Articles by Author: Jacklyn J Ellis

Search results for Jacklyn J Ellis

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  1. The social correlates of self-directed behaviour and faecal glucocorticoid levels among adult male olive baboons (<em>Papio hamadryas anubis</em>) in Gashaka-Gumti National Park, Nigeria

    The social correlates of self-directed behaviour and faecal glucocorticoid levels among adult male olive baboons (<em>Papio hamadryas anubis</em>) in Gashaka-Gumti National Park, Nigeria

    Item type: Journal Article • Journal: African Zoology
    Sociality confers many benefits to gregarious animals, but group-living does not come without associated costs. Social living can cause anxiety, which if prolonged can lead to stress. We investigate correlates of anxiety and stress among wild adult male olive baboons...
  2. Die Invloed van Bemesting op die Groei van Jong <em>Pinus radiata</em>, in Potte met Twee Tipiese Bosbougronde van die Wes-Kaap

    Item type: Journal Article • Journal: South African Forestry Journal
    The effects of N, P and K on Pinus radiata were investigated by growing plants in pots filled with two typical forest soils in the Western Cape. Significant interactions were found. On soil A, a coarse sand from Grabouw, no...
  3. The presence of condensed tannin in the leaves of <em>Eulalia villosa</em>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The hypothesis that grasses contain tannin deposits in the leaf epidermal cells was tested using the leaf laminas of a southern African sourveld grass, Eulalia villosa (Thunb.) Nees. The leaf material was assayed for total phenols, condensed tannin and biologically‐active...
  4. A comparative histochemical study of plant polyphenols in southern African grasses

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Recent anatomical studies have shown that tannin‐like substances (TLS) occur in the epidermal cells of a number of southern African tropical grasses, and the presence of condensed tannins in grasses has been confirmed by chemical analyses. A number of species...
  5. The relationship between subsoil colour and degree of wetness in a suite of soils in the Grabouw district, Western Cape I. Characterization of colour-defined horizons

    The relationship between subsoil colour and degree of wetness in a suite of soils in the Grabouw district, Western Cape I. Characterization of colour-defined horizons

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Soil colour is an easily identifiable property that is invariably used as a parameter in all soil classification systems including the system used in South Africa. To test the hypothesis that soil colour is a reflection of the soil water...
  6. The relationship between subsoil colour and degree of wetness in a suite of soils in the Grabouw district, Western Cape II. Predicting duration of water saturation and evaluation of colour definitions for colour-defined horizons

    The relationship between subsoil colour and degree of wetness in a suite of soils in the Grabouw district, Western Cape II. Predicting duration of water saturation and evaluation of colour definitions for colour-defined horizons

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    Existing colour indices were evaluated to determine their correlation with duration of water saturation, for a hydrosequence in the Grabouw district, Western Cape. Correlation coefficients ranged between 0.31 and 0.63. More simple colour indices were developed. Dry soil colour is...
  7. ON A MAYER-VIETORIS SEQUENCE IN THE COHOMOLOGY OF GROUPS

    ON A MAYER-VIETORIS SEQUENCE IN THE COHOMOLOGY OF GROUPS

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    We study an exact sequence in the cohomology of groups arising from a group G with two normal subgroups M, N ◃ G, the coefficients being in a G/MN-module A.
  8. Soil and vegetation changes across a Succulent Karoo grazing gradient

    Soil and vegetation changes across a Succulent Karoo grazing gradient

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    This study describes soil and vegetation changes radiating out from a central watering point on a livestock farm in the Succulent Ceres Karoo (Tanqua). The aim was to identify possible relationships between long-term grazing pressure, and soil and vegetation properties...
  9. Nutrient levels of three <em>Eucalyptus</em> species/provenances, measured over four seasons in a trial along the sandy, dry, Cape West Coast of South Africa

    Nutrient levels of three <em>Eucalyptus</em> species/provenances, measured over four seasons in a trial along the sandy, dry, Cape West Coast of South Africa

    Item type: Journal Article • Journal: The Southern African Forestry Journal
    Foliage nutrient content of 3 to 6-year old Eucalyptus species/provenances (E. camaldulensis, E. globulus and E. grandis x E. tereticornis) were analysed for eleven elements over a four-year period. The trial was planted on three sites, adjacent to each other,...
  10. Psychological Well-Being and the Metabolic Syndrome in African and Caucasian Women in South Africa

    Psychological Well-Being and the Metabolic Syndrome in African and Caucasian Women in South Africa

    Item type: Journal Article • Journal: Journal of Psychology in Africa
    This study explored the association between comprehensive psychological well-being and the metabolic syndrome (MS), as well as whether women without MS markers differ significantly from women with MS (three or more markers) on specific facets of psychological well-being. African (N=102)...