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

dc.contributor.advisorBolton, John Jen_ZA
dc.contributor.authorHawley, Greeren_ZA
dc.date.accessioned2017-11-07T09:57:41Z
dc.date.available2017-11-07T09:57:41Z
dc.date.issued1999en_ZA
dc.date.updated2017-02-22T12:36:28Z
dc.description.abstractEstuarine 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.identifier.apacitationHawley, 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/11427/26027en_ZA
dc.identifier.chicagocitationHawley, 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/11427/26027en_ZA
dc.identifier.citationHawley, 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.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
dc.identifier.urihttp://hdl.handle.net/11427/26027
dc.identifier.vancouvercitationHawley 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/11427/26027en_ZA
dc.language.isoengen_ZA
dc.publisher.departmentDepartment of Biological Sciencesen_ZA
dc.publisher.facultyFaculty of Scienceen_ZA
dc.publisher.institutionUniversity of Cape Town
dc.subject.otherBotanyen_ZA
dc.titleDiatoms : indicators of tidal influx in a hydraulically regulated estuary, Zandvlei, in the southern Capeen_ZA
dc.typeBachelor Thesis
dc.type.qualificationlevelHonours
dc.type.qualificationnameBSc (Hons)en_ZA
uct.type.filetype
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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