10 Works

Survey of Jewish South Africans

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Range-wide population viability analyses reveal high sensitivity to wildflower harvesting in extreme environments

Martina Treurnicht, Frank Schurr, Jasper Slingsby, Karen Esler & Joern Pagel
The ecological effects of harvesting from wild populations are often uncertain, especially since the sensitivity of populations to harvesting can vary across species’ geographical ranges. In the Cape Floristic Region (CFR, South Africa) biodiversity hotspot, wildflower harvesting is widespread and economically important, providing an income to many rural communities. However, with very few species studied to date, and without considering range-wide sensitivity to harvesting, there is limited information available to ensure the sustainability of wildflower...

Irradiations at the High-Energy Neutron Facility at iThemba LABS

A. Buffler, G. Reitz, S. Röttger, F. D. Smit & F. Wissmann
Abstract: Secondary high-energy neutrons are produced when high-energy particles (of several GeV) interact with matter as it is the case for cosmic radiation impinging on the Earth’s atmosphere, during ion-beam therapy or on shielding at high-energy particle accelerators. Especially, after traversing a large amount of matter, the residual neutron energy spectrum exhibits two energy regions which mainly contribute to the total ambient dose equivalent: around 1 MeV (evaporation peak) and around 100 MeV. Particle detectors...

Targeting acetylcholine receptors to enhance immunity to infection

William Horsnell, Luke B. Roberts, Corinna Corinna Schnoeller, Matthew Darby, Claire Mackowiak, Delphine Sedda, Valerie Quesniaux, Bernhard Ryffel, Rachel Vaux, Rita Berkachy, Kleoniki Gounaris & Murray E. Selkirk

Environmental heterogeneity explains contrasting plant species richness between the South African Cape and southwestern Australia

Ruan Van Mazijk, Michael D. Cramer & G. Anthony Verboom
Aim: To assess whether a difference in species richness per unit area between two mediterranean-type biodiversity hotspots is explained by differences in environmental heterogeneity. Location: The Greater Cape Floristic Region, South Africa (GCFR) and Southwest Australian Floristic Region (SWAFR). Taxon: Vascular plants (tracheophytes). Methods: Comparable, geospatially explicit environmental and species occurrence data were obtained for both regions and used to generate environmental heterogeneity and species richness raster layers. Heterogeneity in multiple environmental variables and species...

How hornbills handle heat: sex-specific thermoregulation in the southern yellow-billed hornbill

Andrew McKechnie, Barry Van Jaarsveld, Nigel Bennett, Zenon Czenze, Ryno Kemp, Tanja Van De Ven & Susan Cunningham
At a global scale, thermal physiology is correlated with climatic variables such as temperature and aridity. There is also evidence that thermoregulatory traits vary with fine-scale microclimate, but this has received less attention in endotherms. Here we test the hypothesis that avian thermoregulation varies with microclimate and behavioural constraints in a non-passerine bird. Male and female southern yellow-billed hornbills (Tockus leucomelas) experience markedly different microclimates while breeding, with the female sealing herself into a tree...

SARS-CoV-2 encephalitis presenting as a clinical cerebellar syndrome: a case report

Katryn Oosthuizen, Elizabeth Christina Steyn, Lawrence Tucker, Innocent Vusimusi Nchube, Diana Hardie & Suzaan Marais
This report contributes to the rapidly expanding knowledgebase of COVID-19-associated neurological syndromes and highlights uncertainties regarding the pathogenesis of cerebellar dysfunction in, and optimal management of, patients with COVID-19-associated encephalitis.

Data from: Malar stripe size and prominence in peregrine falcons vary positively with solar radiation: Support for the solar glare hypothesis

Michelle Vrettos, Chevonne Reynolds & Arjun Amar
Many falcons (Falco spp.) exhibit a distinct dark plumage patch below the eye, termed the malar stripe. This stripe is hypothesised to reduce the amount of solar glare reflected into the eyes while foraging, thereby increasing hunting efficiency in bright conditions. Here, we use a novel, global-scale correlative approach to test this “solar glare hypothesis” in peregrine falcons (Falco peregrinus), the most widespread falcon species, using web-sourced photographs from across the species’ global range. We...

Registration Year

  • 2021
    10

Resource Types

  • Dataset
    8
  • Data Paper
    1
  • Text
    1

Affiliations

  • University of Cape Town
    10
  • iThemba Laboratory
    1
  • University of Hohenheim
    1
  • Helmholtz Zentrum München
    1
  • University of Pretoria
    1
  • University of Orléans
    1
  • French National Centre for Scientific Research
    1
  • University of Birmingham
    1
  • University of the Witwatersrand
    1
  • Imperial College London
    1