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Browsing by UP Author "Myburgh, Jan G."
Now showing items 1-20 of 60
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Buah-Kwofie, Archibold; Humphries, Marc S.; Combrink, Xander; Myburgh, Jan G. (Elsevier, 2018-03)Nile crocodiles (Crocodylus niloticus) are important apex predators in many tropical and subtropical aquatic habitats throughout much of sub-Saharan Africa. In South Africa, large crocodile populations inhabit lakes and ...
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Viljoen, Devon M.; Webb, E.C. (Edward Cottington); Myburgh, Jan G.; Truter, Johannes Christoff; Lang, Jeffrey W.; Myburgh, Albert (Elsevier, 2023-12)The current study assessed the ambient temperatures, and those selected, by captive adult Nile crocodiles on a commercial farm in South Africa. Non-invasive data capture techniques were developed to ensure the crocodiles ...
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Oberholster, Paul Johan; Myburgh, Jan G.; Ashton, Peter J.; Coetzee, Jan J.; Botha, Anna-Maria (Elsevier, 2012-01)Concentrations of total Aluminium (Al) and Iron (Fe) were determined in Lake Loskop over a period of four month in 2009 in samples of phytobenthos, phytoplankton, macroinvertebrates, amphibians and fish. The highest ...
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Arukwe, Augustine; Rosbak, Randi; Adeogun, Aina O.; Langberg, Hakon A.; Venter, Annette; Myburgh, Jan G.; Botha, C.J. (Christoffel Jacobus); Benedetti, Maura; Regoli, Francesco (Public Library of Science, 2015-06-18)In the present study, the biotransformation and oxidative stress responses in relation to chemical burden in the liver of male and female Nile crocodiles—Crocodylus niloticus— from a commercial crocodile farm passively ...
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Blood lead concentrations in free-ranging Nile crocodiles (Crocodylus niloticus) from South Africa Warner, Jonathan K.; Combrink, Xander; Myburgh, Jan G.; Downs, Colleen T. (Springer, 2016-07)Generally crocodilians have received little attention with regard to the effects of lead toxicity despite their trophic status as apex, generalist predators that utilize both aquatic and terrestrial habitats, thereby ...
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Brown, Geoffrey James; Forbes, Patricia B.C.; Myburgh, Jan G.; Nothling, Johan Oliviette (Wiley, 2020-08)Unbanded crocodilian eggs do not form an opaque band around their lesser circumference, indicating fertilization failure or early embryonic death. Assuming they represent fertile eggs prior to the onset of embryonic ...
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Pfitzer, Silke; Ganswindt, Andre; Fosgate, Geoffrey Theodore; Botha, P.J.; Myburgh, Jan G. (BMJ Publishing Group, 2014)The electric stunner (e-stunner) is commonly used to handle Nile crocodiles (Crocodylus niloticus) on commercial farms in South Africa, but while it seems to improve handling and safety for the keepers, no information ...
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Yatsu, Ryohei; Katsu, Yoshinao; Kohno, Satomi; Mizutani, Takeshi; Ogino, Yukiko; Ohta, Yasuhiko; Myburgh, Jan G.; Van Wyk, Johannes H.; Guillette Jr., Louis J.; Miyagawa, Shinichi; Iguchi, Taisen (Elsevier, 2016-11)Steroid hormones are a key regulator of reproductive biology in vertebrates, and are largely regulated via nuclear receptor families. Estrogen signaling is regulated by two estrogen receptor (ER) subtypes alpha and beta ...
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Brown, Geoffrey James; Forbes, Patricia B.C.; Myburgh, Jan G.; Nothling, Johan Oliviette (NISC Pty (Ltd) and Informa Limited (trading as Taylor and Francis Group, 2021)Research in other species suggests that the source of embryonic calcium (Ca) and phosphorus (P) for Crocodylus niloticus is likely yolk and shell. Using inductively coupled plasma optical emission spectroscopy (ICP-OES), ...
