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Browsing Paraclinical Sciences by Author "Oberholster, Paul Johan"
Now showing items 1-20 of 22
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Oberholster, Paul Johan; Musee, Ndeke; Botha, A-M; Chelule, P.K.; Focke, Walter Wilhelm; Ashton, Peter J. (Elsevier, 2011-03)Studies were conducted to determine the effects of a panel of seven nanomaterials (NMs), namely: a-alumina, g-alumina, precipitated silica; silica fume, calcined silica fume, colloidal antimony pentoxide (Sb2O5), and ...
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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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Dabrowski, Jacqueline; Oberholster, Paul Johan; Dabrowski, J.M.; Le Brasseur, J.; Gieskes, J. (Water Research Council, 2013)A declining crocodile population and fish mortalities attributed to pansteatitis, along with increasing blooms of Microcystis aeruginosa and Ceratium hirundinella, have led to serious concerns about water quality in Loskop ...
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Sirunda, Johannes; Oberholster, Paul Johan; Wolfaardt, Gideon; Botes, Marelize; Truter, Christoff (Wiley, 2021-09)Ecological restorations of reservoirs are implemented worldwide; however, minimal successes are reported and understood for warmer African lakes like Swakoppoort Dam, Namibia. The objectives of the study were (a) to establish ...
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Riato, Luisa; Leira, Manel; Della Bella, Valentina; Oberholster, Paul Johan (Elsevier, 2018-01)Acid mine drainage (AMD) from coal mining in the Mpumalanga Highveld region of South Africa has caused severe chemical and biological degradation of aquatic habitats, specifically depressional wetlands, as mines use these ...
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Oberholster, Paul Johan; McMillan, P; Durgapersad, K.; De Klerk, A.R.; Botha, Anna-Maria (Springer, 2014-01)The Wetland Classification and Risk Assessment Index (WCRAI) is based on manifestations of ecological processes in natural wetland ecosystems. The index is hierarchical in structure and is designed to allow identification ...
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Riato, Luisa; Bella, Valentina Della; Leira, Manel; Taylor, Jonathan C.; Oberholster, Paul Johan (Elsevier, 2017-07)Functional-based assessments to identify the effects of human-induced disturbances on diatom communities are increasingly used. However, information on the response of functional groups to natural disturbances in temporary ...
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Diatom-based models for inferring water chemistry and hydrology in temporary depressional wetlands Riato, Luisa; Leira, Manel; Bella, Valentina Della; Oberholster, Paul Johan (Springer, 2017-08)Information on the response of temporary depressional wetland diatoms to human-induced disturbances is a limited and important component for the development of temporary wetland biological assessments in human-modified ...
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Oberholster, Paul Johan; Botha, Anna-Maria (Schweizerbart, 2011-09)The relationships between water quality and the phytoplankton community within Lake Loskop and irrigation channels downstream were studied over a period of one year from April 2009 to March 2010. The phytoplankton ...
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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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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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Dabrowski, J.M.; Dabrowski, Jacqueline; Hill, L.; MacMillan, P.; Oberholster, Paul Johan (Wiley, 2014)Concentrations of pollutants were measured in water, sediment and algal samples collected along a longitudinal gradient from a stretch of the Olifants River, South Africa, that receives AMD from the Klipspruit River. The ...
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Oberholster, Paul Johan; Jappie, S.; Cheng, P.H.; Botha, A.M.; Matthews, M.W. (Taylor and Francis, 2015-03)In South Africa, little is known about the production of microcystin by the genus Anabaena Bory. In April 2012, during a cyanobacterial bloom event in Theewaterskloof Dam, Western Cape province, the plankton was sampled ...
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Genthe, Bettina; Le Roux, Wouter Jacobus; Schachtschneider, K.; Oberholster, Paul Johan; Aneck-Hahn, Natalie Hildegard; Chamier, J. (Elsevier, 2013-07)Water quality has deteriorated in the upper Olifants River system, South Africa, as a result of land use activities which include mining, agriculture and industries. A health risk assessment was conducted from 2009 to ...
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Nchabeleng, T.; Cheng, P.; Oberholster, Paul Johan; Botha, A-M; Smit, Willem J.; Luus-Powell, W.J. (Taylor and Francis, 2014-09)The effects of a decomposing cyanobacteria bloom on water quality and the accumulation of microcystin-LR equivalent toxin in fish at Loskop Dam were studied in May 2012. Enzyme-linked immunosorbent assay [ELISA] was used ...
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Oberholster, Paul Johan; Ashton, Peter J.; Botha, Anna-Maria; Kleynhans, C.J. (Academic Journals, 2012-11-08)Established microcosms containing surface water from the mesotrophic Lake Mokolo were subjected to enrichment of different concentrations with phosphorus. The microcosms were sampled through a 20 day succession period to ...
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Dabrowski, Jacqueline; Hall, Grant; Lübcker, N.; Oberholster, Paul Johan; Phillips, D.L.; Woodborne, Stephan M. (Wiley, 2014-07)1. Pansteatitis (yellow fat disease) is ubiquitous in the free-ranging population of Oreochromis mossambicus from Loskop Reservoir (LR), South Africa. The disease is nutritionally mediated and associated with a diet high ...
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Oberholster, Paul Johan; Cheng, Po-Hsun; Botha, Anna-Maria; Genthe, Bettina (Elsevier, 2014-09)The metal bioaccumulation potential of selected macroalgae species as different pH ranges were study for usage as part of a possible secondary passive AMD treatment technology in algae ponds in temperate regions during ...
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Oberholster, Paul Johan; Botha, Anna-Maria (Academic Journals, 2010-12)In this study, we monitored the formation of cyanobacterial hyperscum and crust formation in Lake Hartbeespoort using satellite images and ground monitoring. The hyperscum that formed near the reservoir wall was characterised ...
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Oberholster, Paul Johan; Dabrowski, Jacqueline; Botha, Anna-Maria (Schweizerbart, 2013-01-01)The relationships between river and lake phosphorus sensitivity, environmental drivers and catchment characteristics within the upper Olifants River and Lake Loskop were studied over a period of four years to come up with ...
Now showing items 1-20 of 22