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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, Jordan, GJ, 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, vol. 182, no. 2 , pp. 519-532 , doi: 10.1111/j.1469-8137.2008.02761.x.

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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
Authors/Creators:Worth, JRP and Jordan, GJ and McKinnon, GE and Vaillancourt, RE
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
ISSN: 0028-646X
DOI / ID Number: 10.1111/j.1469-8137.2008.02761.x
Additional Information:

The original publication is available at
http://www.interscience.wiley.com/

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