The African penguin Spheniscus demersus : conservation and management issues

 

Show simple item record

dc.contributor.advisor Underhill, Les en_ZA
dc.contributor.author Waller, Lauren en_ZA
dc.date.accessioned 2015-01-02T09:25:53Z
dc.date.available 2015-01-02T09:25:53Z
dc.date.issued 2011 en_ZA
dc.identifier.citation Waller, L. 2011. The African penguin Spheniscus demersus : conservation and management issues. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/11042
dc.description Includes bibliographical references. en_ZA
dc.description.abstract The African penguin is a southern African endemic, with its breeding distribution within the Benguela Upwelling Ecosystem. The IUCN conservation status of this species was re-classified from ‘Vulnerable’ to ‘Endangered’ in 2010. This thesis investigated some aspects pertinent to the species’ conservation and management. Time series of population estimates of African penguins and fish biomass were available in South Africa since the late 1980s. This study analysed the fish biomass at a stratum scale, which is a finer scale to that of previous studies which looked at biomass estimates as a whole. The strata range in length from c. 155 km to c. 280 km in length. The number of African penguin breeders and adult moulters were found to be positively correlated with fish biomass estimates, although results of the spatial relationships were unexpected. The islands which displayed the strongest relationships were Dassen Island and Robben Island. These islands are only c. 50 km apart, and it is expected that they would experience similar oceanographic conditions. However, the colonies at these islands were found to respond differently to fish biomass estimates. While the number of Dassen Island birds were found to be positively correlated with biomass estimates within the strata in which the island is found, the number of Robben Island birds were correlated with biomass estimates of the stratum to the south and east of the island. Weaker relationships were found for the remaining colonies. This study suggested that the period of moult is of critical importance to the survival of the penguin, an aspect that needs to be incorporated into the Ecosystem Approach to Fisheries modelling. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Zoology en_ZA
dc.title The African penguin Spheniscus demersus : conservation and management issues en_ZA
dc.type Doctoral Thesis
uct.type.publication Research en_ZA
uct.type.resource Thesis en_ZA
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Biological Sciences en_ZA
dc.type.qualificationlevel Doctoral
dc.type.qualificationname PhD en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Waller, L. (2011). <i>The African penguin Spheniscus demersus : conservation and management issues</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/11042 en_ZA
dc.identifier.chicagocitation Waller, Lauren. <i>"The African penguin Spheniscus demersus : conservation and management issues."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2011. http://hdl.handle.net/11427/11042 en_ZA
dc.identifier.vancouvercitation Waller L. The African penguin Spheniscus demersus : conservation and management issues. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2011 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/11042 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Waller, Lauren AB - The African penguin is a southern African endemic, with its breeding distribution within the Benguela Upwelling Ecosystem. The IUCN conservation status of this species was re-classified from ‘Vulnerable’ to ‘Endangered’ in 2010. This thesis investigated some aspects pertinent to the species’ conservation and management. Time series of population estimates of African penguins and fish biomass were available in South Africa since the late 1980s. This study analysed the fish biomass at a stratum scale, which is a finer scale to that of previous studies which looked at biomass estimates as a whole. The strata range in length from c. 155 km to c. 280 km in length. The number of African penguin breeders and adult moulters were found to be positively correlated with fish biomass estimates, although results of the spatial relationships were unexpected. The islands which displayed the strongest relationships were Dassen Island and Robben Island. These islands are only c. 50 km apart, and it is expected that they would experience similar oceanographic conditions. However, the colonies at these islands were found to respond differently to fish biomass estimates. While the number of Dassen Island birds were found to be positively correlated with biomass estimates within the strata in which the island is found, the number of Robben Island birds were correlated with biomass estimates of the stratum to the south and east of the island. Weaker relationships were found for the remaining colonies. This study suggested that the period of moult is of critical importance to the survival of the penguin, an aspect that needs to be incorporated into the Ecosystem Approach to Fisheries modelling. DA - 2011 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2011 T1 - The African penguin Spheniscus demersus : conservation and management issues TI - The African penguin Spheniscus demersus : conservation and management issues UR - http://hdl.handle.net/11427/11042 ER - en_ZA


Files in this item

This item appears in the following Collection(s)

Show simple item record