Great white sharks Carcharodon carcharias in Gansbaai, South Africa : environmental influences and changes over time, 2007-2011

dc.contributor.advisorUnderhill, Lesen_ZA
dc.contributor.advisorSmale, Malcolmen_ZA
dc.contributor.authorTowner, Alisonen_ZA
dc.date.accessioned2014-10-17T07:33:35Z
dc.date.available2014-10-17T07:33:35Z
dc.date.issued2012en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractThe South African Government introduced protective legislation prohibiting targeted fishing of the great white shark Carcharodon carcharias in 1991. This pre-emptive measure was intended to protect this species from increasing fishing pressure to allow researchers to gather information of this shark’s distribution, basic life history traits, breeding behaviour, and habitat use. Following this, the species conservation status was placed on CITES Appendix II and classified on the IUCN (International Union for the Conservation of Nature) Red List as Vulnerable. This thesis investigates white sharks at Gansbaai, in particular their occurrence, changes over time and the influence of environmental variables on their numbers there. The size and numbers of white sharks were recorded from an anchored cage diving vessel over a five-year period between 2007 and 2011. The study was conducted around Dyer Island and the inshore region of Gansbaai in the Western Cape of South Africa. A change in size frequency between seasons suggests that the white sharks are not resident for long periods, but that different size classes use the coastal bay at different times. There was a statistically significant change of size distribution over the five years for both male and female sharks. The trend of larger sizes recorded later in the study could infer a change in the cohorts visiting the bay or growth of the same individuals exhibiting site fidelity to the area.en_ZA
dc.identifier.apacitationTowner, A. (2012). <i>Great white sharks Carcharodon carcharias in Gansbaai, South Africa : environmental influences and changes over time, 2007-2011</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/8497en_ZA
dc.identifier.chicagocitationTowner, Alison. <i>"Great white sharks Carcharodon carcharias in Gansbaai, South Africa : environmental influences and changes over time, 2007-2011."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2012. http://hdl.handle.net/11427/8497en_ZA
dc.identifier.citationTowner, A. 2012. Great white sharks Carcharodon carcharias in Gansbaai, South Africa : environmental influences and changes over time, 2007-2011. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Towner, Alison AB - The South African Government introduced protective legislation prohibiting targeted fishing of the great white shark Carcharodon carcharias in 1991. This pre-emptive measure was intended to protect this species from increasing fishing pressure to allow researchers to gather information of this shark’s distribution, basic life history traits, breeding behaviour, and habitat use. Following this, the species conservation status was placed on CITES Appendix II and classified on the IUCN (International Union for the Conservation of Nature) Red List as Vulnerable. This thesis investigates white sharks at Gansbaai, in particular their occurrence, changes over time and the influence of environmental variables on their numbers there. The size and numbers of white sharks were recorded from an anchored cage diving vessel over a five-year period between 2007 and 2011. The study was conducted around Dyer Island and the inshore region of Gansbaai in the Western Cape of South Africa. A change in size frequency between seasons suggests that the white sharks are not resident for long periods, but that different size classes use the coastal bay at different times. There was a statistically significant change of size distribution over the five years for both male and female sharks. The trend of larger sizes recorded later in the study could infer a change in the cohorts visiting the bay or growth of the same individuals exhibiting site fidelity to the area. DA - 2012 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2012 T1 - Great white sharks Carcharodon carcharias in Gansbaai, South Africa : environmental influences and changes over time, 2007-2011 TI - Great white sharks Carcharodon carcharias in Gansbaai, South Africa : environmental influences and changes over time, 2007-2011 UR - http://hdl.handle.net/11427/8497 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/8497
dc.identifier.vancouvercitationTowner A. Great white sharks Carcharodon carcharias in Gansbaai, South Africa : environmental influences and changes over time, 2007-2011. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2012 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/8497en_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.otherZoologyen_ZA
dc.titleGreat white sharks Carcharodon carcharias in Gansbaai, South Africa : environmental influences and changes over time, 2007-2011en_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
Files
Original bundle
Now showing 1 - 1 of 1
Loading...
Thumbnail Image
Name:
thesis_sci_2012_towner_a.pdf
Size:
3.02 MB
Format:
Adobe Portable Document Format
Description:
Collections