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Chloroplast evidence for geographic stasis of the Australian bird-dispersed shrub Tasmannia lanceolata (Winteraceae)


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Worth, JRP, Jordan, GJ, Marthick, JR, McKinnon, GE and Vaillancourt, RE 2010 , 'Chloroplast evidence for geographic stasis of the Australian bird-dispersed shrub Tasmannia lanceolata (Winteraceae)' , Molecular Ecology, vol. 19, no. 14 , pp. 2949-2963 , doi: 10.1111/j.1365-294X.2010.04725.x.

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Few chloroplast-based genetic studies have been undertaken for plants of mesic
temperate forests in the southern hemisphere and fossil-based models have provided
evidence of vegetation history only at the broadest scales in this region. This study
investigates the chloroplast DNA phylogeography of Tasmannia lanceolata (Winteraceae),
a fleshy-fruited, bird-dispersed shrub that is widespread in the mountains of
southeastern Australia and Tasmania. Thirty haplotypes were identified after sequencing
3206 bp of chloroplast DNA in each of 244 individuals collected across the species’
range. These haplotypes showed unexpectedly strong phylogeographic structuring,
including a phylogeographic break within a continuous part of the species’ range, with
the distribution of four major clades mostly not overlapping, and geographic structuring
of haplotypes within these clades. This strong geographic patterning of chloroplast DNA
provided evidence for the survival of T. lanceolata in multiple putative wet forest refugia
as well as evidence for additional wet forest species refugia in southeastern Australia. In
western Tasmania lower haplotype diversity below the LGM tree line compared to above
the LGM tree line suggests that glacial refugia at high altitudes may have been important
for T. lanceolata. The level of geographic structuring in T. lanceolata is similar to gravity
dispersed southern hemisphere plants such as Nothofagus and Eucalyptus. Behavioural
traits of the birds transporting seed may have had a strong bearing on the limited
transport of T. lanceolata seed, although factors limiting establishment, possibly
including selection, may also have been important.

Item Type: Article
Authors/Creators:Worth, JRP and Jordan, GJ and Marthick, JR and McKinnon, GE and Vaillancourt, RE
Keywords: chloroplast DNA, fleshy fruit, glacial refugia, phylogeographic break, widespread, Winteraceae
Journal or Publication Title: Molecular Ecology
ISSN: 0962-1083
DOI / ID Number: 10.1111/j.1365-294X.2010.04725.x
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