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Browsing Journal Articles by Author "Oberholster, Paul J"

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Appearance of new taxa: invertebrates, phytoplankton and bacteria in an alkaline, saline, meteorite crater lake, South Africa

Author: Oberholster, Paul J ; Botha, AM ; Ashton, PJ Date: Apr 2009 Data generated during 12 field trips in 2006 were used to investigate possible changes in the biota communities of Lake Tswaing after a borehole was sunk in 1988/1989 near the centre of the crater lake. The Tswaing meteorite crater lake is a ... Read more
Application of multi-method approach to assess groundwater–surface water interactions, for catchment management

Author: Madlala, Tebogo E ; Kanyerere, T ; Oberholster, Paul J ; Xu, Y Date: Jun 2018 Globally, the dependence of river systems to delayed discharge of subsurface water to augment flows during dry seasons is well documented. Discharge of fresh subsurface water can dilute concentrated river flow quality during reduced flow. ... Read more
Applying genotoxicology tools to identify environmental stressors in support of river management

Author: Oberholster, Paul J ; Hill, Liesl ; Jappie, S ; Truter, JC ; Botha, A Date: Sep 2015 Although bioassay approaches are useful for identifying chemicals of potential concern, they provide little understanding of the mechanisms of chemical toxicity. Without this understanding, it is difficult to address some of the key challenges ... Read more
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
Bacteria as biological control agents of freshwater cyanobacteria: is it feasible beyond the laboratory?

Author: Ndlela, Luyanda L ; Oberholster, Paul J ; Van Wyk, JH ; Cheng, Po Hsun H Date: Dec 2018 Biological control of cyanobacteria is a well-researched area with a central focus on laboratory-scale studies. Numerous reports have been made on algicidal isolates, with bacteria as a major component of the antagonists. The research in this ... 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
Development of a diatom-based multimetric index for acid mine drainage impacted depressional wetlands

Author: Riato, L ; Leira, M ; Della Bella, V ; Oberholster, Paul J Date: Jan 2018 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 wetlands for storage ... Read more
Development of a rapid and sensitive battery of bioassays for risk assessment of cyanobacterial microcystin-LR in drinking water of rural water treatment plants, South Africa

Author: Oberholster, Paul J ; Mthethwa, BLS ; Botha, AM Date: Sep 2009 Due to the lack of toxin standards and resource limitations for wide scale use of analytical methods for e.g. high-performance liquid chromatography (HPLC) and enzyme-linked immunosorbent assay (ELISA) in cyanobacterial toxin monitoring, it ... Read more
The development of a wetland classification and risk assessment index (WCRAI) for non-wetland specialists for the management of natural freshwater wetland ecosystems

Author: Oberholster, Paul J ; McMillan, P ; Durgapersad, K ; Botha, AM ; De Klerk, Arno R Date: Feb 2014 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 and rapid assessment ... Read more
A diatom functional-based approach to assess changing environmental conditions in temporary depressional wetlands

Author: Riato, L ; Della Bella, V ; Leira, M ; Taylor, JV ; Oberholster, Paul J Date: Jul 2017 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 depressional wetlands ... Read more
Diatom-based models for inferring water chemistry and hydrology in temporary depressional wetlands

Author: Riato, L ; Leira, M ; Della Bella, V ; Oberholster, Paul J Date: Aug 2017 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 landscapes. Establishing ... Read more
Eco-epidemiological and pathological features of wildlife mortality events related to cyanobacterial biointoxication in the Kruger National Park, South Africa

Author: Bengis, R ; Govender, D ; Lane, E ; Myburgh, J ; Oberholster, Paul J ; Buss, P ; Prozesky, L ; Keet, D Date: Oct 2016 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. On field investigation, ... Read more c b d
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
Effects of engineered nanoparticles on survival, reproduction, and behaviour of freshwater snail, Physa acuta (Draparnaud, 1805)

Author: Musee, N ; Oberholster, Paul J ; Sikhwivhilu, L ; Botha, AM Date: 2010 Increasing uses of engineered nanoparticles (ENPs) in commercial products and industrial applications has eventually resulted to their releases into atmospheric, terrestrial, and aquatic environments. However, knowledge gaps in ENPs toxicity, ... Read more
The environmental feasibility of low-cost algae-based sewage treatment as a climate change adaption measure in rural areas of SADC countries

Author: Oberholster, Paul J ; Cheng, Po-Hsun ; Genthe, Bettina ; Steyn, Maronel Date: Jul 2018 Employing specific algae treatment to treat municipal domestic wastewater effluent presents an alternative practice to improving water quality effluent of existing rural pond systems in Southern Africa. In the present study, domestic wastewater ... Read more
An eutrophication index for lowland sandy rivers in Mediterranean coastal climatic regions of Southern Africa

Author: Oberholster, Paul J ; Madlala, Tebogo E ; Blettler, MCM ; Amsler, ML ; Eberle, EG ; Botha, A Date: Mar 2018 The eutrophication of waterways has become an endemic global problem. Nutrient enrichment from agriculture activities and waste water treatment plants are major drivers, but it remains unclear how lowland sandy rivers respond to eutrophication. ... Read more
Evaluation of a low cost technology to manage algal toxins in rural water supplies

Author: Pindihama, GK ; Gumbo, JR ; Oberholster, Paul J Date: Dec 2011 South Africa is a water scarce country with freshwater resources that are deteriorating mostly due to anthropogenic activities. Several dams in South Africa are eutrophic and present potential health risks to water consumers and users. ... 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
Fate, transport and effects of pollutants originating from acid mine drainage in the Olifants River, South Africa

Author: Dabrowski, JM ; Dabrowski, James M ; Hill, Liesl ; Macmillan, P ; Oberholster, Paul J Date: Aug 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 acid mine drainage (AMD) from the Klipspruit River. The ... Read more
First report of an Anabaena Bory strain containing microcystin-LR in a freshwater body in Africa

Author: Oberholster, Paul J ; Jappie, S ; Cheng, Po-Hsun ; Botha, AM ; Matthews, MW Date: 11 Mar 2015 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 on 10 occasions. The ... Read more

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