Articles by Author: W Richard J Dean

Search results for W Richard J Dean

We found 213 results for you
  1. Fluctuations in bird numbers on sewage treatment ponds in an arid environment, South Africa

    Fluctuations in bird numbers on sewage treatment ponds in an arid environment, South Africa

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Regular twice-monthly counts of birds associated with water at the Prince Albert sewage disposal facility recorded 69 species, of which 16 species (23.5%) were waterbirds (ducks, Red-knobbed Coot Fulica cristata and Little Grebe Tachybaptus ruficollis) and 21 species were shorebirds...
  2. The feeding ecology of Rüppell's Parrot, <em>Poicephalus rueppellii</em>, in the Waterberg, Namibia

    The feeding ecology of Rüppell's Parrot, <em>Poicephalus rueppellii</em>, in the Waterberg, Namibia

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Rüppell's Parrot, Poicephalus rueppellii, inhabits a markedly seasonal environment in Namibia and feed on plant seeds that respond to that seasonality. Although Rüppell's Parrots were seen feeding at 37 plant species they showed clear preferences. The diet was dominated by...
  3. Outcomes 30 days after ICU admission: the 30DOS study

    Outcomes 30 days after ICU admission: the 30DOS study

    Item type: Journal Article • Journal: Southern African Journal of Anaesthesia and Analgesia
    Background: The spectrum of illness and long-term outcome of critically ill patients admitted to intensive care units (ICUs) in South Africa remains largely unknown.
  4. Ants (Formicidae) as food for birds in southern Africa: opportunism or survival?

    Ants (Formicidae) as food for birds in southern Africa: opportunism or survival?

    Item type: Journal Article • Journal: Ostrich: Journal of African Ornithology
    Ants (Hymenoptera: Formicidae) are eaten by a number of bird species in southern Africa. Our database contained 545 species (excluding waterbirds and raptors), of which 179 species have been observed feeding on ants, or had ants in their stomachs. Ants...
  5. Multiple Resource Utilisation Developments in Mondi Forests

    Item type: Journal Article • Journal: South African Forestry Journal
    Defined as the use of available resources other than the planted trees on Mondi's landholdings, the development of various MRU projects is described from 1975 onwards. Projects are differentiated into those that are directly dependant on the presence of planted...
  6. Grassland research and extension: Present and future

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    It is indeed a great honour to be invited to give the opening address at this Twenty‐third Congress of the Grassland Society. It seems pertinent to review briefly grassland research, its impact on the farmer, and consider where we should...
  7. Preferential utilization of pans by springbok <em>(Antidorcas marsupialis)</em>

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    Forage utilization by springbok in pans and surrounding habitats was compared at one karroid shrubland site and two desert grassland sites and was found to be greater in pans than on adjacent plains and dunes. Springbok used pan areas for...
  8. Effects of animal activity on the absorption rate of soils in the southern Karoo, South Africa

    Item type: Journal Article • Journal: Journal of the Grassland Society of Southern Africa
    The rates of absorption into various microsites in Karoo soils were compared. The absorption of water by hard, bare intershrub soils was significantly increased by the presence of emergence holes of adult cicadas (Homoptera: Cicadidae) and near nest‐mounds of the...