Natural survivorship estimates for the West Coast rock lobster Jasus Lalandii obtained using a size-based modelling approach

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dc.contributor.advisorBergh, M Oen_ZA
dc.contributor.authorJohnston, Susan Joyen_ZA
dc.date.accessioned2016-10-14T06:26:38Z
dc.date.available2016-10-14T06:26:38Z
dc.date.issued1991en_ZA
dc.description.abstractNatural survivorship for the South African west coast rock lobster resource, Jasus lalandii, is estimated at two locations, Robben Island and Hout Bay. A size-based modelling approach is used, in which the model is fitted, to pristine catch size frequencies. The natural survivorship value for lobsters in the Robben Island region is estimated to be 0.94. The natural survivorship value for Hout Bay lobsters is estimated to be 0.87. The natural survivorship estimates are found to be very sensitive to rock lobster growth rate. The Robben Island estimate decreases from 0.968 for a decrease of 40% in the growth rate, to 0.9 7 for a increase of 40% in the growth rate. These estimates.are compared with those made for lobsters in more northern areas. The implications of these natural survivorship estimates are discussed. A simple, direct method is used to estimate natural survivorship for Robben Island and Hout Bay, and the results are compared to those obtained with the model. Includes bibliographical references (pages 64-68).en_ZA
dc.identifier.apacitationJohnston, S. J. (1991). <i>Natural survivorship estimates for the West Coast rock lobster Jasus Lalandii obtained using a size-based modelling approach</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/22131en_ZA
dc.identifier.chicagocitationJohnston, Susan Joy. <i>"Natural survivorship estimates for the West Coast rock lobster Jasus Lalandii obtained using a size-based modelling approach."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1991. http://hdl.handle.net/11427/22131en_ZA
dc.identifier.citationJohnston, S. 1991. Natural survivorship estimates for the West Coast rock lobster Jasus Lalandii obtained using a size-based modelling approach. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Johnston, Susan Joy AB - Natural survivorship for the South African west coast rock lobster resource, Jasus lalandii, is estimated at two locations, Robben Island and Hout Bay. A size-based modelling approach is used, in which the model is fitted, to pristine catch size frequencies. The natural survivorship value for lobsters in the Robben Island region is estimated to be 0.94. The natural survivorship value for Hout Bay lobsters is estimated to be 0.87. The natural survivorship estimates are found to be very sensitive to rock lobster growth rate. The Robben Island estimate decreases from 0.968 for a decrease of 40% in the growth rate, to 0.9 7 for a increase of 40% in the growth rate. These estimates.are compared with those made for lobsters in more northern areas. The implications of these natural survivorship estimates are discussed. A simple, direct method is used to estimate natural survivorship for Robben Island and Hout Bay, and the results are compared to those obtained with the model. Includes bibliographical references (pages 64-68). DA - 1991 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1991 T1 - Natural survivorship estimates for the West Coast rock lobster Jasus Lalandii obtained using a size-based modelling approach TI - Natural survivorship estimates for the West Coast rock lobster Jasus Lalandii obtained using a size-based modelling approach UR - http://hdl.handle.net/11427/22131 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/22131
dc.identifier.vancouvercitationJohnston SJ. Natural survivorship estimates for the West Coast rock lobster Jasus Lalandii obtained using a size-based modelling approach. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1991 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/22131en_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.subject.otherQuantitative Resource Ecologyen_ZA
dc.titleNatural survivorship estimates for the West Coast rock lobster Jasus Lalandii obtained using a size-based modelling approachen_ZA
dc.typeMaster Thesis
dc.type.qualificationlevelMasters
dc.type.qualificationnameMScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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