Author:Matthews, MW; Bernard, Stewart; Robertson, LDate:Sep 2012A novel algorithm is presented for detecting trophic status (chlorophyll-a), cyanobacterial blooms (cyano-blooms), surface scum and floating vegetation in coastal and inland waters using top-ofatmosphere data from the Medium Resolution Imaging ...Read more
Author:Ndlela, Luyanda L; Oberholster, Paul J; Van Wyk, JohannesDate:Aug 2017With the effects of climate change, harmful algal blooms (HABs) have become a global concern, with serious implications in water scarce countries and vulnerable continents such as Africa. A need exists for low-cost, environmentally feasible ...Read more
Author:Matthews, MW; Bernard, Stewart; Evers-King, H; Robertson Lain, LDate:Oct 2020A hyperspectral inversion algorithm was used to distinguish between cyanobacteria and algal blooms in optically complex inland waters. A framework for the algorithm is presented that incorporates a bio-optical model, a solution for the radiative ...Read more
Author:Nchabeleng, T; Cheng, Po-Hsun; Oberholster, Paul J; Botha, A-M; Smit, WJ; Luus-Powell, WJDate:Dec 2014The 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
Author:Ndlela, Luyanda L; Oberholster, Paul J; Van Wyk, JH; Cheng, Po-HsunDate:Dec 2016Cyanobacterial blooms are a current cause for concern globally, with vital water sources experiencing frequent and increasingly toxic blooms in the past decade. These increases are resultant of both anthropogenic and natural factors, with ...Read more
Author:Oberholster, Paul J; Blaise, C; Botha, A-MDate:Aug 2010The 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
Author:Magonono, M; Oberholster, Paul J; Addmore, S; Stanley, M; Gumbo, JRDate:Jul 2018The presence of harmful algal blooms (HABs) and cyanotoxins in drinking water sources poses a great threat to human health. The current study employed molecular techniques to determine the occurrence of non-toxic and toxic cyanobacteria species ...Read more
Author:Oberholster, Paul J; Myburgh, JG; Ashton, PJ; Botha, AMDate:2009The 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
Author:Oberholster, Paul J; Botha, AMDate:Dec 2010In 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