Parvulastra exigua in South Africa: one species or more?

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dc.contributor.advisorGriffiths, Charles Len_ZA
dc.contributor.advisorVon der Heyden, Sophieen_ZA
dc.contributor.authorPayne, Robyn Pen_ZA
dc.date.accessioned2014-09-22T12:00:21Z
dc.date.available2014-09-22T12:00:21Z
dc.date.issued2013en_ZA
dc.description.abstractParvulastra exigua is a widely distributed and prominent member of the temperate intertidal fauna in the southern hemisphere, occurring along the southern coastline of Africa, southeastern Australia and several oceanic islands. In South Africa, it is found in sympatry with the endemic Parvulastra dyscrita and the two are differentiated predominantly by gonopore placement. P. exigua gives rise to distinct lecithotrophic benthic larvae that hatch from sticky egg masses laid via oral gonopores. In contrast, P. dyscrita has aboral gonopores that release eggs into the water column, from which pelagic larvae hatch. Several recent studies have suggested that there is a cryptic species of P. exigua in South Africa, based on genetic evidence or the differential placement of the gonopores. A morphological, anatomical and genetic investigation was performed on a total collection of 346 P. exigua and 8 P. dyscrita specimens from the east and west coast of South Africa, with the hope of confirming whether cryptic species and/or P. exigua specimens with aboral gonopores are present in the population and determining if they correlate. Neither the cryptic species, nor P. exigua specimens with aboral gonopores were obtained. This study tentatively refutes the claim of the existence of aboral gonopores in the South African P. exigua population, and the distinction between P. exigua and P. dyscrita is confirmed, with features separating these two species clarified.en_ZA
dc.identifier.apacitationPayne, R. P. (2013). <i>Parvulastra exigua in South Africa: one species or more?</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/7638en_ZA
dc.identifier.chicagocitationPayne, Robyn P. <i>"Parvulastra exigua in South Africa: one species or more?."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2013. http://hdl.handle.net/11427/7638en_ZA
dc.identifier.citationPayne, R. 2013. Parvulastra exigua in South Africa: one species or more?. University of Cape Town.en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Payne, Robyn P AB - Parvulastra exigua is a widely distributed and prominent member of the temperate intertidal fauna in the southern hemisphere, occurring along the southern coastline of Africa, southeastern Australia and several oceanic islands. In South Africa, it is found in sympatry with the endemic Parvulastra dyscrita and the two are differentiated predominantly by gonopore placement. P. exigua gives rise to distinct lecithotrophic benthic larvae that hatch from sticky egg masses laid via oral gonopores. In contrast, P. dyscrita has aboral gonopores that release eggs into the water column, from which pelagic larvae hatch. Several recent studies have suggested that there is a cryptic species of P. exigua in South Africa, based on genetic evidence or the differential placement of the gonopores. A morphological, anatomical and genetic investigation was performed on a total collection of 346 P. exigua and 8 P. dyscrita specimens from the east and west coast of South Africa, with the hope of confirming whether cryptic species and/or P. exigua specimens with aboral gonopores are present in the population and determining if they correlate. Neither the cryptic species, nor P. exigua specimens with aboral gonopores were obtained. This study tentatively refutes the claim of the existence of aboral gonopores in the South African P. exigua population, and the distinction between P. exigua and P. dyscrita is confirmed, with features separating these two species clarified. DA - 2013 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 2013 T1 - Parvulastra exigua in South Africa: one species or more? TI - Parvulastra exigua in South Africa: one species or more? UR - http://hdl.handle.net/11427/7638 ER - en_ZA
dc.identifier.urihttp://hdl.handle.net/11427/7638
dc.identifier.vancouvercitationPayne RP. Parvulastra exigua in South Africa: one species or more?. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 2013 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/7638en_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.titleParvulastra exigua in South Africa: one species or more?en_ZA
dc.typeBachelor Thesis
dc.type.qualificationlevelHonours
dc.type.qualificationnameBScen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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