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A scanning electron and light microscopy study of the red tide dinoflagellate Gymnodinium sp. from False Bay, South Africa
A previously unrecorded red tide dinoflagellate bloomed in False Bay during 1988 and 1989, causing faunal mortalities as well as eye, nose and lung irritations to bathers and fishermen. Light microscopy and scanning electron microscopy was used in an attempt to identify this species which shared cer...
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| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2017
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| _version_ | 1867613589391540224 |
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| access_status_str | Open Access |
| author | Dawood, Abeda |
| author2 | Bolton, John J |
| author_browse | Bolton, John J Dawood, Abeda |
| author_facet | Bolton, John J Dawood, Abeda |
| author_sort | Dawood, Abeda |
| collection | Thesis |
| description | A previously unrecorded red tide dinoflagellate bloomed in False Bay during 1988 and 1989, causing faunal mortalities as well as eye, nose and lung irritations to bathers and fishermen. Light microscopy and scanning electron microscopy was used in an attempt to identify this species which shared certain features with the following species: (a) Gymnodinium nagasakiense Takayama et Adachi, the western Pacific species, with which it has the external morphology in common, (b) Gyrodinium aureolum Hulburt, the North Atlantic species which is common in northern European and eastern USA waters, with which it shares the cell shape and the nucleus position, (c) Ptychodiscus brevis (Davis) Steidinger, the north American species, which has a similar toxic effect. Ptychodiscus brevis differed from the False Bay organism in several aspects, including cell contour, the possession of an apical protrusion, and the toxins of P. brevis are lipid soluble whereas the toxins of Gymnodinium sp. are water soluble. The local species was morphologically similar to Gymnodinium nagasakiense but had the nucleus in a different position. G. nagasakiense has the nucleus in the left side of the cell, whereas in the local species the nucleus was situated sub-centrally to centrally. It is concluded that Gynnodinium sp. was most similar to Gyrodiniun aureolum but differed in their toxic effects. The epithet Gyrodiniun cf. aureolum is suggested although the local species may be a new species. Further research using DNA contents and transmission electron microscopy are needed to clarify this problem. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/25885 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:38:33.174Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2017 |
| publishDateRange | 2017 |
| publishDateSort | 2017 |
| 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:11427/25885 A scanning electron and light microscopy study of the red tide dinoflagellate Gymnodinium sp. from False Bay, South Africa Dawood, Abeda Bolton, John J Botany A previously unrecorded red tide dinoflagellate bloomed in False Bay during 1988 and 1989, causing faunal mortalities as well as eye, nose and lung irritations to bathers and fishermen. Light microscopy and scanning electron microscopy was used in an attempt to identify this species which shared certain features with the following species: (a) Gymnodinium nagasakiense Takayama et Adachi, the western Pacific species, with which it has the external morphology in common, (b) Gyrodinium aureolum Hulburt, the North Atlantic species which is common in northern European and eastern USA waters, with which it shares the cell shape and the nucleus position, (c) Ptychodiscus brevis (Davis) Steidinger, the north American species, which has a similar toxic effect. Ptychodiscus brevis differed from the False Bay organism in several aspects, including cell contour, the possession of an apical protrusion, and the toxins of P. brevis are lipid soluble whereas the toxins of Gymnodinium sp. are water soluble. The local species was morphologically similar to Gymnodinium nagasakiense but had the nucleus in a different position. G. nagasakiense has the nucleus in the left side of the cell, whereas in the local species the nucleus was situated sub-centrally to centrally. It is concluded that Gynnodinium sp. was most similar to Gyrodiniun aureolum but differed in their toxic effects. The epithet Gyrodiniun cf. aureolum is suggested although the local species may be a new species. Further research using DNA contents and transmission electron microscopy are needed to clarify this problem. 2017-10-30T06:56:20Z 2017-10-30T06:56:20Z 1990 2017-03-17T10:35:39Z Bachelor Thesis Honours BSc (Hons) http://hdl.handle.net/11427/25885 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Botany Dawood, Abeda A scanning electron and light microscopy study of the red tide dinoflagellate Gymnodinium sp. from False Bay, South Africa |
| thesis_degree_str | Bachelor's / Honours |
| title | A scanning electron and light microscopy study of the red tide dinoflagellate Gymnodinium sp. from False Bay, South Africa |
| title_full | A scanning electron and light microscopy study of the red tide dinoflagellate Gymnodinium sp. from False Bay, South Africa |
| title_fullStr | A scanning electron and light microscopy study of the red tide dinoflagellate Gymnodinium sp. from False Bay, South Africa |
| title_full_unstemmed | A scanning electron and light microscopy study of the red tide dinoflagellate Gymnodinium sp. from False Bay, South Africa |
| title_short | A scanning electron and light microscopy study of the red tide dinoflagellate Gymnodinium sp. from False Bay, South Africa |
| title_sort | scanning electron and light microscopy study of the red tide dinoflagellate gymnodinium sp from false bay south africa |
| topic | Botany |
| url | http://hdl.handle.net/11427/25885 |
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