Diatoms : indicators of tidal influx in a hydraulically regulated estuary, Zandvlei, in the southern Cape

 

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dc.contributor.advisor Bolton, John J en_ZA
dc.contributor.author Hawley, Greer en_ZA
dc.date.accessioned 2017-11-07T09:57:41Z
dc.date.available 2017-11-07T09:57:41Z
dc.date.issued 1999 en_ZA
dc.identifier.citation Hawley, G. 1999. Diatoms : indicators of tidal influx in a hydraulically regulated estuary, Zandvlei, in the southern Cape. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/26027
dc.description.abstract Estuarine systems are characterised by relatively high levels of salinity due to their connection with the sea. Zandvlei has been victim too much manipulation for the sake of flood prevention, recreation and water level regulation. One of the largest impacts on the system is the rubble weir placed at the mouth of the outlet channel that was built to maintain water levels in the drier summer months. There is evidence that the salinity in the estuary is declining, as the weir inhibits sufficient tidal ingress. Resultant consequences include encouraging the growth of alien invasive weeds, the decline of indigenous aquatic fauna and flora, and a shift in ecosystem functioning. Plans to increase the circulation of seawater have already been proved to be necessary, but the process needs to be monitored. Diatoms are used regularly in Europe to monitor water quality in terms of eutrophication and pollution. This study attempts to describe the change in diatom composition after the mouth has been manually opened, in terms of the influencing factors, namely salinity and temperature. The species response was found to be a shift in species dominance rather than a species turnover. Key indicator species were distinguished by the response to salinity. Diatoms can also be informative of the stability of the Vlei and therefore act as a valuable tool for monitoring purposes. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Botany en_ZA
dc.title Diatoms : indicators of tidal influx in a hydraulically regulated estuary, Zandvlei, in the southern Cape en_ZA
dc.type Bachelor Thesis
dc.date.updated 2017-02-22T12:36:28Z
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Biological Sciences en_ZA
dc.type.qualificationlevel Honours
dc.type.qualificationname BSc (Hons) en_ZA
uct.type.filetype
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Hawley, G. (1999). <i>Diatoms : indicators of tidal influx in a hydraulically regulated estuary, Zandvlei, in the southern Cape</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/26027 en_ZA
dc.identifier.chicagocitation Hawley, Greer. <i>"Diatoms : indicators of tidal influx in a hydraulically regulated estuary, Zandvlei, in the southern Cape."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1999. http://hdl.handle.net/11427/26027 en_ZA
dc.identifier.vancouvercitation Hawley G. Diatoms : indicators of tidal influx in a hydraulically regulated estuary, Zandvlei, in the southern Cape. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1999 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/26027 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Hawley, Greer AB - Estuarine systems are characterised by relatively high levels of salinity due to their connection with the sea. Zandvlei has been victim too much manipulation for the sake of flood prevention, recreation and water level regulation. One of the largest impacts on the system is the rubble weir placed at the mouth of the outlet channel that was built to maintain water levels in the drier summer months. There is evidence that the salinity in the estuary is declining, as the weir inhibits sufficient tidal ingress. Resultant consequences include encouraging the growth of alien invasive weeds, the decline of indigenous aquatic fauna and flora, and a shift in ecosystem functioning. Plans to increase the circulation of seawater have already been proved to be necessary, but the process needs to be monitored. Diatoms are used regularly in Europe to monitor water quality in terms of eutrophication and pollution. This study attempts to describe the change in diatom composition after the mouth has been manually opened, in terms of the influencing factors, namely salinity and temperature. The species response was found to be a shift in species dominance rather than a species turnover. Key indicator species were distinguished by the response to salinity. Diatoms can also be informative of the stability of the Vlei and therefore act as a valuable tool for monitoring purposes. DA - 1999 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1999 T1 - Diatoms : indicators of tidal influx in a hydraulically regulated estuary, Zandvlei, in the southern Cape TI - Diatoms : indicators of tidal influx in a hydraulically regulated estuary, Zandvlei, in the southern Cape UR - http://hdl.handle.net/11427/26027 ER - en_ZA


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