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Ordination of land types in the karoo region into reasonably homogeneous farming areas based on vegetation and environmental factors1
Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa • Authors: M. Vorster --- Department of Agriculture and Water Supply (Karoo Region), H.R. Becker --- Department of Agriculture and Water Supply (Karoo Region), J.S. Greyling --- Department of Agriculture and Water Supply (Karoo Region), O.J.H. Bosch --- Department of Botany,The 291 preliminary land types in the Karoo Region formed the basis for the demarcation of the 144 Reasonably Homogeneous Farming Areas (RHFAs). The land types were firstly reduced to 23 Floristic Climatic Regions (FCRs) according to character species for... -
NUTRIENT CYCLING IN MARINE ECOSYSTEMS
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P. Chapman --- , South AfricaThe overall cycles of nitrogen, phosphorus and silicon in the sea are described and compared. Data on the fluxes and rates of change between various pools of each nutrient are given, where available, and gaps in knowledge are pointed out... -
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... -
Comparative assessment of construction cost overruns: A case study of regional distribution in Ghana
Item type: Journal Article • Journal: African Journal of Science, Technology, Innovation and Development • Authors: George Harrison Coffie --- Faculty of Engineering and the Built Environment, Department of Construction Management and Quantity Surveying, University of Johannesburg, 37 Nind Street, Doornfontein, Johannesburg, 2094, South Africa Clinton Ohis Aigbavboa --- Faculty of Engineering and the Built Environment, Department of Construction Management and Quantity Surveying, University of Johannesburg, 37 Nind Street, Doornfontein, Johannesburg, 2094, South AfricaThis study examines the magnitude of variance between the initial contract award cost and actual completion cost of building construction projects (educational related) from Ghana that were completed between 2011 and 2016. The findings brought differences in the actual completion... -
Zoogeography of marine Bryozoa around South Africa
Item type: Journal Article • Journal: African Journal of Marine Science • Authors: MK Boonzaaier-Davids --- , South Africa WK Florence --- , South Africa MJ Gibbons --- , South AfricaThe zoogeography of marine Bryozoa around South Africa was investigated using published distribution records, museum catalogues, and an examination of previously unworked bryozoan material in (mostly) museum collections. Although a total of 276 valid species are recognised, it was not... -
Links between introduced fish and zooplanktonic and zoobenthic food sources in the food webs of two reservoirs of a semi-arid zone in Algeria
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: M Djezzar --- , Algeria JM Mortillaro --- , Madagascar SE Doumandji --- , Algeria T Meziane --- , FranceFew studies have focused on the trophic functioning of the reservoirs in Algeria. The study of the gut contents of fish species, as well as the analysis of the stable isotopes of 13C and 15N in the environment, were carried...