Summer at the beach: spatio-temporal patterns of white shark occurrence along the inshore areas of False Bay, South Africa

 

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dc.contributor.author Kock, Alison A
dc.contributor.author Photopoulou, Theoni
dc.contributor.author Durbach, Ian
dc.contributor.author Mauff, Katya
dc.contributor.author Meÿer, Michael
dc.contributor.author Kotze, Deon
dc.contributor.author Griffiths, Charles L
dc.contributor.author O’Riain, M Justin
dc.date.accessioned 2018-05-28T10:13:34Z
dc.date.available 2018-05-28T10:13:34Z
dc.date.issued 2018-05-22
dc.identifier.citation Movement Ecology. 2018 May 22;6(1):7
dc.identifier.uri https://doi.org/10.1186/s40462-018-0125-5
dc.identifier.uri http://hdl.handle.net/11427/28166
dc.description.abstract Background Understanding white shark (Carcharodon carcharias) habitat use in coastal areas adjacent to large cities, is an important step when formulating potential solutions to the conservation conflict that exists between humans and large predatory sharks. In this study, we present the findings of a 2.5-year study of white shark occurrence and movement patterns adjacent to the City of Cape Town in False Bay, South Africa, with a focus on spring and summer months. Fifty-one white sharks were monitored annually at three offshore and twelve inshore sites by VR2 acoustic receivers, over 975 days from 1 May 2005 to 31 December 2007. Results Occurrence patterns at inshore sites during spring and summer were analysed using a generalized additive mixed model (GAMM) with a spatial term (longitude, latitude), time of day and year included as explanatory variables for site use. We found that sharks occurred more frequently at inshore sites along the northern and northwestern shores, compared to the rest of the bay, and they transitioned most frequently between four adjacent beach sites that encompass the most popular recreational water use areas in Cape Town. There was significant diel variation, with higher shark occurrence around midday, and a peak in shark occurrence in 2005, when human-shark interactions also peaked. However, we found no effect of shark size on occurrence patterns at inshore sites. Conclusions White sharks showed the highest levels of occurrence at specific inshore sites between Muizenberg and Strandfontein beach, and thus inclusion of these sites within False Bay’s marine protected area (MPA) network or recognition as Ecological or Biological Significant Areas (EBSAs) should be a future consideration. These insights into white shark habitat use at inshore sites in False Bay are important for successfully applying the principles of marine spatial planning (MSP) and for making science-based policy decisions. Furthermore, this information can be used to reduce potential shark-human conflict by incorporating it into future shark safety education campaigns.
dc.language.iso en
dc.publisher BioMed Central
dc.source Movement Ecology
dc.source.uri https://movementecologyjournal.biomedcentral.com/
dc.subject.other White shark
dc.subject.other Carcharodon carcharias
dc.subject.other Telemetry
dc.subject.other Habitat use
dc.subject.other Marine protected area
dc.subject.other Marine spatial planning
dc.subject.other Conservation
dc.subject.other False Bay
dc.subject.other Cape town
dc.title Summer at the beach: spatio-temporal patterns of white shark occurrence along the inshore areas of False Bay, South Africa
dc.type Journal Article
dc.date.updated 2018-05-27T03:30:15Z
dc.rights.holder The Author(s).
dc.publisher.institution University of Cape Town
dc.publisher.faculty Faculty of Science en_ZA
dc.publisher.department Department of Biological Sciences en_ZA
uct.type.filetype Text
uct.type.filetype Image
dc.identifier.apacitation Kock, A. A., Photopoulou, T., Durbach, I., Mauff, K., Meÿer, M., Kotze, D., ... (2018). Summer at the beach: spatio-temporal patterns of white shark occurrence along the inshore areas of False Bay, South Africa. <i>Movement Ecology</i>, http://hdl.handle.net/11427/28166 en_ZA
dc.identifier.chicagocitation Kock, Alison A, Theoni Photopoulou, Ian Durbach, Katya Mauff, Michael Meÿer, Deon Kotze, Charles L Griffiths, and "Summer at the beach: spatio-temporal patterns of white shark occurrence along the inshore areas of False Bay, South Africa." <i>Movement Ecology</i> (2018) http://hdl.handle.net/11427/28166 en_ZA
dc.identifier.vancouvercitation Kock AA, Photopoulou T, Durbach I, Mauff K, Meÿer M, Kotze D, et al. Summer at the beach: spatio-temporal patterns of white shark occurrence along the inshore areas of False Bay, South Africa. Movement Ecology. 2018; http://hdl.handle.net/11427/28166. en_ZA
dc.identifier.ris TY - Journal Article AU - Kock, Alison A AU - Photopoulou, Theoni AU - Durbach, Ian AU - Mauff, Katya AU - Meÿer, Michael AU - Kotze, Deon AU - Griffiths, Charles L AU - O’Riain, M Justin AB - Background Understanding white shark (Carcharodon carcharias) habitat use in coastal areas adjacent to large cities, is an important step when formulating potential solutions to the conservation conflict that exists between humans and large predatory sharks. In this study, we present the findings of a 2.5-year study of white shark occurrence and movement patterns adjacent to the City of Cape Town in False Bay, South Africa, with a focus on spring and summer months. Fifty-one white sharks were monitored annually at three offshore and twelve inshore sites by VR2 acoustic receivers, over 975 days from 1 May 2005 to 31 December 2007. Results Occurrence patterns at inshore sites during spring and summer were analysed using a generalized additive mixed model (GAMM) with a spatial term (longitude, latitude), time of day and year included as explanatory variables for site use. We found that sharks occurred more frequently at inshore sites along the northern and northwestern shores, compared to the rest of the bay, and they transitioned most frequently between four adjacent beach sites that encompass the most popular recreational water use areas in Cape Town. There was significant diel variation, with higher shark occurrence around midday, and a peak in shark occurrence in 2005, when human-shark interactions also peaked. However, we found no effect of shark size on occurrence patterns at inshore sites. Conclusions White sharks showed the highest levels of occurrence at specific inshore sites between Muizenberg and Strandfontein beach, and thus inclusion of these sites within False Bay’s marine protected area (MPA) network or recognition as Ecological or Biological Significant Areas (EBSAs) should be a future consideration. These insights into white shark habitat use at inshore sites in False Bay are important for successfully applying the principles of marine spatial planning (MSP) and for making science-based policy decisions. Furthermore, this information can be used to reduce potential shark-human conflict by incorporating it into future shark safety education campaigns. DA - 2018-05-22 DB - OpenUCT DP - University of Cape Town J1 - Movement Ecology LK - https://open.uct.ac.za PB - University of Cape Town PY - 2018 T1 - Summer at the beach: spatio-temporal patterns of white shark occurrence along the inshore areas of False Bay, South Africa TI - Summer at the beach: spatio-temporal patterns of white shark occurrence along the inshore areas of False Bay, South Africa UR - http://hdl.handle.net/11427/28166 ER - en_ZA


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