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An analysis of factors controlling the distribution of zooplankton in the Knysna estuary, South Africa
The Knysna estuary system, on the south coast of South Africa, was sampled for zooplankton over period of one year. All species were recorded and an attempt was made at relating the distribution of populations to physical factors within the estuary. Over 50 species were identified. Pseudodiaptomus h...
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| Format: | Thesis |
| Language: | English |
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Department of Biological Sciences
2016
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| _version_ | 1867614180414062592 |
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| access_status_str | Open Access |
| author | Veldhuis, Helen Anne |
| author2 | Griffiths, Charles L |
| author_browse | Griffiths, Charles L Veldhuis, Helen Anne |
| author_facet | Griffiths, Charles L Veldhuis, Helen Anne |
| author_sort | Veldhuis, Helen Anne |
| collection | Thesis |
| description | The Knysna estuary system, on the south coast of South Africa, was sampled for zooplankton over period of one year. All species were recorded and an attempt was made at relating the distribution of populations to physical factors within the estuary. Over 50 species were identified. Pseudodiaptomus hessei, Acartia(Paracartia) longipatella and A.(Acartiella) natalensis were the dominant copepods in the upper estuary. Paracalanus spp. were dominant near the mouth. Zooplankton distribution was found to be related to tidal exchange. The zooplankton displayed a seasonal cycle of abundance, with maximum numbers occuring during summer. P. hessei displayed no pronounced seasonal cycle in abundance. Its abundance was strongly related to freshwater inflow. Seasonal succession was evident between A. natalensis, the summer dominant, and A. longipatella, the winter dominant. The controlling factors for this cyclical dominance were not clear. Diel vertical migration behaviour was shown to various degrees by virtually all zooplankton populations. The stimulus for this behaviour could not be definitely identified. |
| format | Thesis |
| id | oai:open.uct.ac.za:11427/22015 |
| institution | University of Cape Town (South Africa) |
| language | eng |
| last_indexed | 2026-06-10T12:47:56.817Z |
| license_str | Not specified — see source repository |
| provenance_str_mv | Harvested via OAI-PMH from UCTD — University of Cape Town Open Access Repository |
| publishDate | 2016 |
| publishDateRange | 2016 |
| publishDateSort | 2016 |
| 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:11427/22015 An analysis of factors controlling the distribution of zooplankton in the Knysna estuary, South Africa Veldhuis, Helen Anne Griffiths, Charles L Zooplankton Estuarine ecology Zoology The Knysna estuary system, on the south coast of South Africa, was sampled for zooplankton over period of one year. All species were recorded and an attempt was made at relating the distribution of populations to physical factors within the estuary. Over 50 species were identified. Pseudodiaptomus hessei, Acartia(Paracartia) longipatella and A.(Acartiella) natalensis were the dominant copepods in the upper estuary. Paracalanus spp. were dominant near the mouth. Zooplankton distribution was found to be related to tidal exchange. The zooplankton displayed a seasonal cycle of abundance, with maximum numbers occuring during summer. P. hessei displayed no pronounced seasonal cycle in abundance. Its abundance was strongly related to freshwater inflow. Seasonal succession was evident between A. natalensis, the summer dominant, and A. longipatella, the winter dominant. The controlling factors for this cyclical dominance were not clear. Diel vertical migration behaviour was shown to various degrees by virtually all zooplankton populations. The stimulus for this behaviour could not be definitely identified. 2016-09-29T17:15:44Z 2016-09-29T17:15:44Z 1987 Master Thesis Masters MSc http://hdl.handle.net/11427/22015 eng application/pdf Department of Biological Sciences Faculty of Science University of Cape Town |
| spellingShingle | Zooplankton Estuarine ecology Zoology Veldhuis, Helen Anne An analysis of factors controlling the distribution of zooplankton in the Knysna estuary, South Africa |
| thesis_degree_str | Master's |
| title | An analysis of factors controlling the distribution of zooplankton in the Knysna estuary, South Africa |
| title_full | An analysis of factors controlling the distribution of zooplankton in the Knysna estuary, South Africa |
| title_fullStr | An analysis of factors controlling the distribution of zooplankton in the Knysna estuary, South Africa |
| title_full_unstemmed | An analysis of factors controlling the distribution of zooplankton in the Knysna estuary, South Africa |
| title_short | An analysis of factors controlling the distribution of zooplankton in the Knysna estuary, South Africa |
| title_sort | analysis of factors controlling the distribution of zooplankton in the knysna estuary south africa |
| topic | Zooplankton Estuarine ecology Zoology |
| url | http://hdl.handle.net/11427/22015 |
| work_keys_str_mv | AT veldhuishelenanne ananalysisoffactorscontrollingthedistributionofzooplanktonintheknysnaestuarysouthafrica AT veldhuishelenanne analysisoffactorscontrollingthedistributionofzooplanktonintheknysnaestuarysouthafrica |