Articles by Keyword: Exclosure Experiment

Search results for Exclosure Experiment

We found 11 results for you
  1. Impact of shorebird predation on intertidal macroinvertebrates in a key North African Atlantic wintering site: an experimental approach

    Impact of shorebird predation on intertidal macroinvertebrates in a key North African Atlantic wintering site: an experimental approach

    Item type: Journal Article • Journal: African Journal of Marine Science
    Shorebirds, as migratory aquatic birds and top predators in intertidal ecosystems, can be affected by global environmental changes and escalations in local impacts on coastal lagoons and estuarine trophic networks. Many shorebirds winter in North African Atlantic coastal sites, most...
  2. A comparison of the utilization of initially-applied labelled ammonium and nitrate nitrogen by wheat grown in a pot experiment

    A comparison of the utilization of initially-applied labelled ammonium and nitrate nitrogen by wheat grown in a pot experiment

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    The utilization of initially-applied 15N-labelled ammonium and nitrate nitrogen by wheat plants grown in soil was investigated in a pot experiment under controlled growth chamber conditions. The application rate was approximately 140 kg N ha−1) and the treatments consisted of...
  3. Growth modelling of <em>Pinus roxburghii</em> in South Africa

    Growth modelling of <em>Pinus roxburghii</em> in South Africa

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    The growth in diameter at breast height, height and tree volume and plot density were studied in an unreplicated spacing trial of Pinus roxburghii at Weza, South Africa.
  4. The effect of prolonged heavy grazing pressure on the regrowth of two perennial grass species in a semi-arid communal rangeland

    The effect of prolonged heavy grazing pressure on the regrowth of two perennial grass species in a semi-arid communal rangeland

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    We tested the hypothesis that initial above-ground regrowth of defoliated grass tufts would be reduced in sites which have been exposed to prolonged heavy grazing. The regrowth of Themeda triandra and Urochloa mosambicensis tufts was compared between three heavily grazed...
  5. Tebuthiuron residues remain active in soil for at least eight years in a semi-arid grassland, South Africa

    Tebuthiuron residues remain active in soil for at least eight years in a semi-arid grassland, South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    The non-selective, soil-applied herbicide tebuthiuron (1-(5-tert-butyl-1,3,4-thiadiazol-2-yl)-1,3-dimethylurea) is registered for the control of the indigenous encroacher shrub Seriphium plumosum (Asteraceae) in South Africa. The use of tebuthiuron on a farm in the Cymbopogon–Themeda veld type in the Zastron district of the...
  6. Interactions between fish and snails in a Zimbabwe pond, with particular reference to <em>Sargochromis codringtonii</em> (Pisces: Cichlidae)

    Interactions between fish and snails in a Zimbabwe pond, with particular reference to <em>Sargochromis codringtonii</em> (Pisces: Cichlidae)

    Item type: Journal Article • Journal: African Journal of Aquatic Science
    The impact of fishes on snail densities in a 100 x 12m pond was assessed from October 2000 to May 2002, using a fish exclosure experiment. Snail species included numerically dominant Bulinus globosus (ca 85%) as well as B. tropicus,...
  7. Protocol and beyond: practices of care during a Tuberculosis vaccine clinical trial in South Africa

    Protocol and beyond: practices of care during a Tuberculosis vaccine clinical trial in South Africa

    Item type: Journal Article • Journal: Anthropology Southern Africa
    Much of the current social science literature on the clinical trials industry focuses on the profit-seeking practices adopted by pharmaceutical companies and the contract research organisations they employ to enable the mass production and distribution of their products. However, what...
  8. No evidence for avoidance of black rat scent by the presumably less competitive Natal multimammate mouse in a choice experiment

    No evidence for avoidance of black rat scent by the presumably less competitive Natal multimammate mouse in a choice experiment

    Item type: Journal Article • Journal: African Zoology
    In Africa, indigenous multimammate mice (Mastomys natalensis) only appear to live commensally in houses when invasive black rats (Rattus rattus) are absent, yet little is known about the underlying mechanism. Avoidance through smell may cause the absence of M. natalensis...
  9. Effects of waterlogging, salinity and light on the productivity of <em>Bruguiera gymnorrhiza</em> and <em>Heritiera littoralis</em> seedlings

    Effects of waterlogging, salinity and light on the productivity of <em>Bruguiera gymnorrhiza</em> and <em>Heritiera littoralis</em> seedlings

    Item type: Journal Article • Journal: African Journal of Marine Science
    This study aimed to establish the effects of waterlogging, salinity and light on the early development of mangroves. Seedlings of Bruguiera gymnorrhiza (L.) Lamk. and Heritiera littoralis Dryand were exposed to 12 weeks of waterlogging, during which time growth and...
  10. Wintertime rates of net primary production and nitrate and ammonium uptake in the southern Benguela upwelling system

    Wintertime rates of net primary production and nitrate and ammonium uptake in the southern Benguela upwelling system

    Item type: Journal Article • Journal: African Journal of Marine Science
    The elevated levels of primary productivity associated with eastern boundary currents are driven by nutrient- rich waters upwelled from depth, such that these regions are typically characterised by high rates of nitrate-fuelled phytoplankton growth. Production studies from the southern Benguela...