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Browsing by Subject "Eutrophication"

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An algorithm for detecting trophic status (chlorophyll-a), cyanobacterial-dominance, surface scums and floating vegetation in inland and coastal waters

Author: Matthews, MW ; Bernard, Stewart ; Robertson, L Date: Sep 2012 A 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
Application of Sentinel 3 OLCI for chl-a retrieval over small inland water targets: Successes and challenges

Author: Kravitz, J ; Matthews, M ; Bernard, Stewart ; Griffith, Derek J Date: Feb 2020 Eutrophication 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
Applying SWAT to predict ortho-phosphate loads and trophic status in four reservoirs in the upper Olifants catchment, South Africa

Author: Dabrowski, James M Date: Jul 2014 Excessive 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
Biophysical modelling of phytoplankton communities from first principles using two-layered spheres: Equivalent Algal Populations (EAP) model

Author: Robertson Lain, L ; Bernard, Stewart ; Evers-King, H Date: Jul 2014 There 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
Changes in invasive alien aquatic plants in a small closed estuary

Author: Nunes, M ; Adams, JB ; Van Niekerk, Lara Date: Sep 2020 Invasive 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
Comparative assessment of two agriculturally-influenced estuaries

Author: Lemley, DA ; Adams, JB ; Taljaard, Susan Date: Apr 2017 This 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
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
Effective management of closed hypereutrophic estuaries requires catchment-scale interventions

Author: Lemley, DA ; Lamberth, SJ ; Manuel, W ; Nunes, M ; Rishworth, GM ; Van Niekerk, Lara ; Adams, JB Date: Jun 2021 Increased 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
Eutrophication levels of some South African impoundments III. Roodeplaat Dam

Author: Steyn, DJ ; Toerien, DF ; Visser, JH Date: Jan 1976 Algal 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
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
Ineffective artificial mouth-breaching practices and altered hydrology confound eutrophic symptoms in a temporarily closed estuary

Author: Nel, M ; Adams, JB ; Human, LRD ; Nunes, M ; Van Niekerk, Lara ; Lemley, DA Date: Dec 2023 Context: Artificial breaching of intermittently closed estuaries has become more frequent in the face of global-change pressures. Aims: This study aimed to determine whether the ecological health of the Great Brak Estuary has been affected ... Read more
Inorganic nutrient removal efficiency of a constructed wetland before discharging into an urban eutrophic estuary

Author: Lemley, D ; Lekane, CP ; Taljaard, Susan ; Adams, JB Date: Jun 2022 This 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
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
Nutrient characterisation of river inflow into the estuaries of the Gouritz Water Management Area, South Africa

Author: Lemley, DA ; Taljaard, Susan ; Adams, JB ; Strydom, N Date: Oct 2014 This 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
Nutrient enrichment as a threat to the ecological resilience and health of South African microtidal estuaries

Author: Adams, JB ; Taljaard, Susan ; Van Niekerk, Lara ; Lemley, DA Date: Feb 2020 Nutrient 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
Optical detectors for integration into a low cost radiometric device for in-water applications: A feasibility study

Author: Ramkilowan, A ; Chetty, N ; Lysko, M ; Griffith, D Date: Apr 2013 Higher 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
Potential for high fidelity global mapping of common inland water quality products at high spatial and temporal resolutions based on a synthetic data and machine learning approach

Author: Kravitz, J ; Matthews, M ; Lain, L ; Fawcett, S ; Bernard, Stewart Date: Mar 2021 There 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
Response of microphytobenthos to flow and trophic variation in two South African temporarily open/closed estuaries

Author: Perissinotto, R ; Iyer, K ; Nozais, C Date: 2006 Variations 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
Study to determine if prevention is better than cure

Author: Oelofse, Suzanna HH Date: Aug 2009 CSIR 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
Towards the classification of eutrophic condition in estuaries

Author: Lemley, DA ; Adams, JA ; Taljaard, Susan ; Strydom, NA Date: Oct 2015 Water 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

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