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dc.contributorMilton, Suzanne J.
dc.contributorStellenbosch University. Faculty of AgriSciences. Dept. of Conservation Ecology and Entomology.
dc.contributor.authorKrug, Rainer Michael
dc.date.accessioned2019-10-22T11:33:45Z
dc.date.available2019-10-22T11:33:45Z
dc.date.created2016-09-05 23:27
dc.date.issued2008-06-18
dc.identifieroai:scholar.sun.ac.za:10019.1/1155
dc.identifierhttp://hdl.handle.net/10019.1/1155
dc.identifier.urihttp://hdl.handle.net/20.500.12424/717025
dc.description.abstractThesis (PhD (Conservation Ecology and Entomology))--Stellenbosch University, 2008.
dc.description.abstractDispersal plays an essential role in determining the distribution of populations of species,
 especially species expanding their ranges. Two disciplines are concerned with gaining
 understanding of spread of species, namely restoration ecology and invasion biology. Con-
 ceptual understanding of dispersal, its mechanisms and its management is essential to both
 disciplines. Nevertheless, the disciplines have quite opposite objectives: in restoration ecol-
 ogy, spread of indigenous species into transformed landscapes is promoted, while invasion
 biology aims to prevent the (further) spread of alien species into pristine or restored habi-
 tats. Despite these two opposite objectives of facilitating spread and preventing spread of
 their respective target species, these disciplines have essentially the same requirements in
 terms of information needed for restoration. In this thesis, I will present two modelling
 studies—one looking at the impact of two different seed-feeding alien control agents on
 the spread of Hakea sericea, the other investigating the recolonisation by Dicerothamnus
 rhinocerotis of an old field dominated by Cynodon dactylon. Based on these studies, I
 will draw conclusions for the management in each case. In a second step, I will compare
 these two seemingly-different studies and draw conclusions on how these two disciplines
 can learn from each other, and how conclusions drawn and management recommendations
 developed for the one discipline can be translated for the other. The invasion biology
 study concluded that seed-feeding biocontrol agents do have a considerable impact on the
 velocity of the spread of the target species. In addition, management recommendations
 included the possibility of substituting seed-feeding biocontrol agents with an increased
 fire frequency where the negative impact on natural vegetation, on the site invaded by the
 target species, is acceptable. The restoration study concluded that the main impact on the
 velocity of spread, and the speed of the return of the shrub species onto the old fields, is
 the availability of micro-sites. A sensitivity analysis showed the even a slight change from
 1% to 2% increases the velocity and pattern of spread dramatically. The other parameters
 playing an important role are the mean rate of establishment and the time span between
dc.languageen
dc.language.isoeng
dc.publisherStellenbosch : Stellenbosch University
dc.rightsStellenbosch University
dc.subjectSeed dispersal
dc.subjectEcological restoration
dc.subjectInvasion biology
dc.subjectEcological modelling
dc.subjectDissertations -- Conservation ecology and entomology
dc.subjectTheses -- Conservation ecology and entomology
dc.titleModelling seed dispersal in restoration and invasions
dc.typeThesis
ge.collectioncodeOAIDATA
ge.dataimportlabelOAI metadata object
ge.identifier.legacyglobethics:10255470
ge.identifier.permalinkhttps://www.globethics.net/gtl/10255470
ge.lastmodificationdate2016-09-05 23:27
ge.lastmodificationuseradmin@pointsoftware.ch (import)
ge.submissions0
ge.oai.exportid148900
ge.oai.repositoryid4407
ge.oai.setnameDepartment of Conservation Ecology and Entomology
ge.oai.setnameFaculty of AgriSciences
ge.oai.setnameDoctoral Degrees (Conservation Ecology and Entomology)
ge.oai.setspeccom_10019.1_19
ge.oai.setspeccom_10019.1_9
ge.oai.setspeccol_10019.1_531
ge.oai.streamid5
ge.setnameGlobeTheoLib
ge.setspecglobetheolib
ge.linkhttp://hdl.handle.net/10019.1/1155


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