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:Kravitz, J; Matthews, M; Bernard, Stewart; Griffith, Derek JDate:Feb 2020Eutrophication and increasing prevalence of potentially toxic cyanobacterial blooms among global inland water bodies is becoming a major concern and requires direct attention. The European Space Agency recently launched the Ocean and Land ...Read more
Author:Dabrowski, James MDate:Jul 2014Excessive phosphate loading in the upper Olifants River, South Africa has resulted in widespread eutrophication and associated ecosystem health impacts. The majority of sewage treatment works (STWs) are operating poorly and are likely an ...Read more
Author:Robertson Lain, L; Bernard, Stewart; Evers-King, HDate:Jul 2014There is a pressing need for improved bio-optical models of high biomass waters as eutrophication of coastal and inland waters becomes an increasing problem. Seasonal boom conditions in the Southern Benguela and persistent harmful algal ...Read more
Author:Nunes, M; Adams, JB; Van Niekerk, LaraDate:Sep 2020Invasive alien aquatic plants (IAAPs) are rapidly spreading in South African estuaries because of anthropogenic nutrient loading and persistent freshwater conditions. This study investigated changes in IAAP cover in relation to development ...Read more
Author:Lemley, DA; Adams, JB; Taljaard, SusanDate:Apr 2017This study compared the spatio-temporal dynamics in two agriculturally-influenced South African estuaries - Gamtoos and Sundays - to investigate how contrasting hydrological alterations influence physical, chemical and biological responses. ...Read more
Author:Bengis, R; Govender, D; Lane, E; Myburgh, J; Oberholster, Paul J; Buss, P; Prozesky, L; Keet, DDate:Oct 2016Over 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 morecbd
Author:Lemley, DA; Lamberth, SJ; Manuel, W; Nunes, M; Rishworth, GM; Van Niekerk, Lara; Adams, JBDate:Jun 2021Increased nutrient loading associated with rapid population growth is the leading cause of deteriorating water quality in urbanized estuaries globally. Small estuaries are particularly sensitive to changes when connection with the marine ...Read more
Author:Steyn, DJ; Toerien, DF; Visser, JHDate:Jan 1976Algal bioassays indicated that the waters of Roodeplaat dam are severely eutrophied since algal growth potentials (AGP) of up to 200 mg/l and batch culture algal growth rate of up to 2,2 d were registered with selemastrm capricornutum as test ...Read more
Author:Oberholster, Paul J; Myburgh, JG; Govender, D; Bengis, R; Botha, A-MDate:2009The 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
Author:Lemley, D; Lekane, CP; Taljaard, Susan; Adams, JBDate:Jun 2022This study investigated the nutrient removal efficiency of a constructed wetland (CW) piloted to treat urban runoff before entering an estuary. Physico-chemical, dissolved inorganic nutrient (DIN and DIP), and stormwater inflow volume data ...Read more
Author:Oberholster, Paul J; Botha, A-M; Myburgh, JGDate:Nov 2009The 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
Author:Lemley, DA; Taljaard, Susan; Adams, JB; Strydom, NDate:Oct 2014This study provides an overview of the nutrient status of river inflow into the estuaries within the Gouritz Water Management Area (WMA) of South Africa. Riverine inputs are a major source of macronutrients to estuaries and the adjacent coastal ...Read more
Author:Adams, JB; Taljaard, Susan; Van Niekerk, Lara; Lemley, DADate:Feb 2020Nutrient pollution in South African estuaries is described using a Driver-Pressure-State-Impact-Response framework. The root cause (‘driver’) of deteriorating water quality is rapid population growth that leads to increasing inputs from ...Read more
Author:Ramkilowan, A; Chetty, N; Lysko, M; Griffith, DDate:Apr 2013Higher water temperatures and nutrient loads, along with forecasted climate changes are expected to result in an increase in the frequency and intensity of eutrophication-linked algal blooms (Bernard, 2010, unpublished). The destructive impact ...Read more
Author:Kravitz, J; Matthews, M; Lain, L; Fawcett, S; Bernard, StewartDate:Mar 2021There is currently a scarcity of paired in-situ aquatic optical and biogeophysical data for productive inland waters, which critically hinders our capacity to develop and validate robust retrieval models for Earth Observation applications. ...Read more
Author:Perissinotto, R; Iyer, K; Nozais, CDate:2006Variations in microphytobenthic biomass were investigated in relation to major environmental factors in the Mdloti and Mhlanga temporarily open/closed estuaries (TOCEs), South Africa, from March 2002 to March 2003. Both estuaries receive ...Read more
Author:Oelofse, Suzanna HHDate:Aug 2009CSIR researchers have been commissioned to investigate the costs associated with measures to control pollution at source and those required to treat the consequences associated with polluted water for four of the most important water quality ...Read more
Author:Lemley, DA; Adams, JA; Taljaard, Susan; Strydom, NADate:Oct 2015Water quality and ecological integrity of estuaries closely reflect activities within the entire upstream catchment. Much emphasis has been placed on the response of estuaries to anthropogenic stressors through the use of monitoring programmes. ...Read more
Author:Oberholster, Paul J; Dabrowski, James M; Botha, A-MDate:Jan 2013The 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