A comparative study of the seed bank dynamics of two congeneric alien invasive species

 

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dc.contributor.advisor Moll, Eugene J en_ZA
dc.contributor.author Holmes, P M en_ZA
dc.date.accessioned 2016-03-14T07:22:13Z
dc.date.available 2016-03-14T07:22:13Z
dc.date.issued 1989 en_ZA
dc.identifier.citation Holmes, P. 1989. A comparative study of the seed bank dynamics of two congeneric alien invasive species. University of Cape Town. en_ZA
dc.identifier.uri http://hdl.handle.net/11427/17724
dc.description Includes bibliographies. en_ZA
dc.description.abstract The unique vegetation in the lowlands of the fynbos biome is threatened by alien Acacia encroachment. The seed bank dynamics of the two most widespread invaders in the region, Acacia saligma and A. cyclops, was studied to elucidate those factors contributing most to their invasive success. This information was then used to assist in developing optimal control methods. On the basis of information available prior to this study, it was predicted that both species would have large, persistent seed banks in the so.il, and that seed bank processes would provide the - key to invasive success: namely, high seed longevity and heat-stimulated germination. Seed banks were monitored for several years following clearing of the parent stand, using either sites sampled in an earlier study, or sites providing chronosequences of clearing dates. Concurrently, a demographic study of the species' seed banks, including processes from seed rain through to seedling emergence and survival, was done in dense Acacia stands and in fynbos vegetation. Acacia saligma seed banks conformed to predictions, being large and persistent owing to high percentage viability and water-impermeable dormancy. Seed banks accumulate rapidly under dense stands and are "disturbance-coupled" as they have potentially high longevity unless stimulated to germinate by fire. Although A. cyclops seed banks also may be large and long-lived, they display variable percentage viability and dormancy, with the majority of a seed cohort surviving less than a year. Acacia cyclops seed banks do not respond to heat treatment and appear to be "disturbance-uncoupled". en_ZA
dc.language.iso eng en_ZA
dc.subject.other Botany en_ZA
dc.subject.other Acacia - South Africa - Seeds en_ZA
dc.subject.other Plant introduction - South Africa en_ZA
dc.subject.other Soil seed banks - South Africa en_ZA
dc.title A comparative study of the seed bank dynamics of two congeneric alien invasive species 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 Holmes, P. M. (1989). <i>A comparative study of the seed bank dynamics of two congeneric alien invasive species</i>. (Thesis). University of Cape Town ,Faculty of Science ,Department of Biological Sciences. Retrieved from http://hdl.handle.net/11427/17724 en_ZA
dc.identifier.chicagocitation Holmes, P M. <i>"A comparative study of the seed bank dynamics of two congeneric alien invasive species."</i> Thesis., University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1989. http://hdl.handle.net/11427/17724 en_ZA
dc.identifier.vancouvercitation Holmes PM. A comparative study of the seed bank dynamics of two congeneric alien invasive species. [Thesis]. University of Cape Town ,Faculty of Science ,Department of Biological Sciences, 1989 [cited yyyy month dd]. Available from: http://hdl.handle.net/11427/17724 en_ZA
dc.identifier.ris TY - Thesis / Dissertation AU - Holmes, P M AB - The unique vegetation in the lowlands of the fynbos biome is threatened by alien Acacia encroachment. The seed bank dynamics of the two most widespread invaders in the region, Acacia saligma and A. cyclops, was studied to elucidate those factors contributing most to their invasive success. This information was then used to assist in developing optimal control methods. On the basis of information available prior to this study, it was predicted that both species would have large, persistent seed banks in the so.il, and that seed bank processes would provide the - key to invasive success: namely, high seed longevity and heat-stimulated germination. Seed banks were monitored for several years following clearing of the parent stand, using either sites sampled in an earlier study, or sites providing chronosequences of clearing dates. Concurrently, a demographic study of the species' seed banks, including processes from seed rain through to seedling emergence and survival, was done in dense Acacia stands and in fynbos vegetation. Acacia saligma seed banks conformed to predictions, being large and persistent owing to high percentage viability and water-impermeable dormancy. Seed banks accumulate rapidly under dense stands and are "disturbance-coupled" as they have potentially high longevity unless stimulated to germinate by fire. Although A. cyclops seed banks also may be large and long-lived, they display variable percentage viability and dormancy, with the majority of a seed cohort surviving less than a year. Acacia cyclops seed banks do not respond to heat treatment and appear to be "disturbance-uncoupled". DA - 1989 DB - OpenUCT DP - University of Cape Town LK - https://open.uct.ac.za PB - University of Cape Town PY - 1989 T1 - A comparative study of the seed bank dynamics of two congeneric alien invasive species TI - A comparative study of the seed bank dynamics of two congeneric alien invasive species UR - http://hdl.handle.net/11427/17724 ER - en_ZA


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