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Browsing by Author "Botha, AM"

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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
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
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
First report on the colony-forming freshwater ciliate Ophrydium versatile in an African river

Author: Oberholster, Paul J ; Ashton, PJ ; Fritz, GB ; Botha, AM Date: Apr 2010 Ophrydium versatile (Müller 1786) Ehrenberg 1830 – a symbiotic ciliate that forms gelatinous colonies – is widely distributed in temperate lakes in Europe and America, but has not previously been recorded from rivers. In this paper we report ... Read more
The impacts of neutralized acid mine drainage contaminated water on the expression of selected endocrine-linked genes in juvenile Mozambique tilapia Oreochromis mossambicus exposed in vivo

Author: Truter, JC ; Van Wyk, JH ; Oberholster, Paul J ; Botha, AM Date: Feb 2014 Acid mine drainage (AMD) is a global environmental concern due to detrimental impacts on river ecosystems. Little is however known regarding the biological impacts of neutralized AMD on aquatic vertebrates despite excessive discharge into ... Read more
Monetary value of the impacts of filamentous green algae on commercial agriculture: Results from two geographically different case studies

Author: De Lange, Willem J ; Botha, AM ; Oberholster, Paul J Date: Jul 2016 This paper presents estimates of the monetary value of the impact of eutrophication (algae) on commercial agriculture in two different catchments in South Africa. A production function approach is applied to estimate the monetary value of the ... Read more
Responses of phytoplankton upon exposure to a mixture of acid mine drainage and high levels of nutrient pollution in Lake Loskop, South Africa.

Author: Oberholster, Paul J ; Myburgh, JG ; Ashton, PJ ; Botha, AM Date: 2009 The relationships between water quality and the phytoplankton community within Lake Loskop were studied during the late summer and autumn of 2008 to evaluate the impacts of acid mine drainage and high nutrient concentrations. The higher ... Read more
Towards tradable permits for filamentous green algae pollution

Author: De Lange, Willem J ; Botha, AM ; Oberholster, Paul J Date: Sep 2016 Water pollution permit systems are challenging to design and implement. Operational systems that has maintained functionality remains few and far between, particularly in developing countries. We present current progress towards developing ... Read more
Treated acid mine drainage and stream recovery: Downstream impacts on benthic macroinvertebrate communities in relation to multispecies toxicity bioassays

Author: Steyn, Maronel ; Oberholster, PJ ; Botha, AM ; Genthe, Bettina ; Van den Heever-Kriek, PE ; Weyers, C Date: Apr 2019 The success and long term effectiveness of extensive and expensive engineering solutions to restore streams impacted by Acid Mine Drainage (AMD) is rarely tested. Concentrations of pollutants were measured in water along a longitudinal gradient ... Read more
Use of remote sensing and molecular markers to detect toxic cyanobacterial hyperscum crust: A case study on Lake Hartbeespoort, South Africa

Author: Oberholster, Paul J ; Botha, AM Date: Dec 2010 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 by a distinctive ... Read more

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Browsing by Author "Botha, AM"

Browsing by Author "Botha, AM"

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