Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem

dc.contributor.advisorField, John Gen_ZA
dc.contributor.advisorBarlow, RGen_ZA
dc.contributor.advisorPitcher, Grant Cen_ZA
dc.contributor.authorBalarin, Marianne Gen_ZA
dc.date.accessioned2015-09-25T07:44:22Z
dc.date.available2015-09-25T07:44:22Z
dc.date.issued2010en_ZA
dc.descriptionIncludes bibliographical references (leaves 139-161).en_ZA
dc.description.abstractIn their natural environment the diatoms (mixers) are exposed to fluctuations in incident irradiance due to vertical displacements in the water column induced by turbulence whereas the dinoflagellates (migrators and layer-formers) tend to control their vertical positions. In these two groups of phytoplankton physiological acclimation to these fluctuations results in the variation of a number of measurable photosynthetic parameters and variables which can be evaluated in controlled laboratory experiments. The processes can be expressed in time scales from seconds to hours e.g. carbon to chlorophyll ratio changes over several hours. Photoacclimative responses in five species of dinoflagellates (Alexandrium catenella, Protoceratium reticulatum, Prorocentrum micans, Prorocentrum triestinum, Gymnodinium zeta) and three diatom species (Chaetoceros sp., C. capense, C. cf. pendulus) were investigated with respect to parameters of P versus E curves (P*m, α* and Ek) and variability in chemical composition (C and N), photosynthetic capacity, pigment ratios, maximum quantum yield and chlorophyll to carbon ratio. These species were grown at irradiances of 33 (LL), 178 (ML) and 647 μmol quanta . m-2 . s-1 (HL) at a 12:12h day: night length at 17 ºC. The photosynthetic parameters, pigment concentration and Chl a-specific absorption were mostly affected by photoacclimational status. Species-specific differences were observed at the three different light levels in P versus E curves, pigment concentrations, absorption, carbon to chlorophyll a ratios and quantum yield. Photoprotective carotenoids (diadinoxanthin and diatoxanthin) were significantly different relative to Chl a in eight species of dinoflagellates and diatoms.en_ZA
dc.identifier.apacitationBalarin, M. G. (2010). <i>Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/14096en_ZA
dc.identifier.chicagocitationBalarin, Marianne G. <i>"Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2010. http://hdl.handle.net/11427/14096en_ZA
dc.identifier.citationBalarin, M. 2010. Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Balarin, Marianne G AB - In their natural environment the diatoms (mixers) are exposed to fluctuations in incident irradiance due to vertical displacements in the water column induced by turbulence whereas the dinoflagellates (migrators and layer-formers) tend to control their vertical positions. In these two groups of phytoplankton physiological acclimation to these fluctuations results in the variation of a number of measurable photosynthetic parameters and variables which can be evaluated in controlled laboratory experiments. The processes can be expressed in time scales from seconds to hours e.g. carbon to chlorophyll ratio changes over several hours. Photoacclimative responses in five species of dinoflagellates (Alexandrium catenella, Protoceratium reticulatum, Prorocentrum micans, Prorocentrum triestinum, Gymnodinium zeta) and three diatom species (Chaetoceros sp., C. capense, C. cf. pendulus) were investigated with respect to parameters of P versus E curves (P*m, α* and Ek) and variability in chemical composition (C and N), photosynthetic capacity, pigment ratios, maximum quantum yield and chlorophyll to carbon ratio. These species were grown at irradiances of 33 (LL), 178 (ML) and 647 μmol quanta . m-2 . s-1 (HL) at a 12:12h day: night length at 17 ºC. The photosynthetic parameters, pigment concentration and Chl a-specific absorption were mostly affected by photoacclimational status. Species-specific differences were observed at the three different light levels in P versus E curves, pigment concentrations, absorption, carbon to chlorophyll a ratios and quantum yield. Photoprotective carotenoids (diadinoxanthin and diatoxanthin) were significantly different relative to Chl a in eight species of dinoflagellates and diatoms. DA - 2010 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2010 T1 - Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem TI - Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem UR - http://hdl.handle.net/11427/14096 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/14096
dc.identifier.vancouvercitationBalarin MG. Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2010 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/14096en_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.otherZoologyen_ZA
dc.titleComparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystemen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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