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Documents disponibles écrits par cet auteur (5)
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Article
Johann H. van Niekerk, AuteurThis paper describes the plumage and morphology development of 11 age classes of Red-necked Spurfowl Pternistis afer to assist with field observations. Sixteen spurfowl were marked with coloured leg rings in the Cannon Rocks Holiday Resort, East[...]
Article
Johann H. van Niekerk, AuteurFifty-five Crested Francolins, Dendroperdix sephaena sephaena, were trapped, marked, retrapped and observed from 1984 to 1988 to assess and describe gender and age criteria based on morphological measurements and plumage characteristics on the f[...]
Article
Johann H. van Niekerk, AuteurThis study describes the relationship between Helmeted Guineafowl Numida meleagris and invasive alien trees on livestock and maize farms south-east of Johannesburg, Gauteng province, South Africa. The dependence of the birds on alien trees affec[...]
Article
Johann H. van Niekerk, AuteurTransect field observations were conducted on the behaviour of Crested Francolin Dendroperdix sephaena to describe male coalitions in the Borakalalo National Park, North West province, South Africa during May, August, October and December 2008, [...]
Article
Johann H. van Niekerk, AuteurDans Ostrich (88(3) 2017)Uniparental care often means that males do not contribute to the wellbeing of their offspring. For this reason, little attention has been given to avian species where the absent male contributes indirectly to the wellbeing of his chicks. This pa[...]
