Articles by Author: Margaretha D Hofmeyr

Search results for Margaretha D Hofmeyr

We found 41 results for you
  1. Tick infestations in the Namaqualand speckled padloper, <em>Homopus signatus signatus</em> (Gmelin, 1789)

    Tick infestations in the Namaqualand speckled padloper, <em>Homopus signatus signatus</em> (Gmelin, 1789)

    Item type: Journal Article • Journal: African Zoology
    Many terrestrial chelonians are parasitized by ticks, but we have a poor understanding of what determines tick infestations on chelonian hosts. We counted ticks on Homopus signatus signatus during each spring in the years 2001–2004, and evaluated tick frequencies in...
  2. Sexual disparity in activity patterns and time budgets of angulate tortoises (<em>Chersina angulata</em>) on Dassen Island, South Africa

    Sexual disparity in activity patterns and time budgets of angulate tortoises (<em>Chersina angulata</em>) on Dassen Island, South Africa

    Item type: Journal Article • Journal: African Zoology
    Behavioural frequencies and time budgets for male and female Chersina angulata were recorded in spring, September 2004. The daily activity of the population was 10.51 ± 0.42 h (mean ± CI), but individual males and females were in the open...
  3. Genetic variation in three&gt; <em>Chersina angulata&gt;</em> (angulate tortoise) populations along the west coast of South Africa&gt;

    Genetic variation in three&gt; <em>Chersina angulata&gt;</em> (angulate tortoise) populations along the west coast of South Africa&gt;

    Item type: Journal Article • Journal: African Zoology
    We investigated genetic variation within and among three populations of Chersina angulata; two in the southwestern Cape (West Coast National Park and Dassen Island) of South Africa and Kleinzee in the northwestern parts of the species’ range. Mitochondrial DNA sequences...
  4. Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise <em>Psammobates geometricu</em>s

    Leaf biomechanics as a potential tool to predict feeding preferences of the geometric tortoise <em>Psammobates geometricu</em>s

    Item type: Journal Article • Journal: African Zoology
    Food and non food plant characteristics were studied for the geometric tortoise, Psammobates geometricus, to test the hypothesis that feeding preferences in tortoises may be influenced by the mechanical properties of plant leaves. Twelve focal feeding observations made between 8...
  5. Season, sex and age variation in the haematology and body condition of geometric tortoises <em>Psammobates geometricus</em>

    Season, sex and age variation in the haematology and body condition of geometric tortoises <em>Psammobates geometricus</em>

    Item type: Journal Article • Journal: African Zoology
    Body condition and haematological indices provide powerful information when assessing wildlife health. Reference intervals for these indices can facilitate wildlife management, and would benefit initiatives to save the Critically Endangered geometric tortoise (Psammobates geometricus). We collected data from 126 geometric...
  6. Erythrocyte morphology of the Critically Endangered Geometric Tortoise <em>Psammobates geometricus</em>: effects of season, sex and age

    Erythrocyte morphology of the Critically Endangered Geometric Tortoise <em>Psammobates geometricus</em>: effects of season, sex and age

    Item type: Journal Article • Journal: African Journal of Herpetology
    Land transformation reduced the habitat of Psammobates geometricus to small isolated fragments, rendering the species vulnerable to extinction. Field biologists often use erythrocyte metrics to assess wildlife health but need baseline values to distinguish normal variations from disease or chronic...
  7. Variation in the daily activity, movement and refugia of Critically Endangered geometric tortoises, <em>Psammobates geometricus</em>, in autumn and spring

    Variation in the daily activity, movement and refugia of Critically Endangered geometric tortoises, <em>Psammobates geometricus</em>, in autumn and spring

    Item type: Journal Article • Journal: African Journal of Herpetology
    To help assess habitat requirements of Critically Endangered geometric tortoises, we used thread-trailing to measure daily activity, movements and refugia of adult Psammobates geometricus in autumn and spring 2002. We found strong differences between seasons, and effects of weather, individuals...
  8. Entanglement of pinnipeds at Marion Island

    Entanglement of pinnipeds at Marion Island

    Item type: Journal Article • Journal: South African Journal of Marine Science
    During the period April 1991–March 1996, 10 entangled Antarctic fur seals Arctocephalus gazella, 28 entangled Subantarctic fur seals A. tropicalis and one entangled southern elephant seal Mirounga leonina were observed at Marion Island, Southern Ocean. Entanglement of fur seals was...
  9. Trends of African penguin <em>Spheniscus demersus</em> populations in the 20th century

    Trends of African penguin <em>Spheniscus demersus</em> populations in the 20th century

    Item type: Journal Article • Journal: South African Journal of Marine Science
    The entire nesting population of African penguins Spheniscus demersus was about 575 000 adults at the start of the 20th century. Numbers halved by the 1950s and continued to fall to about 220 000 by the late 1970s and about...