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

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dc.contributor.advisorMoll, Eugene Jen_ZA
dc.contributor.authorHolmes, P Men_ZA
dc.date.accessioned2016-03-14T07:22:13Z
dc.date.available2016-03-14T07:22:13Z
dc.date.issued1989en_ZA
dc.descriptionIncludes bibliographies.en_ZA
dc.description.abstractThe 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.identifier.apacitationHolmes, 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/11427/17724en_ZA
dc.identifier.chicagocitationHolmes, 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/11427/17724en_ZA
dc.identifier.citationHolmes, P. 1989. A comparative study of the seed bank dynamics of two congeneric alien invasive species. University of Cape Town.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
dc.identifier.urihttp://hdl.handle.net/11427/17724
dc.identifier.vancouvercitationHolmes 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/11427/17724en_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.subject.otherBotanyen_ZA
dc.subject.otherAcacia - South Africa - Seedsen_ZA
dc.subject.otherPlant introduction - South Africaen_ZA
dc.subject.otherSoil seed banks - South Africaen_ZA
dc.titleA comparative study of the seed bank dynamics of two congeneric alien invasive speciesen_ZA
dc.typeDoctoral Thesis
dc.type.qualificationlevelDoctoral
dc.type.qualificationnamePhDen_ZA
uct.type.filetypeText
uct.type.filetypeImage
uct.type.publicationResearchen_ZA
uct.type.resourceThesisen_ZA
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