Residency, habitat use and sexual segregation of white sharks, Carcharodon carcharias in False Bay, South Africa

 

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dc.contributor.author Kock, Alison en_ZA
dc.contributor.author O'Riain, M Justin en_ZA
dc.contributor.author Mauff, Katya en_ZA
dc.contributor.author Meÿer, Michael en_ZA
dc.contributor.author Kotze, Deon en_ZA
dc.contributor.author Griffiths, Charles en_ZA
dc.date.accessioned 2015-11-16T04:14:17Z
dc.date.available 2015-11-16T04:14:17Z
dc.date.issued 2013 en_ZA
dc.identifier.citation Kock, A., O’Riain, M. J., Mauff, K., Meÿer, M., Kotze, D., & Griffiths, C. (2013). Residency, habitat use and sexual segregation of white sharks, Carcharodon carcharias in False Bay, South Africa. PLoS One, 8(1), e55048. doi:10.1371/journal.pone.0055048 en_ZA
dc.identifier.uri http://hdl.handle.net/11427/15036
dc.identifier.uri http://dx.doi.org/10.1371/journal.pone.0055048
dc.description.abstract White sharks ( Carcharodon carcharias ) are threatened apex predators and identification of their critical habitats and how these are used are essential to ensuring improved local and ultimately global white shark protection. In this study we investigated habitat use by white sharks in False Bay, South Africa, using acoustic telemetry. 56 sharks (39 female, 17 male), ranging in size from 1.7-5 m TL, were tagged with acoustic transmitters and monitored on an array of 30 receivers for 975 days. To investigate the effects of season, sex and size on habitat use we used a generalized linear mixed effects model. Tagged sharks were detected in the Bay in all months and across all years, but their use of the Bay varied significantly with the season and the sex of the shark. In autumn and winter males and females aggregated around the Cape fur seal colony at Seal Island, where they fed predominantly on young of the year seals. In spring and summer there was marked sexual segregation, with females frequenting the Inshore areas and males seldom being detected. The shift from the Island in autumn and winter to the Inshore region in spring and summer by females mirrors the seasonal peak in abundance of juvenile seals and of migratory teleost and elasmobranch species respectively. This study provides the first evidence of sexual segregation at a fine spatial scale and demonstrates that sexual segregation in white sharks is not restricted to adults, but is apparent for juveniles and sub-adults too. Overall, the results confirm False Bay as a critical area for white shark conservation as both sexes, across a range of sizes, frequent the Bay on an annual basis. The finding that female sharks aggregate in the Inshore regions when recreational use peaks highlights the need for ongoing shark-human conflict mitigation strategies. en_ZA
dc.language.iso eng en_ZA
dc.publisher Public Library of Science en_ZA
dc.rights This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. en_ZA
dc.rights.uri http://creativecommons.org/licenses/by/4.0 en_ZA
dc.source PLoS One en_ZA
dc.source.uri http://journals.plos.org/plosone en_ZA
dc.subject.other Sharks en_ZA
dc.subject.other Acoustics en_ZA
dc.subject.other Habitats en_ZA
dc.subject.other Seals en_ZA
dc.subject.other South Africa en_ZA
dc.subject.other Animal migration en_ZA
dc.subject.other Coastal regions en_ZA
dc.subject.other Predation en_ZA
dc.title Residency, habitat use and sexual segregation of white sharks, Carcharodon carcharias in False Bay, South Africa en_ZA
dc.type Journal Article en_ZA
dc.rights.holder © 2013 Kock et al en_ZA
uct.type.publication Research en_ZA
uct.type.resource Article 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
uct.type.filetype Text
uct.type.filetype Image


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This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited. Except where otherwise noted, this item's license is described as This is an open-access article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.