Assessing and planning future estuarine resource use: A scenario-based regional-scale freshwater allocation approach

Niekerk, Lara Van; Adams, Janine B.; Allan, David G.; Taljaard, Susan; Weerts, S P; Louw, D.; Talanda, Colin; Rooyen, P. van

doi:10.1016/j.scitotenv.2018.12.033

Cited by 39 publications

(33 citation statements)

References 35 publications

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“…Since the early 1980s, coastal cities, such as Cape Town, Port Elizabeth, Durban and Richards Bay have experienced rapid economic growth and a demand for urban housing (DEA 2013a). Expanded waste management facilities have exceeded the carrying capacities of treatment facilities resulting in a marked deterioration in water quality of receiving water bodies, such as estuaries (Van Niekerk et al 2019b).…”

Section: Root Causes Of Water Quality Deterioration ('Drivers')mentioning

confidence: 99%

“…Many densely populated coastal settlements are not serviced by reticulated sewage systems. This results in untreated sewage entering stormwater runoff into rivers and estuaries, an occurrence that contributes significantly to nutrient and organic loading through diffuse urban runoff (Van Niekerk et al 2019b). Over fertilisation on crop farms and contaminated runoff from cattle and dairy farms are additional nutrient sources (Pearce and Schumann 2001;Lemley et al 2017).…”

Section: Major Sources Of Nutrient Pollution ('Pressure')mentioning

confidence: 99%

“…Regular sampling indicated the eutrophic and anoxic conditions in highly stratified bottom waters, as a result of inputs from the surrounding dairy farms (Kaselowski and Adams 2013). Input of sewage effluent from WWTWs is a large problem on the developed KwaZulu-Natal coast, where frequently this is the only flow into small estuaries during the low flow season (Van Niekerk et al 2019b). High nutrient inputs from WWTWs (Table 5) have resulted in eutrophic conditions in both the Mhlanga and uMdloti estuaries (Thomas et al 2005).…”

Section: Ecological Consequences ('Impact')mentioning

confidence: 99%

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Nutrient enrichment as a threat to the ecological resilience and health of South African microtidal estuaries

Adams

Taljaard

Niekerk

et al. 2020

African Journal of Aquatic Science

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Journal of Aquatic Science is co-published by NISC (Pty) Ltd and Informa UK Limited (trading as Taylor & Francis Group) water and to the quality of the water concerned' (OSPAR 2003). Eutrophication is characterised by a surge in primary production in response to nutrient loading that results in a loss of submerged aquatic vegetation, oxygen depletion, harmful algal blooms, imbalanced food webs, lower biodiversity, altered biogeochemical cycling and fish-kills (Conley et al. 2009; Ferreira et al. 2011; Lemley and Adams 2019a; Van Niekerk et al. 2019a). Depending on the scale of nutrient enrichment and the type of estuary, these impacts can cause the state of an estuary to change from one dominated by macrophytes to another dominated by phytoplankton and/or macroalgae (Dahlgren and Kautsky 2004; Smith and Schindler 2009; Nunes and Adams 2014; Lemley et al. 2018c). South Africa has a range of estuary types that occur across four biogeographic regions; cool temperate, warm temperate, subtropical and tropical (Whitfield 1992; Van Niekerk et al. 2020). Nutrient enrichment is a serious concern not only in temporarily closed estuaries (e.g. Groot Brak), but also in large permanently open systems

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Section: Root Causes Of Water Quality Deterioration ('Drivers')mentioning

confidence: 99%

Section: Major Sources Of Nutrient Pollution ('Pressure')mentioning

confidence: 99%

Section: Ecological Consequences ('Impact')mentioning

confidence: 99%

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Nutrient enrichment as a threat to the ecological resilience and health of South African microtidal estuaries

Adams

Taljaard

Niekerk

et al. 2020

African Journal of Aquatic Science

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“…Some assessments occurred over several years and so, for the most part, the date used was that of the final report. Methods used were further categorised as: riverine or estuarine ecosystems; low, medium or high‐resolution (WBG, ); hydrological, hydraulic, habitat simulation, holistic or ecosystem‐approach (after Overton et al, ; Tharme, ; Van Niekerk et al, ) and prescriptive or scenario‐based (Acreman, ; Table ).…”

Section: Approachmentioning

confidence: 99%

“…Information on EFlows Assessments was collected using websites managed by the government of each country, international donors (e.g., DFID, USAID, UNDP), international lenders (e.g., WBG, AfDB), conservation and activist organisations (e.g., WWF, IUCN), on-line library facilities, research registers and search engines. Overton et al, 2014;Tharme, 2003;Van Niekerk et al, 2019) and prescriptive or scenario-based (Acreman, 2016;…”

mentioning

confidence: 99%

Status and trends in EFlows in southern Africa

Brown

Campher²,

King

2020

Natural Resources Forum

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Environmental Flows (EFlows) are defined as the quantity, timing and quality of the flow of water, sediment and biota necessary to sustain freshwater and estuarine ecosystems, and the human livelihoods and well‐being that depend on these ecosystems. As such they are a vital component of Integrated Water Resource Management (IWRM). A recent survey found that, in general, Africa lags behind schedule with respect to the global SDG Target 6.5 to implement IWRM at all levels, including through transboundary cooperation as appropriate. This web‐based review explores progress made in EFlows Assessments and implementing their outcomes in southern Africa. It outlines the apparent impetus to the uptake of EFlows provided by legislation, common funding mechanisms for EFlows assessment and evolving trends in EFlows assessment. It also highlights instances of implementation of EFlows in both in‐country and transboundary settings.

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Possible impacts of non-native plant, pathogen, invertebrate and fish taxa on the indigenous ichthyofauna in South African estuaries: a preliminary review

Whitfield

Adams

Harrison³

et al. 2021

Biol Invasions

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Assessing and planning future estuarine resource use: A scenario-based regional-scale freshwater allocation approach

Cited by 39 publications

References 35 publications

Nutrient enrichment as a threat to the ecological resilience and health of South African microtidal estuaries

Nutrient enrichment as a threat to the ecological resilience and health of South African microtidal estuaries

Status and trends in EFlows in southern Africa

Possible impacts of non-native plant, pathogen, invertebrate and fish taxa on the indigenous ichthyofauna in South African estuaries: a preliminary review

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