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    Fine-scale patterns of species and phylogenetic turnover in a global biodiversity hotspot: Implications for climate change vulnerability

    Access Status
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    Authors
    Sander, Juliane
    Wardell-Johnson, Grant
    Date
    2011
    Type
    Journal Article
    
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    Citation
    Sander, Juliane and Wardell-Johnson, Grant. 2011. Fine-scale patterns of species and phylogenetic turnover in a global biodiversity hotspot: Implications for climate change vulnerability. Journal of Vegetation Science. 22 (5): pp. 766-780.
    Source Title
    Journal of Vegetation Science
    DOI
    10.1111/j.1654-1103.2011.01293.x
    ISSN
    1100-9233
    School
    Department of Environment and Agriculture
    URI
    http://hdl.handle.net/20.500.11937/37211
    Collection
    • Curtin Research Publications
    Abstract

    Question: What is the relative importance of environmental and spatial factors for species compositional and phylogenetic turnover? Location: High-rainfall zone of the Southwest Australian Floristic Region (SWAFR). Methods: Correlates of species compositional turnover were assessed using quadrat-based floristic data, and establishing relationships with environmental and spatial factors using canonical correspondence analyses and Mantel tests. Between-quadrat phylogenetic distance measures were computed and examined for correlations with environmental and spatial attributes. Processes structuring patterns of beta diversity were also evaluated within four broad floristic assemblages defined a priori. Results: Floristic diversity was strongly related to environmental attributes. A low significance of spatial variables on assemblage patterns suggested no evident effect of dispersal limitations. Species compositional turnover was especially high within the swamp and outcrop assemblage. Phylogenetic turnover was closely coupled to species compositional turnover, implying the occurrence of many locally endemic and phylogenetically relict taxa. Beta diversity patterns within assemblages were also significantly correlated with the local environment, and relevant correlates differed between floristic assemblage types.Conclusion: Phylogenetic diversity in the SWAFR high-rainfall zone is clustered within edaphic microhabitats in a generally subdued landscape. A clustered rather than dispersed distribution of phylogenetic diversity increases the probability of significant plant diversity loss during periods of climate change. Climate change susceptibility of the region's flora is accordingly estimated to be high. We highlight the conservation significance of swamp and outcrops that are characterized by distinct hydrological properties and may provide refugial habitat for plant diversity during periods of moderate climate change.

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