Patterns of recruitment, growth and mortality of the mussel, Mytilus Galloprovincialis in relation to wave exposure and tidal elevation

 

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dc.contributor.advisor Branch, George M en_ZA
dc.contributor.author Leeb, Andrea en_ZA
dc.date.accessioned 2016-05-04T12:50:12Z
dc.date.available 2016-05-04T12:50:12Z
dc.date.issued 1995 en_ZA
dc.identifier.citation Leeb, A. 1995. Patterns of recruitment, growth and mortality of the mussel, Mytilus Galloprovincialis in relation to wave exposure and tidal elevation. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/19424
dc.description.abstract Population patterns of the alien mussel Mytilus galloprovincialis were investigated at two locations on the west coast of South Africa: Camps Bay and Groenrivier. Specifically, wave exposure and zonation were examined for their effect on mussel cover and total density, mussel size and recruit intensity. Two areas were compared at Camps Bay; the first was a prominent rock experiencing heavy wave action, and the second was a sheltered bay. Three areas were selected at Groenrivier, the third experiencing an intermediate gradient of wave action. A number of interesting patterns emerged, although not all were statistically significant. At both Camps Bay and Groenrivier mussel cover increased with increasing wave exposure and decreased with increasing tidal height. The exception to this zonational trend was exhibited in the very sheltered bay at Groenrivier, where mussel cover increased upshore, from 2% to 6%. Total mussel density and recruit intensity declined with a reduction in wave action at both locations. An unexpected zonational pattern occurred at both Camps Bay and Groenrivier - total densities tended to be greater upshore, a pattern which closely followed recruit densities. The maximum size achieved by mussels is greatest at more exposed areas, but the difference between sheltered and exposed regions at Camps Bay was not notable. Maximum shell size tended to decrease with increasing tidal height in all areas but the sheltered bay at Groenrivier, where little variation in maximum size occurred. Multivariate comparisons of population demography between all of the sites revealed that the sheltered site at Camps Bay was most similar to the semi-exposed site at Groenrivier, which points to similar environmental conditions in these areas. This pattern was repeated for total densities, a result which supports the previous suggestion. The sheltered bay at Groenrivier was most dissimilar in both demographic structure and density to all other sites. Bibliography: leave 89-99. en_ZA
dc.language.iso eng en_ZA
dc.subject.other Zoology en_ZA
dc.title Patterns of recruitment, growth and mortality of the mussel, Mytilus Galloprovincialis in relation to wave exposure and tidal elevation en_ZA
dc.type Thesis / Dissertation en_ZA
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 Masters en_ZA
dc.type.qualificationname MSc en_ZA
uct.type.filetype Text
uct.type.filetype Image


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