Articles by Keyword: Human Impact

Search results for Human Impact

We found 188 results for you
  1. Influence of intensive irrigation and cultivation on selected soil properties: Arid southern Namibia

    Influence of intensive irrigation and cultivation on selected soil properties: Arid southern Namibia

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The effect of long-term (25 years) intensive irrigation on selected soil properties of the Hardap Irrigation Scheme was determined by comparing soil profiles in irrigated and adjacent non-irrigated areas. The major differences detected between five soil pairs were rubification of...
  2. HUMAN ACTIVITIES AND FACTORS AFFECTING THE DISTRIBUTION OF MACROBENTHIC FAUNA IN SALDANHA BAY

    HUMAN ACTIVITIES AND FACTORS AFFECTING THE DISTRIBUTION OF MACROBENTHIC FAUNA IN SALDANHA BAY

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    The most recent trends in the economic development of Saldanha Bay are towards the tourist and mariculture industries, both of which are dependent on a high quality of water. Yet this water quality is now under threat. In this study,...
  3. Gastropod diversity, distribution and abundance in habitats with and without anthropogenic disturbances in Lake Victoria, Kenya

    Gastropod diversity, distribution and abundance in habitats with and without anthropogenic disturbances in Lake Victoria, Kenya

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    We investigated freshwater gastropod diversity, abundance and distribution in habitats with and without anthropogenic disturbance in two localities, Ndere in the Winam Gulf and Mbita Point, Lake Victoria, Kenya, from May 2002 to January 2004. A total of 133 984...
  4. Impact of human activities on the reproduction of Hooded Vultures <em>Necrosyrtes monachus</em> in Burkina Faso

    Impact of human activities on the reproduction of Hooded Vultures <em>Necrosyrtes monachus</em> in Burkina Faso

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    During the last decades, the critically endangered Hooded Vulture Necrosyrtes monachus has strongly declined across its African range. Although direct persecution has been suggested as a major cause of this decline, little is known about the impact of humans on...
  5. Role of Eucalypt Plantations in Timber Supply and Forest Conservation in Sub-Saharan Africa

    Item type: Journal Article • Journal: South African Forestry Journal
    The role of eucalypt plantations in timber supply and forest conservation in Sub-Saharan Africa was investigated. The annual destruction of 11,5 million ha of tropical forest is highlighted, the various causes indicated and the controversy whether fast-growing plantations and woodlots...
  6. Conserving rangeland resources <em>die bewaring van veldhulpbronne</em>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The aims of the paper are to (1) identify the properties of conservation, (2) explain its poor implementation, and (3) propose remedies.
  7. The use of degradation gradients for the assessment and ecological interpretation of range condition

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Multivariate procedures were used to subdivide the southern African climatic climax grasslands of the 700–800‐mm rainfall zone into relatively homogeneous grazing areas. A degradation gradient was constructed for each of these areas. This was done by means of centred PCA...
  8. How can Human Beings Transgress their Biologically Based Views?

    How can Human Beings Transgress their Biologically Based Views?

    Item type: Journal Article • Journal: South African Journal of Philosophy
    Empirical evidence from developmental psychology and anthropology points out that the human mind is predisposed to conceptualize the world in particular, species-specific ways. These cognitive predispositions lead to universal human commonsense views, often referred to as folk theories. Nevertheless, humans...
  9. DETRIMENTAL EFFECTS OF FENTHION (QUELETOX® UL), USED TO CONTROL RED-BILLED QUELEA (<em>QUELEA QUELEA</em>), ON RHEOPHILIC BENTHIC MACROINVERTEBRATES IN THE ORANGE RIVER

    DETRIMENTAL EFFECTS OF FENTHION (QUELETOX® UL), USED TO CONTROL RED-BILLED QUELEA (<em>QUELEA QUELEA</em>), ON RHEOPHILIC BENTHIC MACROINVERTEBRATES IN THE ORANGE RIVER

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    The relative abundance of rheophilic macroinvertebrates in the Orange River was assessed before and 15 hrs after two aerial applications of fenthion (QUELETOX® UL) above roosting sites of the red-billed quelea (Quelea quelea). The first treatment had no detectable effect...
  10. What does the new century offer range science in southern Africa?

    What does the new century offer range science in southern Africa?

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Range Science, as a developing discipline in southern Africa, is reviewed over its 60 years of formal existence. The context of the African political and socia-economic environment is used as a background to examine the impact that range science has...