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dc.contributor.authorLado, Thomas F.
dc.date.accessioned2014-05-05T10:40:30Z
dc.date.available2014-05-05T10:40:30Z
dc.date.created2008en
dc.date.issued2014-05-05T10:40:30Z
dc.identifier.urihttp://hdl.handle.net/123456789/1411
dc.description.abstractIntroduced species displace native species and alter ecological communities, affect agriculture as well as human health and are economically costly to eradicate. Long term monitoring of introduced species including the documentation of levels of genetic variation is therefore of the utmost importance. This study investigated the distribution of genetic variation in two introduced species distributed across South Africa the bud gall-forming wasp Trichilogaster acaciaelongifoliae and the Argentine ant Linepithema humile. The bud gall-forming wasp was introduced into South Africa as a biological control agent to curb the spread of the invasive long-leaved wattle Acacia longifolia. In addition to the intended (target) host, the bud gall-forming wasp has also colonised A. floribunda, a noninvasive ornamental plant. Limited genetic variation was found across South Africa based on the mitochondrial DNA cytochrome oxidase subunit I (COI) gene. Only 3 haplotypes characterized 53 individuals collected from 23 localities (nucleotide diversity π = 0.002 ± 0.001, haplotype diversity h = 0.482 ± 0.045). No significant partitioning of genetic variation was found across South Africa including between host plants (target host = A. longifolia, non target host = A. floribunda) or between the core (sites of introduction) and edge (naturally dispersed) sites (ST = 0.094, P = 0.288). The limited genetic variation and the absence of significant genetic structure are congruent with patterns described for many other introduced species and may suggest that propagule pressure plays only a minor role in species establishment and spread of the gall-forming wasp across South Africa.en
dc.description.statementofresponsibilityChown, Steven L.
dc.format.extent1343449 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen
dc.language.isoen_US
dc.rightscopyrighten
dc.subjectbud gall-forming waspen
dc.subjectTrichilogaster acaciaelongifoliaeen
dc.subjectArgentine anten
dc.subjectLinepithema humileen
dc.titleMolecular Ecology of Introduced Species in South Africa: The bud gall-forming wasp Trichilogaster acaciaelongifoliae and the Argentine ant Linepithema humileen
dc.mdidentification.purposeSubmitted in fulfilment of the requirements for the degree of Doctor of Philosophy in the Department of Botany and Zoologyen
dc.mdidentification.organizationnameCentre of Excellence for Invasion Biologyen
dc.mdidentification.deliverypointFaculty of Science, Natural Sciences Building, Private Bag X1, Stellenbosch University, Matielanden
dc.mdidentification.postalcode7602en
dc.mdidentification.phone0218082832en
dc.mdidentification.electronicmailaddresskcd@sun.ac.zaen
dc.mddataidentification.languageEnglishen
dc.mdusage.usagedatetime2008-11
dc.mdlegalconstraints.accessconstraintscopyrighten
dc.dqcompletenessomission.valueunitPercentageen
dc.mdmaintenanceinformation.maintenanceandupdatefrequencyUnknownen
dc.mdfeaturecataloguedescription.cataloguedate2014-04-25
dc.mddistributor.distributorcontactCentre for Invasion Biologyen
dc.mdformat.namePDFen
dc.exgeographicboundingbox.westboundlongituden/aen
dc.exgeographicboundingbox.eastboundlongituden/aen
dc.exgeographicboundingbox.northboundlattituden/aen
dc.exgeographicboundingbox.southboundlattituden/aen
dc.exverticalextent.minimumvaluen/aen
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dc.exverticalextent.unitofmeasuremetersen
dc.cibprojectNAen


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