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The major Australian cool temperate rainforest tree Nothofagus cunninghamii withstood Pleistocene glacial aridity within multiple regions: evidence from the chloroplast

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Worth, JRP and Jordan, GJ and McKinnon, GE and Vaillancourt, RE (2009) The major Australian cool temperate rainforest tree Nothofagus cunninghamii withstood Pleistocene glacial aridity within multiple regions: evidence from the chloroplast. New Phytologist, 182 (2). pp. 519-532. ISSN 0028-646X

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Abstract

 Glacial aridity of the Pleistocene was inhospitable for the cool temperate rainforest tree Nothofagus cunninghamii over most of its current range in southeastern Australia, particularly in eastern Tasmania. A chloroplast DNA phylogeographic study was undertaken to investigate whether this species was likely to have survived in situ or conforms to a dispersal model of postglacial recovery.  Twenty-three chloroplast haplotypes were identified by PCR-RFLP and direct sequencing of 2164 base pairs from 213 N. cunninghamii individuals collected in a range-wide survey. Fine-scale haplotype distribution was investigated using PCR-RFLP in eastern Tasmania.  Deep chloroplast divergence occurred in N. cunninghamii. The single haplotype of the sister species, N. moorei, was nested among N. cunninghamii haplotypes. The distribution of N. cunninghamii haplotypes supports: multiple glacial refugia in coastal and inland western Tasmania, the centre of haplotype diversity; glacial survival in the central highlands of Victoria, corroborating pollen data; and the long-term occupation of eastern Tasmania because of the presence of a unique deeply diverged chloroplast lineage.  N. cunninghamii withstood glacial aridity within multiple regions in apparently non-equable climates. This finding contributes to a growing understanding of how the resilience of temperate species during glacial periods has shaped modern biota.

Item Type: Article
Keywords: cryptic glacial refugia, cool temperate rainforest, deep phylogeography, fine-scale structure, N. moorei, northeast Tasmania, Pleistocene, Victorian central highlands
Journal or Publication Title: New Phytologist
Page Range: pp. 519-532
ISSN: 0028-646X
Identification Number - DOI: 10.1111/j.1469-8137.2008.02761.x
Additional Information: The original publication is available at http://www.interscience.wiley.com/
Date Deposited: 06 May 2009 05:27
Last Modified: 18 Nov 2014 03:58
URI: http://eprints.utas.edu.au/id/eprint/8670
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