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Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem
Includes bibliographical references (leaves 139-161).
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| Main Author: | |
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| Other Authors: | |
| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2015
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| _version_ | 1867613298975834112 |
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| access_status_str | Open Access |
| author | Balarin, Marianne G |
| author2 | Field, John G |
| author_browse | Balarin, Marianne G Field, John G |
| author_facet | Field, John G Balarin, Marianne G |
| author_sort | Balarin, Marianne G |
| collection | Thesis |
| description | Includes bibliographical references (leaves 139-161). |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/14096 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:33:55.830Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2015 |
| publishDateRange | 2015 |
| publishDateSort | 2015 |
| publisher | Department of Biological Sciences |
| publisherStr | Department of Biological Sciences |
| record_format | dspace |
| source_str | UCTD — University of Cape Town Open Access Repository |
| spelling | oai:open.uct.ac.za:11427/14096 Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem Balarin, Marianne G Field, John G Barlow, RG Pitcher, Grant C Zoology Includes bibliographical references (leaves 139-161). 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. 2015-09-25T07:44:22Z 2015-09-25T07:44:22Z 2010 Doctoral Thesis Doctoral PhD http://hdl.handle.net/11427/14096 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Zoology Balarin, Marianne G Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem |
| thesis_degree_str | Doctoral |
| title | Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem |
| title_full | Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem |
| title_fullStr | Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem |
| title_full_unstemmed | Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem |
| title_short | Comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the Benguela ecosystem |
| title_sort | comparative laboratory study of photoacclimation in selected dinoflagellate and diatom species of the benguela ecosystem |
| topic | Zoology |
| url | http://hdl.handle.net/11427/14096 |
| work_keys_str_mv | AT balarinmarianneg comparativelaboratorystudyofphotoacclimationinselecteddinoflagellateanddiatomspeciesofthebenguelaecosystem |