Investigating the Aquatic weeds on the Westlake Wetland: Detrimental effects and management options

 

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dc.contributor.advisor Bolton, John J en_ZA
dc.contributor.advisor Day, John A en_ZA
dc.contributor.author Archibald, Sally en_ZA
dc.date.accessioned 2017-05-24T07:08:50Z
dc.date.available 2017-05-24T07:08:50Z
dc.date.issued 1998 en_ZA
dc.identifier.citation Archibald, S. 1998. Investigating the Aquatic weeds on the Westlake Wetland: Detrimental effects and management options. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/24395
dc.description.abstract The aquatic weeds on the Westlake wetland at Zandvlei (Cape Town, South Africa) were investigated in terms of their detrimental effects, and the biotic and abiotic conditions associated with their nuisance growth. Eichhornia crassipes was the most problematic of the weeds, both from a human perspective and in its effect on the system, and it appears to out-compete the initially more abundant Ceratophyllum demersum and Azolla filiculoides after disturbances such as clearing and flooding. Temperature, current strength and inter-species interactions were controlling the distribution and growth of the weeds on a seasonal scale, but over the long term it is likely that lower salinities, together with high concentrations of nitrogen and phosphorus, have caused the increased growth noticeable over the last fifteen years. The present management programme of annual mechanical clearance seems to be the most cost-efficient, ecosystem-friendly option but it is suggested that the possibility of increasing the salinity in the wetland be investigated as a way of slowing the regrowth of the weeds after clearance. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Botany en_ZA
dc.title Investigating the Aquatic weeds on the Westlake Wetland: Detrimental effects and management options en_ZA
dc.type Bachelor Thesis
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 Text
uct.type.filetype Image
dc.identifier.apacitation Archibald, S. (1998). <i>Investigating the Aquatic weeds on the Westlake Wetland: Detrimental effects and management options</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/24395 en_ZA
dc.identifier.chicagocitation Archibald, Sally. <i>"Investigating the Aquatic weeds on the Westlake Wetland: Detrimental effects and management options."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1998. http://hdl.handle.net/11427/24395 en_ZA
dc.identifier.vancouvercitation Archibald S. Investigating the Aquatic weeds on the Westlake Wetland: Detrimental effects and management options. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1998 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/24395 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Archibald, Sally AB - The aquatic weeds on the Westlake wetland at Zandvlei (Cape Town, South Africa) were investigated in terms of their detrimental effects, and the biotic and abiotic conditions associated with their nuisance growth. Eichhornia crassipes was the most problematic of the weeds, both from a human perspective and in its effect on the system, and it appears to out-compete the initially more abundant Ceratophyllum demersum and Azolla filiculoides after disturbances such as clearing and flooding. Temperature, current strength and inter-species interactions were controlling the distribution and growth of the weeds on a seasonal scale, but over the long term it is likely that lower salinities, together with high concentrations of nitrogen and phosphorus, have caused the increased growth noticeable over the last fifteen years. The present management programme of annual mechanical clearance seems to be the most cost-efficient, ecosystem-friendly option but it is suggested that the possibility of increasing the salinity in the wetland be investigated as a way of slowing the regrowth of the weeds after clearance. DA - 1998 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1998 T1 - Investigating the Aquatic weeds on the Westlake Wetland: Detrimental effects and management options TI - Investigating the Aquatic weeds on the Westlake Wetland: Detrimental effects and management options UR - http://hdl.handle.net/11427/24395 ER - en_ZA


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