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Browsing by Author "Adams, JB"

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Advancing ecosystem accounting in estuaries: Swartkops Estuary case study

Author: Taljaard, Susan ; Van Niekerk, Lara ; Adams, JB ; Riddin, T Date: Mar 2023 Rapid degradation of ecosystems and loss of ecosystem services have sparked interest in developing approaches to report and integrate such change with socio-economic information systems, such as the System of National Accounts. Here we describe ... Read more
Advancing mouth management practices in the Groot Brak Estuary, South Africa

Author: Van Niekerk, Lara ; Adams, JB ; Taljaard, Susan ; Huizinga, Piet ; Lamberth, S Date: Feb 2020 The early 1990s in South Africa were characterised by a strongly hierarchical and technocratic regime where planning and development decisions regarding the environment were made at national government level with little or no public consultation ... Read more
Advancing the science of environmental flow management for protection of temporarily closed estuaries and coastal lagoons

Author: Stein, ED ; Gee, EM ; Adams, JB ; Irving, K ; Van Niekerk, Lara Date: Feb 2021 The science needed to inform management of environmental flows to temporarily closed estuaries and coastal lagoons is decades behind the state of knowledge for rivers and large embayments. These globally ubiquitous small systems, which are ... Read more
Assessing and planning future estuarine resource use: A scenario-based regional-scale freshwater allocation approach

Author: Van Niekerk, Lara ; Adams, JB ; Allan, DG ; Taljaard, Susan ; Weerts, Steven P ; Louw, D ; Talanda, C ; Van Rooyen, P Date: Mar 2019 Rapid urbanisation and industrial growth in South Africa increases the need for proactive allocation of freshwater resources on a regional scale. A nine-step method is described that sets long-term targets for water resource condition and ... Read more
Assessment of the conservation priority status of South African estuaries for use in management and water allocation

Author: Turpie, JK ; Adams, JB ; Joubert, A ; Harrison, TD ; Colloty, BM ; Maree, RC ; Whitfield, AK ; Wooldridge, TH ; Lamberth, SJ ; Taljaard, Susan ; Van Niekerk, Lara Date: Apr 2002 The future health and productivity of South Africa's approximately 250 estuaries is dependent on two main factors; management and freshwater inputs. Both management and water allocation decisions involve trade-offs between conservation and ... Read more
Blue carbon sinks in South Africa and the need for restoration to enhance carbon sequestration

Author: Raw, JL ; Van Niekerk, Lara ; Chauke, O ; Riddin, T ; Adams, JB Date: Feb 2023 Blue carbon ecosystems (mangroves, salt marshes, and seagrasses) contribute towards climate change mitigation because they are efficient at sequestering atmospheric CO2 into long-term total ecosystem carbon stocks. Destruction or disturbance ... 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
Characteristics and landcover of estuarine boundaries: implications for the delineation of the South African estuarine functional zone

Author: Veldkornet, DA ; Adams, JB ; Van Niekerk, Lara Date: Nov 2015 This study investigated whether the current lateral boundary for estuaries in South Africa, i.e. the estuarine functional zone (EFZ), includes all estuarine habitats. The EFZ covers 173 930 ha in 304 estuaries/outlets nationally. Field surveys ... 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
Country-wide assessment of estuary health: An approach for integrating pressures and ecosystem response in a data limited environment

Author: Van Niekerk, Lara ; Adams, JB ; Bate, GC ; Forbes, AT ; Forbes, NT ; Huizinga, P ; Lamberth, SJ ; MacKay, CF ; Petersen, C ; Taljaard, Susan ; Weerts, Steven P ; Whitfield, AK ; Wooldridge, TH Date: Sep 2013 Population and development pressures increase the need for proactive strategic management on a regional or country-wide scale - reactively protecting ecosystems on an estuary-by-estuary basis against multiple pressures is ‘resource hungry’ ... Read more
Disaggregation and assessment of estuarine pressures at the country-level to better inform management and resource protection – the South African experience

Author: Van Niekerk, Lara ; Taljaard, Susan ; Lamberth, SJ ; Adams, JB ; Weerts, Steven P ; MacKay, CF Date: May 2022 Globally, the ability of estuaries to sustain functionality and productivity is deteriorating rapidly under ever-increasing anthropogenic pressures. We present a systematic approach to identify, characterise and rank global pressures affecting ... Read more
Dispersal and coastal geomorphology limit potential for mangrove range expansion under climate change

Author: Raw, JL ; Van der Stocken, T ; Carroll, D ; Harris, LR ; Rajkaran, A ; Van Niekerk, Lara ; Adams, JB Date: Nov 2022 Latitudinal range limits for mangroves on high-energy, wave-dominated coasts are controlled by geomorphological features and estuarine dynamics. Mangroves reach a southern global range limit along the South African coastline, but the distribution ... Read more
Drivers of mangrove distribution at the high-energy, wave-dominated, southern African range limit

Author: Raw, JL ; Godbold, JA ; Van Niekerk, Lara ; Adams, JB Date: Oct 2019 Mangrove distribution patterns at regional scales are influenced by additional factors besides temperature and rainfall regimes. This study identified abiotic drivers of mangrove area cover along the high-energy, wave-dominated coastline of ... Read more
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
An environmental flow determination method for integrating multiple-scale ecohydrological and complex ecosystem processes in estuaries

Author: Van Niekerk, Lara ; Taljaard, Susan ; Adams, JB ; Lamberth, SJ ; Huizinga, P ; Turpie, JK ; Wooldridge, TH Date: Mar 2019 This paper presents an environmental flow methodology that was developed to accommodate shallow, highly dynamic micro-tidal estuaries found along the wave-dominated coast of South Arica. This method differs to most other approaches that ... Read more
An Estuary Ecosystem Classification that encompasses biogeography and a high diversity of types in support of protection and management

Author: Van Niekerk, Lara ; Adams, JB ; James, NC ; Lamberth, SJ ; MacKay, CF ; Turpie, JK ; Rajkaran, A ; Weerts, Steven P ; Whitfield, AK Date: Mar 2020 For nearly three decades, the Whitfield (1992) characterisation scheme served as a reference framework to type South African estuaries. We outline a revised ecosystem classification scheme that incorporates biogeographical zonation and ... Read more
High flow variability and storm events shape the ecology of the Mbhashe Estuary, South Africa

Author: James, NC ; Adams, JB ; Connell, AD ; Lamberth, SJ ; MacKay, CF ; Snow, GC ; Van Niekerk, Lara ; Whitfield, AK Date: Mar 2020 The possible impacts of extreme events on the ecology of selected aquatic biota within the Mbhashe Estuary were investigated during a four year (2010–2013) spring sampling programme. During periods of low to average flow conditions the estuary ... 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
The influence of mouth status on pH variability in small temporarily closed estuaries

Author: Omarjee, Aadila ; Taljaard, Susan ; Weerts, Steven P ; Adams, JB Date: Nov 2020 Land-based nutrient enrichment of estuarine waters is emerging as a major factor influencing pH and has been referred to as “the other eutrophication problem”. Small temporarily closed estuaries with high residence times are likely to be ... 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

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