Biochemical and morphological systematics of the Southern African gastropod genera Burnupena (Buccinidae) and Oxystele (Trochidae)

 

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dc.contributor.advisor Branch, George M en_ZA
dc.contributor.author Dempster, Yvonne Laura en_ZA
dc.date.accessioned 2014-10-17T07:33:31Z
dc.date.available 2014-10-17T07:33:31Z
dc.date.issued 1995 en_ZA
dc.identifier.citation Dempster, Y. 1995. Biochemical and morphological systematics of the Southern African gastropod genera Burnupena (Buccinidae) and Oxystele (Trochidae). University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/8496
dc.description Includes bibliographies. en_ZA
dc.description.abstract Gastropods of the genus Burnupena are very common rocky-shore whelks endemic to the Southern African region. However, despite recent revisions of the genus, difficulties in identification persist, due mainly to the occurrence of phenotypic intermediates between sympatric species. Samples of Burnupena were collected from 17 sites along the coast of South Africa. Variation in shell morphology was examined using multivariate analyses. The results revealed that the degree of variation within species is very high, and that shell form and colour can be influenced by local environmental conditions. Nevertheless, most populations of the individual species clustered together. Morphological differences between species were small, although distinctions could be discerned, with not all species being confused with all other species. However, on the basis of morphology, there will always be a few individuals which will remain difficult to identify. Examination of the radulae from all of the species of Burnupena using both light and electron microscopy showed that the radula is of little or no practical value in distinguishing between species. Whilst some differences could be detected in some characters, these were not consistent, either within or between species. However, the radula is diagnostic at the generic level. The populations of Burnupena were analysed for allozyme variation at 25 loci. Variation within species was high, and in all of the species, significant population differentiation was obseNed. A significant correlation between genetic and geographic distance was found. Nei's genetic distances within species were low (means per species ranging from 0.01 to 0.05), and the populations of each species clustered together. Unlike their morphological differences, the species were mostly well differentiated genetically, with Nei's distances between species ranging from 0.1 to 1.45. Compared to the other species, B. cincta and B. lagenaria were relatively little differentiated from each other. B. catarrhacta was strongly differentiated from all of the other species. Comparisons between sympatric populations suggested complete reproductive isolation between the species. en_ZA
dc.language.iso eng
dc.subject.other Zoology en_ZA
dc.title Biochemical and morphological systematics of the Southern African gastropod genera Burnupena (Buccinidae) and Oxystele (Trochidae) 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 Dempster, Y. L. (1995). <i>Biochemical and morphological systematics of the Southern African gastropod genera Burnupena (Buccinidae) and Oxystele (Trochidae)</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/8496 en_ZA
dc.identifier.chicagocitation Dempster, Yvonne Laura. <i>"Biochemical and morphological systematics of the Southern African gastropod genera Burnupena (Buccinidae) and Oxystele (Trochidae)."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1995. http://hdl.handle.net/11427/8496 en_ZA
dc.identifier.vancouvercitation Dempster YL. Biochemical and morphological systematics of the Southern African gastropod genera Burnupena (Buccinidae) and Oxystele (Trochidae). [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1995 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/8496 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Dempster, Yvonne Laura AB - Gastropods of the genus Burnupena are very common rocky-shore whelks endemic to the Southern African region. However, despite recent revisions of the genus, difficulties in identification persist, due mainly to the occurrence of phenotypic intermediates between sympatric species. Samples of Burnupena were collected from 17 sites along the coast of South Africa. Variation in shell morphology was examined using multivariate analyses. The results revealed that the degree of variation within species is very high, and that shell form and colour can be influenced by local environmental conditions. Nevertheless, most populations of the individual species clustered together. Morphological differences between species were small, although distinctions could be discerned, with not all species being confused with all other species. However, on the basis of morphology, there will always be a few individuals which will remain difficult to identify. Examination of the radulae from all of the species of Burnupena using both light and electron microscopy showed that the radula is of little or no practical value in distinguishing between species. Whilst some differences could be detected in some characters, these were not consistent, either within or between species. However, the radula is diagnostic at the generic level. The populations of Burnupena were analysed for allozyme variation at 25 loci. Variation within species was high, and in all of the species, significant population differentiation was obseNed. A significant correlation between genetic and geographic distance was found. Nei's genetic distances within species were low (means per species ranging from 0.01 to 0.05), and the populations of each species clustered together. Unlike their morphological differences, the species were mostly well differentiated genetically, with Nei's distances between species ranging from 0.1 to 1.45. Compared to the other species, B. cincta and B. lagenaria were relatively little differentiated from each other. B. catarrhacta was strongly differentiated from all of the other species. Comparisons between sympatric populations suggested complete reproductive isolation between the species. DA - 1995 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1995 T1 - Biochemical and morphological systematics of the Southern African gastropod genera Burnupena (Buccinidae) and Oxystele (Trochidae) TI - Biochemical and morphological systematics of the Southern African gastropod genera Burnupena (Buccinidae) and Oxystele (Trochidae) UR - http://hdl.handle.net/11427/8496 ER - en_ZA


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