Show simple item record

dc.contributor.authorUys, Charmaine J.
dc.date.accessioned2014-05-05T10:36:00Z
dc.date.available2014-05-05T10:36:00Z
dc.date.created2011en
dc.date.issued2014-05-05T10:36:00Z
dc.identifier.urihttp://hdl.handle.net/123456789/1406
dc.description.abstractWhile the Cape Peninsula (South Africa) is renowned for its exceptional plant and invertebrate diversity and endemism, extensive alien plant invasion and exotic pine plantations reduce native species richness, and may facilitate alien invertebrate invasions. This study examines the impact of planting and felling pine on litter invertebrate communities, by comparing invertebrate diversity and faunal exchange between pine plantations and two types of native vegetation (Afrotemperate forest and fynbos). Impacts of the worst invasive alien invertebrate (Argentine ant, Linepithema humile) and other alien invertebrate species are investigated. This is one of the first attempts to inventory and quantify impacts of non-ant alien invertebrates in Table Mountain National Park. The entire ground-dwelling invertebrate community was sampled at 31 sites in summer 2008/2009, using soil cores, leaf litter samples, pitfall traps, sugar-baited ant traps, and decayed logs. A total of 112 404 individuals representing 728 species (10 classes and 38 orders), including nine Cape Peninsula endemic and 19 alien invertebrate species, was collected. Pine plantations supported lower species richness and abundance, and different community assemblages, compared to Afrotemperate forest, but similar species richness to fynbos. Pine plantations shared fewer species with fynbos than forest, thus negatively affected fynbos-specialist invertebrates, because afforestation reduces available fynbos habitat. Alien species richness was similar across habitats. Argentine ants, like most other alien species identified, were present in all habitats, but were the most abundant ant species at only four forest, two fynbos and two pine plantation sites. The impact of Argentine ant invasion on native ant communities was evaluated using species richness and community composition analyses, the functional group approach, and species co-occurrence patterns, and provided evidence for displacement, impoverishment, and community disassembly. No clear impacts of the 18 non-ant alien species on the abundance, species richness, or community composition of corresponding native taxa were detected. However, carnivorous molluscs and European wasps (Vespula germanica) require careful monitoring. Using a reiterative process, ant species and functional groups were selected as the best ecological indicators of restoration progress in fynbos following clear-felling of pine. These findings have application to other Mediterranean-type ecosystems impacted by exotic pine.en
dc.description.statementofresponsibilityGriffiths, Charles L.
dc.format.extent1443613 bytes
dc.format.mimetypeapplication/pdf
dc.languageEnglishen
dc.language.isoen_US
dc.rightscopyrighten
dc.subjectinvasive woody plantsen
dc.titleInvasive woody plants: a double-edged sword for invertebrate conservationen
dc.mdidentification.purposeSubmitted for the Degree of DOCTOR OF PHILOSOPHY in the Department of 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.usagedatetime2011-01
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
dc.exverticalextent.maximumvaluen/aen
dc.exverticalextent.unitofmeasuremetersen
dc.cibprojectNAen


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record