Johann H. van Niekerk

  • Citations Per Year
Learn More
Field trips were undertaken in South Africa from 1997–2001 to determine the prevalence of poxvirus infection in Swainson’s francolin, Francolinus swainsonii. In total, 200 specimens were trapped or shot and examined for external lesions. Selected tissues from three dead specimens were removed for histopathological examination. Eighty-eight (44%) of 200(More)
Generally speaking, playbacks were often ineffective to determine the group sizes of birds since mainly males from leks responded. This limitation has not been tested properly for flocking birds such as Crested Guineafowl (Guttera edouardi) with the view to use it as a counting method. The aims of the study reported in this paper were (1) to describe the(More)
We studied the dispersion of 4-year-old southern elephant seals (Mirounga leonina) along a 75.5 km coastal area at the Courbet Peninsula, Iles Kerguelen, relative to their birth site when they were ashore to moult in early 1984. The seals were mostly faithful to their natal sites, but availability of suitable moulting habitat (e.g. wallows, vegetated areas)(More)
The mating system of the korhaans and bustards in southern Africa is either based on polygyny or monogamy. The Red-crested Korhaan (Lophotis ruficrista) has been described as polygynous but otherwise very little is known about its breeding biology. The aims were to describe the population structure and male behavior during breeding. The data collected for(More)
This paper describes the use of farm dams by spur-winged geese (Plectropterus gambensis) on the Highveld of South Africa. Applications for mining rights on coal seams located under wetlands have increased, which raises the question whether the loss of the waterfowl habitat can be mitigated. Since the spur-winged geese were observed on natural wetlands and(More)
How do Orange River Francolins (Scleroptila levaillantoides) adapt to an intensive farming landscape with grass (grazing) camps and crop cultivation? To answer this question, a study was carried out in south-east of Johannesburg in South Africa to clarify the interaction of francolins with a landscape consisting of land use mosaics. A transect-road of 45 km(More)
  • 1