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Browsing by Author "Weerts, Steven P"

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Adapting environmental management systems for African ports

Author: Arabi, Sumaiya ; Taljaard, Susan ; Weerts, Steven P Date: Mar 2022 Globally sustainable environmental practices in ports have been linked to socio-economic benefits. While African ports are increasingly acknowledging environmental issues and starting to address these in environmental policy, many are still ... 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
Case studies of modified South African estuaries and implications for ecological restoration in these systems

Author: Weerts, Steven P ; MacKay, F ; Taljaard, Susan ; Van Niekerk, Lara Date: Sep 2019 Presentation on the case studies of modified South African estuaries and implications for ecological restoration in these systems. Read more
Connectivity amongst marine, estuarine and freshwater systems and its implications for estuarine fish communities

Author: Weerts, Steven P Date: Oct 2019 This presentation is about the connectivity amongst marine, estuarine and freshwater systems and its implications for estuarine fish communities. 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
Estuarine lakes: linkages and lineages across longitudes in the Western Indian Ocean

Author: Mackay, F ; Weerts, Steven P ; Gouws, G ; Maduna, S Date: Oct 2017 Recent observations (1) of purported South African endemic species from south east Madagascar prompted the “Suitcase” programme, supported by the African Coelacanth Ecosystem Programme (ACEP), to investigate regional genetic connectivity of ... 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
Global distribution of forest gaps in mangroves: A review

Author: Agyekum, MK ; Zimmer, M ; Weerts, Steven P ; Helfer, V Date: Jul 2019 Forest gaps have been observed in tropical and sub-tropical mangrove ecosystems across the globe, including Panama, Papua New Guinea, the Dominican Republic, Australia, Florida, Malaysia, and French Guiana. However, no comprehensive survey ... Read more
Global occurrence of anti-infectives in contaminated surface waters: Impact of income inequality between countries

Author: Segura, PE ; Takada, H ; Correa, JA ; Saadi, KE ; Koike, T ; Onwona-Agyeman, S ; Ofosu-Anim, J ; Sabi, EB ; Wasonga, OV ; Mghalu, JM ; Dos Santos Junior, AM ; Newman, Brent K ; Weerts, Steven P ; Yargeau, V Date: Jul 2015 The presence anti-infectives in environmental waters is of interest because of their potential role in the dissemination of anti-infective resistance in bacteria and other harmful effects on non-target species such as algae and shellfish. ... 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
The larval developmental stages of Pagellus natalensis in the nearshore waters of KwaZulu-Natal, South Africa

Author: Mabotja, M ; Harris, S ; Weerts, Steven P ; Vivier, L Date: Jan 2022 Presentation on the evaluation of plastic waste in the Durban Bay: concept design based on WILDOCEANS Blue Port project findings. Objectives of this study is to identify routes of entry of different plastic wastes into the port, their likely ... Read more
Larval fish biodiversity in relation to biozones off the KwaZulu-Natal Coast: Biodiversity surrogates for marine conservation planning

Author: Mabotja, Makolobe M ; Harris, S ; Weerts, Steven P Date: Jul 2019 Aims of the study is to examine larval fish assemblages over reef and sand substrates of pre-identified biozones. Investigate possible physico-chemical variables responsible for the larval fish distributions. Test if the identified biozones ... Read more
Larval fish biodiversity in relation to biozones off the KwaZulu-Natal Coast: Biodiversity surrogates for marine pelagic conservation planning

Author: Mabotja, MM ; Harris, S ; Weerts, Steven P Date: Jul 2017 Aims of the study is to understand spatial dynamics of larval fish assemblages in the KZN coastal marine environment (40-80m depths). Examine larval fish composition, abundance and distribution between different substrates (reef and sand) and ... Read more
The legal landscape governing South Africa’s coastal marine environment – Helping with the ‘horrendogram’

Author: Van Niekerk, Lara ; Weerts, Steven P ; Taljaard, Susan Date: Aug 2019 In 1994 South Africa adopted a power-sharing democracy as basis for its political system, and this pluralistic slant also is evident in post-1994 environmental legislation, including that pertaining to the coastal marine environment. ... Read more
Marine outfalls monitoring at the CSIR: Evaluating the impact of wastewater discharge on our marine environment

Author: Arabi, Sumaiya ; Newman, Brent K ; Weerts, Steven P Date: Oct 2012 The impact of wastewater discharge on the marine environment requires careful monitoring. The CSIR’s Marine Outfalls Monitoring Programme has a history of 45 years, and continues to build capacity in the field of marine pollution research ... Read more
Mesozooplankton of the Kosi Bay lakes, South Africa

Author: Jerling, HL ; Weerts, Steven P Date: Mar 2018 The Kosi coastal lake system, a chain of four interconnected basins, is located in the subtropical north-eastern corner of South Africa. Little information is available on zooplankton of the system and the main aim of this study is to report ... Read more
National Wetland Map 5: An improved spatial extent and representation of inland aquatic and estuarine ecosystems in South Africa

Author: Van Deventer, Heidi ; Van Niekerk, Lara ; Adams, J ; Dinala, MK ; Gangat, R ; Lamberth, SJ ; Lotter, M ; Mbona, N ; MacKay, F ; Nel, JL ; Ramjukadh, CL ; Skowno, A ; Weerts, Steven P Date: Jan 2020 The improved representation of freshwater and estuarine ecosystems and associated data was a key component of the 2018 National Biodiversity Assessment, and is an essential step in enhancing defensible land use planning and decision making. ... Read more
The natural environment in port development: A ‘green handbrake’ or an equal partner?

Author: Taljaard, Susan ; Slinger, JH ; Arabi, Sumaiya ; Weerts, Steven P ; Vreugdenhil, H Date: Oct 2020 Rapid urbanization of the coast, growing global trade, stakeholder emancipation and ongoing depletion of natural resources mean that ports can no longer operate and develop without acknowledging and incorporating societal and environmental ... Read more
The potential for a fish ladder to mitigate against the loss of marine-estuarine-freshwater connectivity in a subtropical coastal lake

Author: Weerts, Steven P ; MacKay, CF ; Cyrus, DP Date: Jan 2014 Increasing water demand in coastal regions has resulted in the construction of weirs and barrages in coastal freshwaters. These form barriers to migrations of estuarine and euryhaline marine fishes and crustaceans. This study assessed the ... Read more

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