Baited remote underwater video survey of macro-invertebrate distribution and abundance across False Bay, South Africa

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dc.contributor.advisorAttwood, Colinen_ZA
dc.contributor.authorCarr, Isabelleen_ZA
dc.date.accessioned2015-05-04T07:14:08Z
dc.date.available2015-05-04T07:14:08Z
dc.date.issued2014en_ZA
dc.descriptionIncludes bibliographical references.en_ZA
dc.description.abstractAssessing invertebrate species diversity and distribution based on environmental predictors is essential for conservation planning. South Africa need to understand ecological patterns to better plan for species conservation. South Africa’s unique coastline requires additional protection, but the design of areas is reliant on evidence based research. South Africa has a distinctive marine environment and is host to tropical, subtropical and temperate invertebrate species. False Bay in the Western Cape province of South Africa is a biodiversity hotspot with high species richness due to the overlap of two bioregions. This project reports on the first comprehensive camera survey of False Bay’s invertebrate population and assesses diversity across more habitat types and a greater depth range than previous dredge studies. 154 sites were sampled across summer and winter, reef and sand and three depth categories: shallow (5-15 m), intermediate (16-30 m) and deep (31-50 m). A total of 67 species from 8 phyla were recorded in this study. Winter samples showed a greater diversity than those sampled in summer (p=0.004). Intermediate depths (Shannon-H=1.184) and reef substrate (Shannon-H=1.403) support a greater diversity of invertebrate species. Habitat emerged as the most significant predictor of species distribution in the bay (p=0.01). Depth (p=0.01) and season (p=0.03) were also of influence, but to a lesser extent. Reef sites were separated from sand sites by the presence of Jasus lalandii and Comanthus wahlbergi on the former and Bullia laevissima, Marthasterias glacialis and Ovalipes trimaculates on the latter. Reef species J. lalandii and Tropiometra carinata and sand species B. laevissima and M. glacialis had the greatest contribution to dissimilarity between winter and summer samples. Complex granite reefs should be a main priority in invertebrate conservation as they host the greatest species diversity and abundance of all habitats sampled. BRUVs have provided a non-invasive, non-destructive method of sampling invertebrate species on all habitat types and are recommended for use in future studies of invertebrate species composition.en_ZA
dc.identifier.apacitationCarr, I. (2014). <i>Baited remote underwater video survey of macro-invertebrate distribution and abundance across False Bay, South Africa</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/12728en_ZA
dc.identifier.chicagocitationCarr, Isabelle. <i>"Baited remote underwater video survey of macro-invertebrate distribution and abundance across False Bay, South Africa."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2014. http://hdl.handle.net/11427/12728en_ZA
dc.identifier.citationCarr, I. 2014. Baited remote underwater video survey of macro-invertebrate distribution and abundance across False Bay, South Africa. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Carr, Isabelle AB - Assessing invertebrate species diversity and distribution based on environmental predictors is essential for conservation planning. South Africa need to understand ecological patterns to better plan for species conservation. South Africa’s unique coastline requires additional protection, but the design of areas is reliant on evidence based research. South Africa has a distinctive marine environment and is host to tropical, subtropical and temperate invertebrate species. False Bay in the Western Cape province of South Africa is a biodiversity hotspot with high species richness due to the overlap of two bioregions. This project reports on the first comprehensive camera survey of False Bay’s invertebrate population and assesses diversity across more habitat types and a greater depth range than previous dredge studies. 154 sites were sampled across summer and winter, reef and sand and three depth categories: shallow (5-15 m), intermediate (16-30 m) and deep (31-50 m). A total of 67 species from 8 phyla were recorded in this study. Winter samples showed a greater diversity than those sampled in summer (p=0.004). Intermediate depths (Shannon-H=1.184) and reef substrate (Shannon-H=1.403) support a greater diversity of invertebrate species. Habitat emerged as the most significant predictor of species distribution in the bay (p=0.01). Depth (p=0.01) and season (p=0.03) were also of influence, but to a lesser extent. Reef sites were separated from sand sites by the presence of Jasus lalandii and Comanthus wahlbergi on the former and Bullia laevissima, Marthasterias glacialis and Ovalipes trimaculates on the latter. Reef species J. lalandii and Tropiometra carinata and sand species B. laevissima and M. glacialis had the greatest contribution to dissimilarity between winter and summer samples. Complex granite reefs should be a main priority in invertebrate conservation as they host the greatest species diversity and abundance of all habitats sampled. BRUVs have provided a non-invasive, non-destructive method of sampling invertebrate species on all habitat types and are recommended for use in future studies of invertebrate species composition. DA - 2014 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2014 T1 - Baited remote underwater video survey of macro-invertebrate distribution and abundance across False Bay, South Africa TI - Baited remote underwater video survey of macro-invertebrate distribution and abundance across False Bay, South Africa UR - http://hdl.handle.net/11427/12728 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/12728
dc.identifier.vancouvercitationCarr I. Baited remote underwater video survey of macro-invertebrate distribution and abundance across False Bay, South Africa. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2014 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/12728en_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.titleBaited remote underwater video survey of macro-invertebrate distribution and abundance across False Bay, South Africaen_ZA
dc.typeBachelor Thesis
dc.type.qualificationlevelHonours
dc.type.qualificationnameBSc (Hons)en_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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