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dc.contributor.advisorMagurran, Anne E.
dc.contributor.authorRocha Kortz, Alessandra
dc.coverage.spatialxiii, 305 p.en_US
dc.description.abstractHow do newly established species interact with existing assemblage members to alter local biodiversity? This question is especially topical given growing concerns about increased temporal turnover levels relative to background rates. My PhD thesis concerns young, isolated pines Pinus elliottii invading the Cerrado (Brazilian savanna) as a study system to test the hypothesis that the impact of newly established individuals varies across habitat layers. I sampled both vegetation layers (shrub and grass) of two distinct habitats, the shrub-dominated campo sujo and the grass-dominated campo úmido. My results show that the pine is changing α diversity in the dominant vegetation layer of each habitat: the shrub layer of campo sujo and the grass layer of campo úmido. The shape of the diversity v. establishment time relationship is habitat dependent; there is a hump shaped relationship between diversity and pine size in the grass layer but a linear one in the shrub layer. β diversity metrics – which take species composition into account - reveal marked differences in species composition between the habitats in the shrub layer, whereas the corresponding pair of invaded and control sites of the same habitat and layer is more similar than expected (in both vegetation layers). The degree of similarity between sites also changes as the invasion proceeds. In the campo sujo habitat, sites become more compositionally distinct, whereas in the grass layer of campo úmido sites get more similar. This suggests that the timing of changes in species composition is habitat-dependent and reinforces the need to remove the invader individuals from the area. My results show that, though complex, the consequences for local biodiversity of non-native species establishment are not haphazard. As such they contribute to the understanding of species coexistence and help explain why species invasion can lead to very different biodiversity outcomes.en_US
dc.description.sponsorship"My PhD was funded by the Brazilian Science Without Borders Program (Ciência sem Fronteiras) and by the Coordenação de Aprimoramento de Pessoal de Nível Superior (CAPES) (1091/13-1). My work has also benefited from the funding from the School of Biology – for fieldwork assistance as well as presenting my work at British Ecological Society Annual Meetings (2015 and 2016) and at the Macroecology of Alien Species Symposium (2017). I am grateful for the Sir Murray Ken prize, which partially covered the expenses for me to present at the II International Symposium of Ecology (2016)." -- Acknowledgementsen
dc.publisherUniversity of St Andrewsen
dc.rightsAttribution-NonCommercial-NoDerivatives 4.0 International*
dc.subjectBiological diversityen_US
dc.subjectCommunity ecologyen_US
dc.subjectHabitat structureen_US
dc.subjectInvasion impacten_US
dc.subjectPinus elliottiien_US
dc.subject.lcshIntroduced organismsen
dc.subject.lcshForest ecologyen
dc.titleBiodiversity change in the Cerrado following invasive pine tree establishmenten_US
dc.contributor.sponsorConselho Nacional de Desenvolvimento Científico e Tecnológico. Ciência sem Fronteirasen_US
dc.contributor.sponsorBrazil. Coordenação do Aperfeiçoamento de Pessoal de Nível Superior (CAPES)en_US
dc.type.qualificationnamePhD Doctor of Philosophyen_US
dc.publisher.institutionThe University of St Andrewsen_US
dc.rights.embargoreasonThesis restricted in accordance with University regulations. Print and electronic copy restricted until 1st November 2019en

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