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Life on a gradient : activity levels of the seastar Patiriella exigua in different abiotic conditions
Two morphs of Patiriella exigua occur in South Africa. These morphs occur on opposite sides of a temperature divide present at Cape Point. The green morph occurring on the West Coast (cold temperate) and the mottled morph occurring on the South Coast (warm temperate). In a previous study by Katherin...
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| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2017
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| _version_ | 1867613210537885696 |
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| access_status_str | Open Access |
| author | Sankar, Kishan |
| author2 | Dunbar, Katherine |
| author_browse | Dunbar, Katherine Sankar, Kishan |
| author_facet | Dunbar, Katherine Sankar, Kishan |
| author_sort | Sankar, Kishan |
| collection | Thesis |
| description | Two morphs of Patiriella exigua occur in South Africa. These morphs occur on opposite sides of a temperature divide present at Cape Point. The green morph occurring on the West Coast (cold temperate) and the mottled morph occurring on the South Coast (warm temperate). In a previous study by Katherine Dunbar these two morphs were shown to be the same species. This project tests if there is a physiological difference between the two morphs of P. exigua. This was achieved by observing the activity coefficient of righting response of the two morphs of P. exigua under different temperatures and dissolved oxygen concentrations. The green morph was collected from Green Point (West Coast) and the mottled morph from Kalk Bay (South Coast). The results of a general linear model indicated that temperature and dissolved oxygen were significant factors determining righting time of P. exigua with P-values of less than 0.05. AT-test indicated that there was a significant difference between the righting times of the two morphs of P. exigua with the green morph turning at a faster rate than the mottled morph when placed under similar conditions. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/26051 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:32:31.718Z |
| 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:11427/26051 Life on a gradient : activity levels of the seastar Patiriella exigua in different abiotic conditions Sankar, Kishan Dunbar, Katherine Griffiths, Charles L Marine Biology Two morphs of Patiriella exigua occur in South Africa. These morphs occur on opposite sides of a temperature divide present at Cape Point. The green morph occurring on the West Coast (cold temperate) and the mottled morph occurring on the South Coast (warm temperate). In a previous study by Katherine Dunbar these two morphs were shown to be the same species. This project tests if there is a physiological difference between the two morphs of P. exigua. This was achieved by observing the activity coefficient of righting response of the two morphs of P. exigua under different temperatures and dissolved oxygen concentrations. The green morph was collected from Green Point (West Coast) and the mottled morph from Kalk Bay (South Coast). The results of a general linear model indicated that temperature and dissolved oxygen were significant factors determining righting time of P. exigua with P-values of less than 0.05. AT-test indicated that there was a significant difference between the righting times of the two morphs of P. exigua with the green morph turning at a faster rate than the mottled morph when placed under similar conditions. 2017-11-07T13:34:11Z 2017-11-07T13:34:11Z 2005 2017-02-15T12:22:19Z Bachelor Thesis Honours BSc (Hons) http://hdl.handle.net/11427/26051 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Marine Biology Sankar, Kishan Life on a gradient : activity levels of the seastar Patiriella exigua in different abiotic conditions |
| thesis_degree_str | Bachelor's / Honours |
| title | Life on a gradient : activity levels of the seastar Patiriella exigua in different abiotic conditions |
| title_full | Life on a gradient : activity levels of the seastar Patiriella exigua in different abiotic conditions |
| title_fullStr | Life on a gradient : activity levels of the seastar Patiriella exigua in different abiotic conditions |
| title_full_unstemmed | Life on a gradient : activity levels of the seastar Patiriella exigua in different abiotic conditions |
| title_short | Life on a gradient : activity levels of the seastar Patiriella exigua in different abiotic conditions |
| title_sort | life on a gradient activity levels of the seastar patiriella exigua in different abiotic conditions |
| topic | Marine Biology |
| url | http://hdl.handle.net/11427/26051 |
| work_keys_str_mv | AT sankarkishan lifeonagradientactivitylevelsoftheseastarpatiriellaexiguaindifferentabioticconditions |