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Aerial and Aquatic Respiration in the River Crab Potamonautes Warreni Calman with Notes on Gill Structure
Item type: Journal Article • Journal: Southern African Journal of Aquatic Sciences • Authors: W.J. van Aardt --- Department of Zoology, South AfricaThe oxygen consumption rate (ṀO2) for Potamonauteus warreni Calman (= Potamon warreni (Calman) kept in 25 °C water was 34,4 μmol 1−1 O2 kg−1 and after 72 hours in 98% R.H. air the rate was 31,9 μmol 1−1 O2 kg−1... -
Quantitative aspects of oxygen and carbon dioxide exchange through the lungs in Ocypode ceratophthalmus (Crustacea: Decapoda) during rest and exercise in water and air
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: WJ van Aardt --- School of Environmental Sciences and Development, South AfricaGhost crabs Ocypode ceratophthalmus were exercised in air and water to measure CO2 and O2 exchange rates using the method of instantaneous measurements of oxygen consumption rate (MO2) where applicable. Average heart rate increased from 100 to nearly 400 pulses... -
Taxation students’ perceptions of open-book assessment prior to the qualifying examination of South African chartered accountants
Item type: Journal Article • Journal: South African Journal of Accounting Research • Authors: H du Preez --- Department of Economics and Management, C S du Preez --- Department of Economics and Management,In this study taxation students’ perceptions of open-book assessment, prior to their exposure to open-book assessment in the qualifying examination of South African chartered accountants, is explored. A focus group was conducted using the Interactive Qualitative Analysis methodology. In this... -
Oxygen dissociation curves of whole blood from the Egyptian free-tailed bat, Tadarida aegyptiaca E. Geoffroy, using a thin-layer optical cell
Item type: Journal Article • Journal: African Zoology • Authors: W.J. van Aardt --- School of Environmental Sciences and Development, South Africa G.N. Bronner --- Department of Zoology, South Africa Marie-Louise de Necker --- School of Environmental Sciences and Development, South AfricaTadarida aegyptiaca (mean body mass 13.5 g) is a fast flying insectivorous bat that hunts in open areas for extended periods, covering extensive distances during its foraging bouts. Whole blood samples taken from the wing arteries were analysed for 2,3-diphosphoglyceric... -
The materiality of marriage payments
Item type: Journal Article • Journal: Anthropology Southern Africa • Authors: Hylton White --- Department of Anthropology, South AfricaIt is generally agreed that rates of marriage are declining in Southern Africa. It is also clear that for people who are wealthy enough to marry, the long-standing constitution of marriage as process is increasingly replaced by a making of... -
Respiration and hemoglobin function in the giant African bullfrog Pyxicephalus adspersus Tschudi (Anura: Pyxicephalidae) during rest, exercise and dormancy
Item type: Journal Article • Journal: African Journal of Herpetology • Authors: W.J. van Aardt --- North-West University, South Africa RoyE. Weber --- University of Aarhus, DenmarkThe survival strategies of frogs exposed to harsh conditions include various forms of dormancy. Giant bullfrogs Pyxicephalus adspersus subjected to slow desiccation without access to moist substrata over winter in cocoons during dormancy. We found that Pyxicephalus can survive long...