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Browsing by Author "Botha, A-M"

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Assessment of the effect of nanomaterials on sediment-dwelling invertebrate Chironomustentans larvae

Author: Oberholster, Paul J ; Musee, N ; Botha, A-M ; Botha, PK ; Focke, WW ; Ashton, PJ Date: Mar 2011 Studies were conducted to determine the effects of a panel of seven nanomaterials (NMs), namely: a-alumina, -alumina, precipitated silica; silica fume, calcined silica fume, colloidal antimony pentoxide (Sb2O5), and superfine amorphous ferric ... Read more
Bioaccumulation of aluminium and iron in the food chain of Lake Loskop, South Africa

Author: Oberholster, Paul J ; Myburgh, JG ; Ashton, PJ ; Coetzee, JJ ; Botha, A-M Date: Jan 2012 Concentrations of total aluminium (Al) and iron (Fe) were determined in Lake Loskop over a period of four months in 2009 in samples of phytobenthos, phytoplankton, macroinvertebrates, amphibians and fish. The highest concentrations of Al and ... Read more
An ecotoxicological screening tool to prioritise acid mine drainage impacted streams for future restoration

Author: Oberholster, Paul J ; Genthe, Bettina ; Hobbs, P ; Cheng, Po-Hsun ; De Klerk, Arno R ; Botha, A-M Date: May 2013 Streams impacted by acid mine drainage (AMD) typically present water exhibiting low pH and high metal concentrations. These factors result in the environmental degradation of watercourses. The objective of this study was to develop and evaluate ... Read more
An evaluation of the endocrine disruptive potential of crude oil water accommodated fractions and crude oil contaminated surface water to freshwater organisms using in vitro and in vivo approaches

Author: Truter, JC ; Van Wyk, JH ; Oberholster, Paul J ; Botha, A-M ; Mokwena, LM Date: May 2017 Knowledge regarding the potential impacts of crude oil on endocrine signaling in freshwater aquatic vertebrates is limited. The expression of selected genes as biomarkers for altered endocrine signaling was studied in African clawed frog, ... Read more
Identification of toxigenic microcystis strains after incidents of wild animal mortalities in the Kruger National Park, South Africa

Author: Oberholster, Paul J ; Myburgh, JG ; Govender, D ; Bengis, R ; Botha, A-M Date: 2009 The eutrophic process potentially caused by a high urine and faecal load resulting from an unusually high hippopotamus (Hippopotamus amphibious) density in the Nhlanganzwane Dam, Kruger National Park, South Africa, triggered a chain of events ... Read more
Linking climate change and progressive eutrophication to incidents of clustered animal mortalities in different geographical regions of South Africa

Author: Oberholster, Paul J ; Botha, A-M ; Myburgh, JG Date: Nov 2009 The paper highlights results that show a potential shift in certain phytoplankton communities against a background of eutrophication, the authors predict an increase in blooms of cyanophytes and poisoning incidences by previously non dominant ... Read more
Linking ecotoxigenomic tools with ecological data to support river restoration

Author: Jappie, S ; Botha, A-M ; Oberholster, Paul J Date: Oct 2012 In this study, specific pollutants and their particular sub-cellular effect on organisms were identified through the use of ecotoxigenomic tools. Read more
Microcystin-LR equivalent concentrations in fish tissue during a postbloom Microcystis exposure in Loskop Dam, South Africa

Author: Nchabeleng, T ; Cheng, Po-Hsun ; Oberholster, Paul J ; Botha, A-M ; Smit, WJ ; Luus-Powell, WJ Date: Dec 2014 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 to confirm the presence ... Read more
Phytobenthos and phytoplankton community changes upon exposure to a sunflower oil spill in a South African protected freshwater wetland

Author: Oberholster, Paul J ; Blaise, C ; Botha, A-M Date: Aug 2010 The occurrence of a sunflower oil spill in 2007 in the Con Joubert Bird Sanctuary freshwater wetland, South Africa, inhibited the growth of sensitive phytoplankton species and promoted that of tolerant species. The algal divisions Chlorophyta ... Read more
The potential of acidophilic macroalgae as part of passive bioremediation technology for acid mine drainage in constructed wetlands

Author: Cheng, Po-Hsun ; Oberholster, Paul J ; Botha, A-M Date: Oct 2012 The properties of acid mine drainage (AMD) render water resources less habitable to various biota, hence waters that receive AMD are often characterised by very low biodiversity and the flora and fauna become dominated by highly tolerant ... Read more
The potential of selected macroalgal species for treatment of AMD at different pH ranges in temperate regions

Author: Oberholster, Paul J ; Cheng, Po-Hsun ; Botha, A-M ; Genthe, Bettina Date: Sep 2014 The metal bioaccumulation potential of selected macroalgae species at different pH ranges was study for usage as part of a possible secondary passive acid mine drainage (AMD) treatment technology in algae ponds. Two separate studies were ... Read more
Responses of selected biota after biostimulation of a vegetable oil spill in the Con Joubert Bird Sanctuary wetland: a pilot study

Author: Selala, MC ; Oberholster, Paul J ; Surridge, KAK ; De Klerk, Arno R ; Botha, A-M Date: Jan 2013 An investigation on the effect of a vegetable oil spill was conducted on the biological diversity of the Con Joubert Bird Sanctuary wetland in South Africa before and after biostimulation with different concentrations of fertilizer during ... Read more
River catchment responses to anthropogenic acidification in relationship with sewage effluent: An ecotoxicology screening application

Author: Oberholster, Paul J ; Botha, A-M ; Hill, Liesl ; Strydom, Wilma F Date: Dec 2017 Rising environmental pressures on water resources and resource quality associated with urbanisation, industrialisation, mining and agriculture are a global concern. In the current study the upper Olifants River catchment as case study was ... Read more
Using modified multiple phosphorus sensitivity indices for mitigation and management of phosphorus loads on a catchment level

Author: Oberholster, Paul J ; Dabrowski, James M ; Botha, A-M Date: Jan 2013 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 mitigation and ... Read more

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Browsing by Author "Botha, A-M"

Browsing by Author "Botha, A-M"

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