts
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: OA Bergstad --- Institute of Marine Research (IMR), Norway ÅS Høines --- Institute of Marine Research (IMR), Norway R Sarralde --- Instituto Espanol de Oceanografia, Centro Oceanografico de Canarias, Spain G Campanis --- South East Atlantic Fisheries Organisation (SEAFO), Namibia M Gil --- Departamento de Ecología y Biología Animal, Edificio de Ciencias Experimentales, Spain F Ramil --- Departamento de Ecología y Biología Animal, Edificio de Ciencias Experimentales, Spain E Maletzky --- Ministry of Fisheries and Marine Resources, Namibia E Mostarda --- Food and Agriculture Organization of the United Nations (FAO), Italy L Singh --- Branch: Fisheries Management, Department of Agriculture, Forestry and Fisheries (DAFF), South Africa MA António --- Secretary of State of Affairs, Ministry of Agriculture, Rural Development and Fisheries, AngolaMost of the Southeast Atlantic Ocean is abyssal, and global bathymetries suggest that only ∼3.2% of the areas beyond national jurisdiction (ABNJ; also known as the high seas, as defined in the United Nations Convention on the Law of the... -
Assessment of subsurface riverbed clogging by fine sediments in a semi-arid catchment of north-western Algeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AM Bendaoud --- , Algeria KA Haddou --- , Algeria AM Taleb --- , Algeria NO Belaidi --- , AlgeriaIn semi-arid regions, natural and anthropogenic disturbances increase the input of fine particles and their subsequent accumulation in streambeds sediment. The clogging of streambeds sediment is caused by the infiltration of fine particles at depth, reducing hydraulic conductivity (K) and...