Articles by Keyword: Global Change

Search results for Global Change

We found 186 results for you
  1. Water policy in southern Africa: A brief synopsis of some of the macro driving forces

    Water policy in southern Africa: A brief synopsis of some of the macro driving forces

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The water sector reforms that are underway in many parts of southern Africa are a manifestation of a global phenomenon. This is rooted in the human response to the undesirable consequences of development, and seeks to introduce the notion of...
  2. Reviewing evidence of marine ecosystem change off South Africa

    Reviewing evidence of marine ecosystem change off South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Recent changes have been observed in South African marine ecosystems. The main pressures on these ecosystems are fishing, climate change, pollution, ocean acidification and mining. The best long-term datasets are for trends in fishing pressures but there are many gaps,...
  3. A century of woody plant encroachment in the dry Kimberley savanna of South Africa

    A century of woody plant encroachment in the dry Kimberley savanna of South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Woody plant encroachment is frequent in dry savannas. Grazing is often considered to be a major cause of encroachment in dry savannas because grasses are removed by livestock, leaving bare areas for trees to colonise in wetter years. Earlier experiments...
  4. Mangrove reforestation: greening or grabbing coastal zones and deltas? Case studies in Senegal<xref ref-type="fn" rid="FN0001"/>

    Mangrove reforestation: greening or grabbing coastal zones and deltas? Case studies in Senegal<xref ref-type="fn" rid="FN0001"/>

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Besides their important contribution to global biodiversity, mangroves provide many services. Nevertheless, due to an increase of human activities and to climate change, in less than 20 years these ecosystems have lost one fifth of their global surface area. In...
  5. Suspended silt and salinity tolerances of the first zoeal stage of the fiddler crab <em>Uca annulipes</em> (Decapoda: Brachyura) and why marine connectivity is essential to the survival of the species

    Suspended silt and salinity tolerances of the first zoeal stage of the fiddler crab <em>Uca annulipes</em> (Decapoda: Brachyura) and why marine connectivity is essential to the survival of the species

    Item type: Journal Article • Journal: African Journal of Marine Science
    Fiddler crabs (Uca spp.) undergo the zoeal stage of development in open-ocean waters, where they experience stable salinity levels, low turbidity and reduced predation. The St Lucia estuarine system has undergone many geomorphological changes, both natural and anthropogenic, and the...
  6. Latitudinal gradients and poleward expansion of mangrove ecosystems in South Africa: 50 years after Macnae’s first assessment

    Latitudinal gradients and poleward expansion of mangrove ecosystems in South Africa: 50 years after Macnae’s first assessment

    Item type: Journal Article • Journal: African Journal of Marine Science
    Mangroves occur in South African estuaries at their poleward distribution limits, extending into temperate habitats. In 1963, William Macnae published the first comprehensive assessment of mangrove swamps in South Africa and made firsthand observations of these mangrove ecosystems. This article...
  7. AIDS communications through social networks: catalyst for behaviour changes in Uganda

    AIDS communications through social networks: catalyst for behaviour changes in Uganda

    Item type: Journal Article • Journal: African Journal of AIDS Research
    Objective: To investigate distinctive communications through social networks which may be associated with population behaviour changes and HIV prevalence declines in Uganda compared to other countries.
  8. 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...
  9. A LIMNOLOGICAL SYNOPSIS OF BHANGAZI SOUTH, A DYSTROPHIC COASTAL LAKE IN THE GREATER ST LUCIA WETLAND PARK (KWAZULU/NATAL), WITH COMMENTS ON ITS CONSERVATION VALUE.

    A LIMNOLOGICAL SYNOPSIS OF BHANGAZI SOUTH, A DYSTROPHIC COASTAL LAKE IN THE GREATER ST LUCIA WETLAND PARK (KWAZULU/NATAL), WITH COMMENTS ON ITS CONSERVATION VALUE.

    Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences
    Base-line limnological and biological data are given for Lake Bhangazi South, a small lake on the coastal plain of Kwazulu-Natal, South Africa. This shallow (Zmax < 6 m), subtropical lake is a warm and seemingly continuously polymictic system, but experiences...
  10. Impacts of non-selective grazing on cover, composition, and productivity of Nama-karoo grassy shrubland

    Impacts of non-selective grazing on cover, composition, and productivity of Nama-karoo grassy shrubland

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    The non-selective rotational grazing system has undergone a long and controversial development. The merits of this grazing system, where relatively large numbers of livestock are herded into numerous small paddocks for short timespans with long rests between grazings, have not...