Modelling the spatial distribution of three marine fish species in the southern Benguela

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dc.contributor.advisorShin, Yunne-jaien_ZA
dc.contributor.advisorYemane, Dawiten_ZA
dc.contributor.authorWilkes, Chrisen_ZA
dc.date.accessioned2014-09-22T12:00:24Z
dc.date.available2014-09-22T12:00:24Z
dc.date.issued2013en_ZA
dc.description.abstractUnderstanding the spatial distribution of species in relationship to climatic and environmental variables is key to conservation and management of important species, as their distribution might change under climate change and variability. Based on presence absence data from scientific trawl surveys, this study used Generalized Additive Model (GAM) and Krigging with External Drift (KED) statistical techniques to determine the spatial distribution of three marine fish species of commercial interest: Merluccius capensis, Merluccius paradoxus, and Thyrsites atun, on the West and South coasts of South Africa. The modelled distributions reflect the previously determined range and habitats of the two species of hake and are in accordance with the common knowledge on the biology of the two species. Presence-absence modelling found depth to be the main factor for explaining hake distribution on both coasts. For the West coast an interaction between sea surface temperature and chlorophyll-a combined with depth as a factor was found to provide the best model. On the South coast depth was the only factor retained. The models for M. capensis and M. paradoxus are potentially useful in mapping and determining future distributions based on environmental factors. The model obtained for the spatial distribution of T. atun has a lower explanatory power than those of the two hake species.en_ZA
dc.identifier.apacitationWilkes, C. (2013). <i>Modelling the spatial distribution of three marine fish species in the southern Benguela</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/7642en_ZA
dc.identifier.chicagocitationWilkes, Chris. <i>"Modelling the spatial distribution of three marine fish species in the southern Benguela."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2013. http://hdl.handle.net/11427/7642en_ZA
dc.identifier.citationWilkes, C. 2013. Modelling the spatial distribution of three marine fish species in the southern Benguela. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Wilkes, Chris AB - Understanding the spatial distribution of species in relationship to climatic and environmental variables is key to conservation and management of important species, as their distribution might change under climate change and variability. Based on presence absence data from scientific trawl surveys, this study used Generalized Additive Model (GAM) and Krigging with External Drift (KED) statistical techniques to determine the spatial distribution of three marine fish species of commercial interest: Merluccius capensis, Merluccius paradoxus, and Thyrsites atun, on the West and South coasts of South Africa. The modelled distributions reflect the previously determined range and habitats of the two species of hake and are in accordance with the common knowledge on the biology of the two species. Presence-absence modelling found depth to be the main factor for explaining hake distribution on both coasts. For the West coast an interaction between sea surface temperature and chlorophyll-a combined with depth as a factor was found to provide the best model. On the South coast depth was the only factor retained. The models for M. capensis and M. paradoxus are potentially useful in mapping and determining future distributions based on environmental factors. The model obtained for the spatial distribution of T. atun has a lower explanatory power than those of the two hake species. DA - 2013 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2013 T1 - Modelling the spatial distribution of three marine fish species in the southern Benguela TI - Modelling the spatial distribution of three marine fish species in the southern Benguela UR - http://hdl.handle.net/11427/7642 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/7642
dc.identifier.vancouvercitationWilkes C. Modelling the spatial distribution of three marine fish species in the southern Benguela. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2013 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/7642en_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.titleModelling the spatial distribution of three marine fish species in the southern Benguelaen_ZA
dc.typeBachelor Thesis
dc.type.qualificationlevelHonours
dc.type.qualificationnameBScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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