• Publications
  • Influence
The impact of invasive fish and invasive riparian plants on the invertebrate fauna of the Rondegat River, Cape Floristic Region, South Africa
Investigation of the impact of invasive smallmouth bass and black wattle on assemblages of macroinvertebrates and fish in a cobble-bed foothill river indicates that smallmouthbass, in contrast to indigenous fish, do not exert a strong influence on the abundance of their invertebrate prey. Expand
Extreme levels of intra-specific divergence among Cape Peninsula populations of the Cape galaxias, Galaxias zebratus Castelnau 1861, reveals a possible species complex
Results suggest that periods of low sea level may have been important in creating opportunities and alternative routes for dispersal and migration for Cape Peninsula populations. Expand
Present status and historical changes in the fish fauna of the Berg River, South Africa
It is concluded that the strong correlation between the spread of alien species through the Berg River system and the concomitant decline of indigenous species is strongly suggestive of a causative relationship. Expand
Threatened fishes of the world: Labeo seeberi Gilchrist & Thompson, 1911 (Cyprinidae)
  • D. Impson
  • Biology
  • Environmental Biology of Fishes
  • 1 August 1997
The Clanwilliam sandfish is now the most threatened of the three large endemic migratory cyprinids of the Olifants River system and may be a particularly sensitive indicator of the overall health of this system. Expand
Health Status of Ornamental Freshwater Fishes Imported to South Africa: A Pilot Study
The health status of ornamental freshwater fishes imported to South Africa was examined for the presence of external parasites, and processed for virus isolation and for bacterial and mycobacterial culture. Expand
Rethinking refuges: Implications of climate change for dam busting
Climate change is projected to alter river discharge in every populated basin in the world. In some parts of the world, dam removal now outpaces their construction and the diminishing cost efficiencyExpand
Coordinating invasive alien species management in a biodiversity hotspot: The CAPE Invasive Alien Animals Working Group
Background: The effectiveness of invasive alien species management in South Africa, and elsewhere, can be mproved by ensuring there are strong links and feedbacks between science and management. TheExpand
Genetic and Morphological Characterization of Freshwater Shrimps (Caridina africana Kingsley, 1882) Reveals the Presence of Alien Shrimps in the Cape Floristic Region, South Africa.
Following the present study, the alien shrimp has survived the Western Cape's winter and dispersed into a nearby tributary of the Eerste River System, hence posing an additional potential threat to endangered endemics. Expand
Have our provincial aquatic scientists become critically endangered? : capacity development - feature
South Africa is a country blessed with extraordinary levels of biodiversity (ranked third in the world) and is the only country to have one of the world's six floral kingdoms (Cape Floral) containedExpand
Threatened Fishes of the World: Barbus andrewi Barnard, 1937 (Cyprinidae)
  • D. Impson
  • Geography
  • Environmental Biology of Fishes
  • 1 June 2001
Common names: Whitefish (E), witvis (Afrikaans). Conservation status: Vulnerable (Baillie & Groombridge 1996). Identification: D IV 8, A III 6, LL 38-41, 16 scales around caudal peduncle. SerrationsExpand