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Masango, Mxolisi Goodwill; Myburgh, Jan G.; Botha, C.J. (Christoffel Jacobus); Labuschagne, Leonie; Naicker, Dharmarai (Elsevier, 2008-07)The toxicity of purified microcystin-LR (MC-LR) and algal material collected during the winter and summer seasons (2005/2006) from the Hartebeespoort dam, South Africa, was investigated using the enzyme-linked immunosorbent ...
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Bengis, Roy; Govender, Dhanashree (Danny); Lane, Emily; Myburgh, Jan G.; Oberholster, Paul Johan; Buss, Peter Erik; Prozesky, Leon; Dewald, Keet (AOSIS OpenJournals, 2016-10-31)Over the past decade, several clustered, multispecies, wildlife mortality events occurred in the vicinity of two man-made earthen dams in the southern and south central regions of the Kruger National Park, South Africa. ...
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Booyse, Dirk G.; Dehority, Burk A.; Myburgh, Jan G. (Magnolia Press, 2015-12)Rumen contents were collected from ten adult female blesbok, five from a mine area with only acid drinking water available and five from a control group consuming normal, non-polluted drinking water. The mean concentration ...
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Sutherland, Anátulie; Myburgh, Jan G.; Steyn, Maryna; Becker, Piet J. (Elsevier, 2013-09)Forensic anthropologists rely on the state of decomposition of a body to estimate the post-mortem- interval (PMI) which provides information about the natural events and environmental forces that could have affected the ...
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Webb, E.C. (Edward Cottington); Veldsman, Devon Marie; Myburgh, Jan G.; Swan, G.E. (South African Society for Animal Science, 2021-02)Intensive Nile crocodile (Crocodylus niloticus) farming operates with considerable variation in housing and stocking density. In this study, current commercial stocking densities for crocodilians were investigated using ...
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Selala, Mapurunyane Callies; Botha, Anna-Maria; De Klerk, L.P.; Myburgh, Jan G.; Blettler, M.C.M.; Oberholster, Paul Johan (Springer, 2013)The occurrence, as well as the environmental fate and impact, of vegetable oil spills in freshwater wetlands have until now been unreported. Thus, the largest global vegetable oil spillage in a freshwater wetland, which ...
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Botha, C.J. (Christoffel Jacobus); Laver, P.N. (Peter); Singo, Alukhethi; Venter, E.A. (Annette); Ferreira, Gezina Catharina Helena; Rosemann, M.; Myburgh, Jan G. (IWA publishing, 2019-05)Cyanobacteria are known for their extensive and highly visible blooms in rivers or dams in Africa. One of the most important cyanobacteria is Microcystis aeruginosa which can synthesise various microcystins that may affect ...
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Iji, Oluwafikemi Temitayo; Njoya, Emmanuel Mfotie; Madikizela, Balungile; Myburgh, Jan G.; McGaw, Lyndy Joy (The South African Water Research Commission, 2021-10)Several potential genotoxins found in water samples arise from anthropogenic activities. Acid mine effluent resulting from coal mining poses serious environment concerns all over the world. The use of toxicity tests to ...
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Myburgh, Jan G.; University of Pretoria. Faculty of Veterinary Science (2013-06-11)The Department of Paraclinical Sciences of the Faculty of Veterinary Science is not only expanding its horizons, it is also digging deeper into the past. Dr Fritz Huchzermeyer, an extraordinary lecturer in the Department, ...
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Iji, Oluwafikemi Temitayo; Serem, June Cheptoo; Bester, Megan Jean; Venter, E.A. (Annette); Myburgh, Jan G.; McGaw, Lyndy Joy (Water Research Commission, 2017-01)Reactive oxygen species (ROS) production and resultant oxidative stress (OS) has been implicated as a pathway of toxicity in animal species exposed to pollutants. The gills of aquatic animals and the liver and kidneys of ...
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Stephenson, J.D.; Mills, A.; Eksteen, J.J.; Milewski, A.V.; Myburgh, Jan G. (Springer, 2011)Although numerous hypotheses have been proposed to explain geophagy, the primary driver of this behaviour remains elusive. Supplementation of scarce nutrients is one commonly cited explanation. We examined the element ...
Now showing items 1-20 of 60