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Browsing by Author "Lemley, DA"

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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
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
A glimpse into the littoral nutrient dynamics of a lake system connected to the sea

Author: Taljaard, Susan ; Van Niekerk, Lara ; Lemley, DA Date: Jan 2018 In South Africa more than 80% of estuaries are small, dynamic and predominantly linear systems. Nutrient characteristics in these systems are mostly influenced by external catchment processes, except during extended periods of closure. However, ... 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
A method to quantify water quality change in data-limited estuaries

Author: Taljaard, Susan ; Lemley, DA ; Van Niekerk, Lara Date: Aug 2022 Situated at the land-sea interface, estuaries are susceptible to land- and sea-based sources of pollution. Despite growing scientific evidence of deterioration in water quality, quantitative methods to translate such information in support ... 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
Possible impacts of non-native plant, pathogen, invertebrate and fish taxa on the indigenous ichthyofauna in South African estuaries: A preliminary review

Author: Whitfield, AK ; Adams, JB ; Harrison, TD ; Lamberth, SJ ; Lemley, DA ; Mackay, F ; Van Niekerk, Lara ; Weyl, Olf Date: Apr 2021 We review the possible impacts of non-native biota on the indigenous fishes of South African estuaries, including macrophytes, algae, pathogens, invertebrates, and fishes. Freshwater macrophytes are one of the primary non-native groups in the ... 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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Browsing by Author "Lemley, DA"

Browsing by Author "Lemley, DA"

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All of ResearchSpace

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