Articles by Author: Michael Heistermann

Search results for Michael Heistermann

We found 230 results for you
  1. Physiological stress levels in the endemic and endangered Udzungwa red colobus vary with elevation

    Physiological stress levels in the endemic and endangered Udzungwa red colobus vary with elevation

    Item type: Journal Article • Journal: African Zoology
    Habitat loss and fragmentation inevitably cause biodiversity decline, a major concern for the conservation of endangered species. Primates are of particular interest, because they are highly vulnerable to forest fragmentation. In this study, we investigated faecal glucocorticoid measurements (FGCM), an...
  2. 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...
  3. Book Review

    Book Review

    Item type: Journal Article • Journal: South African Journal of Philosophy
  4. Elucidation of seasonal pigmentation patterns in the involucral leaves of <em>Leucadendron</em> ‘Safari Sunset’

    Elucidation of seasonal pigmentation patterns in the involucral leaves of <em>Leucadendron</em> ‘Safari Sunset’

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    This study investigates seasonal pigmentation patterns found in the involucral leaves of Leucadendron ‘Safari Sunset’, with the long-term aim of colour manipulation. Treatments comprised deconed shoots and shoots in which the opening of the flower head was physically prevented. During...
  5. The function of regreening in yellow female <em>Leucadendron</em> (Proteaceae)

    The function of regreening in yellow female <em>Leucadendron</em> (Proteaceae)

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    What do female Leucadendron stand to gain by regreening their involucral leaves rather than discarding them after flowering? Regreening of involucral leaves could contribute to the carbon budget and/or protect the developing cone-shaped inflorescence during seed development. This was determined...
  6. Web-based teaching, learning and research using accessible real-time data obtained from field-based agrometeorological measurement systems<xref rid="FN0001"/>

    Web-based teaching, learning and research using accessible real-time data obtained from field-based agrometeorological measurement systems<xref rid="FN0001"/>

    Item type: Journal Article • Journal: South African Journal of Plant and Soil
    To enhance teaching and learning in agrometeorology and allied disciplines, a Web-based data and information system was developed. The system uses field-based agrometeorologcial measurements, from automatic weather, radiation and temperature stations, to collect and display near real-time and previous data...
  7. RESONANT PERTURBATIONS OF HIGHER-ORDER HARMONIC OSCILLATION

    RESONANT PERTURBATIONS OF HIGHER-ORDER HARMONIC OSCILLATION

    Item type: Journal Article • Journal: Quaestiones Mathematicae
    A higher-order extension of the perturbed Simple Harmonic Oscillator is discussed. The differential equation is