Articles by Keyword: Vegetation Dynamics

Search results for Vegetation Dynamics

We found 109 results for you
  1. 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...
  2. Perspective article: Simulation models for semi‐arid rangelands of southern Africa

    Perspective article: Simulation models for semi‐arid rangelands of southern Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    In semi‐arid regions, the effects of grazing or sparing management on natural communities of long‐lived plants generally take decades to become evident. Event‐driven dynamic behaviour, unpredictable and low rainfall, and complicated interactions between species make it difficult to gather sufficient...
  3. The impact of indigenous ungulate herbivory over five years (2004–2008) on the vegetation of the Little Karoo, South Africa

    The impact of indigenous ungulate herbivory over five years (2004–2008) on the vegetation of the Little Karoo, South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    This study investigated the impact of rainfall and herbivory by indigenous herbivores over five years (2004–2008) on the vegetation of the Sanbona Wildlife Reserve (SWR), a 54 000 ha privately owned conservation area in the Little Karoo. Changes in floristic...
  4. Temporal and spatial variability in the abundance, biomass and distribution of <em>Palaemon peringueyi</em> (Decapoda: Crustacea) are influenced by biological but not physico-chemical factors in the permanently open Kariega Estuary, South Africa

    Temporal and spatial variability in the abundance, biomass and distribution of <em>Palaemon peringueyi</em> (Decapoda: Crustacea) are influenced by biological but not physico-chemical factors in the permanently open Kariega Estuary, South Africa

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    Biological and physico-chemical factors affecting abundance and biomass of shrimp Palaemon peringueyi were investigated in 2010–2011 in the lower, middle and upper reaches of the freshwater-deprived permanently open Kariega Estuary. Shrimp abundance and biomass ranged from 0 to 88 ind...
  5. Impact of marine inundation after a period of drought on the lakeshore vegetation of Lake St Lucia, South Africa: resilience of estuarine vegetation

    Impact of marine inundation after a period of drought on the lakeshore vegetation of Lake St Lucia, South Africa: resilience of estuarine vegetation

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The shore of Lake St Lucia in the vicinity of Catalina Bay, in the southern part of the lake, receives freshwater input as surface and groundwater seepage from the adjacent elevated coastal plain. Vegetation, water quality and landform were recorded...
  6. Effects of smoke, ash and heat shock on seed germination of seven species from Central Zagros rangelands in the semi-arid region of Iran

    Effects of smoke, ash and heat shock on seed germination of seven species from Central Zagros rangelands in the semi-arid region of Iran

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Fire products have been widely identified as germination cues for a number of species from both fire-prone and fire-free ecosystems. However, there is uncertainty about the effects of fire products on seed germination of semi-arid rangeland species. We examined the...
  7. Long-term livestock grazing increases the recruitment success of epigeal termites: insights from a &gt;75-year grazing experiment in the Karoo, South Africa

    Long-term livestock grazing increases the recruitment success of epigeal termites: insights from a &gt;75-year grazing experiment in the Karoo, South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Epigeal termites alter ecosystem-level processes through foraging and mound building. These effects are proportional to density. Whilst much is known about the factors influencing mound density in natural settings, how termites respond to livestock grazing has been overlooked. We compared...
  8. The dynamics of <em>Themeda Triandra</em> tillers in relation to burning in the natal Drakensberg

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Marked tillers of Themeda triandra were sampled regularly over a two year period in Highland Sourveld burnt annually in winter, biennially in spring and after a single summer and early winter burning treatment. Parameters recorded were height of shoot apex,...
  9. A gradient analysis of grassed mountain catchments in the natal Drakensberg

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    An indirect gradient analysis was carried out on vegetation and environmental data from the Mdedelelo Wilderness Area of Cathedral Peak State Forest in Highland Sourveld. Vegetation ordination axes were correlated with environmental variables deduced to have influenced species‐composition. Altitude proved...
  10. Towards visual assessment of succulent valley bushveld

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Visual vegetation assessment was tested for repeatability and accuracy and compared with an objective survey technique for time and cost efficiency. Eighteen operators first inspected a range of sites where ecological status was known. Using these for reference, they then...