Articles by Author: F Van Der Heyden

Search results for F Van Der Heyden

We found 10 results for you
  1. Patchiness in semi‐arid dwarf shrublands: Evidence from satellite‐derived indices for elevated CO<sub>2</sub> assimilation rates on a geochemical mound in the Karoo National Park, South Africa

    Patchiness in semi‐arid dwarf shrublands: Evidence from satellite‐derived indices for elevated CO<sub>2</sub> assimilation rates on a geochemical mound in the Karoo National Park, South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Satellite‐derived vegetation indices were used to identify a geochemical mound of higher active greenness in the Karoo National Park, Beaufort West, South Africa. We determined whether this mound was occupied by plants with higher CO2 assimilation rate. Plant cover on...
  2. Research note: Evaluation of the reliability of local farmer knowledge in Namaqualand, South Africa

    Research note: Evaluation of the reliability of local farmer knowledge in Namaqualand, South Africa

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    Local farmer knowledge of species distribution patterns and plant palatability in Namaqualand, South Africa, was assessed using Participatory Rural Appraisal techniques. These findings were compared with the results obtained using phytosociological techniques (species distribution), and with palatability indices published in...
  3. Responses to sheep browsing at different stocking rates: Water relations, photosynthesis and carbon allocation in two semi‐arid shrubs

    Responses to sheep browsing at different stocking rates: Water relations, photosynthesis and carbon allocation in two semi‐arid shrubs

    Item type: Journal Article • Journal: African Journal of Range & Forage Science
    The ecophysiological responses of two karoo shrubs to sheep browsing at different stocking rates were studied. The responses of a relatively unpalatable shrub (Pteronia tricephala), and of a shrub of greater palatability (Eriocephalus ericoides) were examined at high, intermediate and...
  4. Significant population genetic structuring of the holoplanktic scyphozoan <em>Pelagia noctiluca</em> in the Atlantic Ocean

    Significant population genetic structuring of the holoplanktic scyphozoan <em>Pelagia noctiluca</em> in the Atlantic Ocean

    Item type: Journal Article • Journal: African Journal of Marine Science
    Pelagia noctiluca is thought to have a global distribution, yet our understanding of genetic connectivity across the range of this problem animal is poor. Here, we investigate the genetic structure of populations off southern Africa using mitochondrial COI and nuclear...
  5. Evidence of hybridisation within the genus <em>Chrysoblephus</em> and conserved nuclear sequences of South African sparids (Teleostei: Sparidae)

    Evidence of hybridisation within the genus <em>Chrysoblephus</em> and conserved nuclear sequences of South African sparids (Teleostei: Sparidae)

    Item type: Journal Article • Journal: African Journal of Marine Science
    Several hybridisation events have been recorded in marine fish, yet there is little information for southern African species. Here we present evidence for hybridisation within the genus Chrysoblephus (Sparidae), by analysing a fish caught off KwaZulu-Natal, off the east coast...
  6. Reviewing evidence of marine ecosystem change off South Africa

    Reviewing evidence of marine ecosystem change off South Africa

    Item type: Journal Article • Journal: African Journal of Marine Science
    Recent changes have been observed in South African marine ecosystems. The main pressures on these ecosystems are fishing, climate change, pollution, ocean acidification and mining. The best long-term datasets are for trends in fishing pressures but there are many gaps,...
  7. Long current to nowhere? — Genetic connectivity of <em>Jasus tristani</em> populations in the southern Atlantic Ocean

    Long current to nowhere? — Genetic connectivity of <em>Jasus tristani</em> populations in the southern Atlantic Ocean

    Item type: Journal Article • Journal: African Journal of Marine Science
    The commercially exploited spiny lobster Jasus tristani has a disjunct distribution in the southern Atlantic Ocean, with populations occurring at the Tristan da Cunha Archipelago, Gough Island and on Vema Seamount. A distance of 2 000km separates Vema and the...
  8. Why do we need to integrate population genetics into South African marine protected area planning?

    Why do we need to integrate population genetics into South African marine protected area planning?

    Item type: Journal Article • Journal: African Journal of Marine Science
    South Africa is home to a wide variety of marine flora and fauna distributed over at least three biogeo-graphic provinces. Currently, 9% of the coastline is protected by ‘no-take’ marine protected areas (MPAs), but the distribution of MPAs is uneven...
  9. High population connectivity and Pleistocene range expansion in the direct-developing plough shell <em>Bullia rhodostoma</em> along the South African coast

    High population connectivity and Pleistocene range expansion in the direct-developing plough shell <em>Bullia rhodostoma</em> along the South African coast

    Item type: Journal Article • Journal: African Journal of Marine Science
    Pleistocene climatic and oceanographic changes have influenced the distribution of marine biodiversity in southern Africa. Most evidence, however, has been derived from rocky shore or demersal taxa; data on sandy shore species are limited, despite severe threats to many sandy...
  10. Introduced Pacific oysters <em>Crassostrea gigas</em> in South Africa: demographic change, genetic diversity and body condition

    Introduced Pacific oysters <em>Crassostrea gigas</em> in South Africa: demographic change, genetic diversity and body condition

    Item type: Journal Article • Journal: African Journal of Marine Science
    Successful aquaculture species are often chosen for their fast growth rates and fecundity, which are also characteristics of invasive species. The Pacific oyster Crassostrea gigas, which constitutes 80% of global oyster trade, has been confirmed as invasive in 17 of...