Phytoplankton production studies in the coastal waters off the Cape Peninsula, South Africa

 

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dc.contributor.advisor Field, John G en_ZA
dc.contributor.advisor Hay, C en_ZA
dc.contributor.author Brown, Penelope Cranstoun en_ZA
dc.date.accessioned 2016-03-09T09:07:27Z
dc.date.available 2016-03-09T09:07:27Z
dc.date.issued 1980 en_ZA
dc.identifier.citation Brown, P. 1980. Phytoplankton production studies in the coastal waters off the Cape Peninsula, South Africa. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/17605
dc.description Bibliography: pages 85-95. en_ZA
dc.description.abstract Procedures for measuring phytoplankton production in the southern Benguela upwelling region were investigated. A 125 ml incubation bottle is recommended for routine primary production measurements. Exposure of production samples to high light intensities during manipulations on deck was found to inhibit rates of production near the bottom of the euphotic zone particularly below a thermocline. Simulated in situ rates of oxygen production were only slightly higher than in situ rates. When ships time is limited, the simulated in situ method can safely be used in local waters. Definite diel periodicity in rates of production at the sea surface was demonstrated and appears to be linked to light levels and nutrient concentrations, as well as to the ratios of light to dark hours. Since diel variation probably decreases with depth, its effect on integrated daily production is reduced. Nevertheless, the time of incubation should be chosen to minimize the effect of periodicity on daily production estimates. The period spanning noon is recommended for local use. Changes in phytoplankton production and biomass are linked with physical and chemical changes in the upwelling system off the Cape Peninsula. Extremely active upwelling was found to limit primary production and from these measurements the annual net primary production in the Cape Peninsula upwelling region is estimated for the first time to be approximately 1.13 kgC.m⁻ ³.y⁻¹. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Zoology en_ZA
dc.title Phytoplankton production studies in the coastal waters off the Cape Peninsula, South Africa en_ZA
dc.type Master 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 Masters
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Brown, P. C. (1980). <i>Phytoplankton production studies in the coastal waters off the Cape Peninsula, South Africa</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/17605 en_ZA
dc.identifier.chicagocitation Brown, Penelope Cranstoun. <i>"Phytoplankton production studies in the coastal waters off the Cape Peninsula, South Africa."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1980. http://hdl.handle.net/11427/17605 en_ZA
dc.identifier.vancouvercitation Brown PC. Phytoplankton production studies in the coastal waters off the Cape Peninsula, South Africa. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1980 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17605 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Brown, Penelope Cranstoun AB - Procedures for measuring phytoplankton production in the southern Benguela upwelling region were investigated. A 125 ml incubation bottle is recommended for routine primary production measurements. Exposure of production samples to high light intensities during manipulations on deck was found to inhibit rates of production near the bottom of the euphotic zone particularly below a thermocline. Simulated in situ rates of oxygen production were only slightly higher than in situ rates. When ships time is limited, the simulated in situ method can safely be used in local waters. Definite diel periodicity in rates of production at the sea surface was demonstrated and appears to be linked to light levels and nutrient concentrations, as well as to the ratios of light to dark hours. Since diel variation probably decreases with depth, its effect on integrated daily production is reduced. Nevertheless, the time of incubation should be chosen to minimize the effect of periodicity on daily production estimates. The period spanning noon is recommended for local use. Changes in phytoplankton production and biomass are linked with physical and chemical changes in the upwelling system off the Cape Peninsula. Extremely active upwelling was found to limit primary production and from these measurements the annual net primary production in the Cape Peninsula upwelling region is estimated for the first time to be approximately 1.13 kgC.m⁻ ³.y⁻¹. DA - 1980 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1980 T1 - Phytoplankton production studies in the coastal waters off the Cape Peninsula, South Africa TI - Phytoplankton production studies in the coastal waters off the Cape Peninsula, South Africa UR - http://hdl.handle.net/11427/17605 ER - en_ZA


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