Browsing by Author "Jansen, Raymond"

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    Age- and sex-based variation in helminth infection of helmeted guineafowl (Numida meleagris) with comments on Swainson's spurfowl (Pternistis swainsonii) and Orange River francolin (Scleroptila levaillantoides)
    (Southern African Wildlife Management Association, 2008) Davies, Owen R; Junker, Kerstin; Jansen, Raymond; Crowe, Timothy M; Boomker, Joop
    Gastrointestinal tracts from 48 helmeted guineafowl (Numida meleagris), five Swainson's spurfowl (Pternistis swainsonii) and a single Orange River francolin (Scleroptila levaillantoides) were examined for helminth parasites. Twelve species of helminths were found in helmeted guineafowl, comprising six nematodes, five cestodes and a single acanthocephalan. Six species of nematodes were recovered from Swainson's spurfowl and a single nematode was recovered from the Orange River francolin. First-year guineafowl had more than twice the intensity of infection than did adult guineafowl, particularly regarding the acanthocephalan Mediorhynchus gallinarum, the caecal nematodes Subulura dentigera and S. suctoria, and the cestodes Octopetalum numida, Hymenolepis cantaniana and Numidella numida. Female guineafowl had significantly higher intensities of infection than males, especially concerning M. gallinarum, S. dentigera and N. numida and the nematode Gongylonema congolense. The recovery of the cestode Retinometra sp. from helmeted guineafowl constitutes a new host-parasite record.
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    Population biology, behavioural ecology and management of the Redwing Francolin Francolinus levaillantii and Swainson's Spurfowl Pternistis swainsonii
    (2001) Jansen, Raymond; Crowe, Timothy; Little, Rob
    This study was undertaken to assess the status of Redwing Francolin on farmland, particularly within the montane grasslands of Mpumalanga Province, and Swainson's Spurfowl within the Springbok Flats, Northen Province. To date, there had been no scientific studies of the impacts of habitat transformation via agriculture on their population biology.