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    Shared phylogeographic patterns and widespread chloroplast haplotype sharing in Eucalyptus species with different ecological tolerances

    Access Status
    Fulltext not available
    Authors
    Nevill, Paul
    Després, T.
    Bayly, M.
    Bossinger, G.
    Ades, P.
    Date
    2014
    Type
    Journal Article
    
    Metadata
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    Citation
    Nevill, P. and Després, T. and Bayly, M. and Bossinger, G. and Ades, P. 2014. Shared phylogeographic patterns and widespread chloroplast haplotype sharing in Eucalyptus species with different ecological tolerances. Tree Genetics and Genomes. 10 (4): pp. 1079-1092.
    Source Title
    Tree Genetics and Genomes
    DOI
    10.1007/s11295-014-0744-y
    ISSN
    1614-2942
    School
    Department of Environment and Agriculture
    URI
    http://hdl.handle.net/20.500.11937/13170
    Collection
    • Curtin Research Publications
    Abstract

    We examined the phylogeography of three south-east Australian trees (Eucalyptus delegatensis, Eucalyptus obliqua, and Eucalyptus regnans) with different tolerances, in terms of cold, drought, fire and soil to explore whether species with different ecologies share major phylogeographic patterns. A second aim of this study was to examine geographic patterns of chloroplast DNA (cpDNA) haplotype sharing among the three study species. Trees of E. delegatensis (n = 120), E. obliqua (n = 265) and E. regnans (n = 270) were genotyped with five cpDNA microsatellite markers. The species shared major phylogeographic disjunctions, and common patterns at proposed glacial refugia (generally high haplotype diversity) and areas thought to have been treeless during the Last Glacial Maximum (LGM) (low diversity). Inter-specific sharing of haplotypes was extensive, and fixation of shared, regional haplotypes was more frequent in areas postulated as having been treeless at the LGM. Despite ecological differences, chloroplast microsatellite data suggest the three species have responded to past climatic changes in a similar way, by persisting in multiple, generally common refugia. We suggest that the natural ability of eucalypt species to hybridise with others with quite different or broader ecological tolerances may provide an "insurance policy" for response to rapidly changing abiotic conditions.

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