Glacial refugia and reticulate evolution: the case of the Tasmanian eucalypts

G E McKinnon; G J Jordan; R E Vaillancourt; Dorothy A Steane; Brad M Potts

doi:10.1098/rstb.2003.1391

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Glacial refugia and reticulate evolution: the case of the Tasmanian eucalypts

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Glacial refugia and reticulate evolution: the case of the Tasmanian eucalypts

G E McKinnon, G J Jordan, R E Vaillancourt, Dorothy A Steane and Brad M Potts

Philosophical transactions of the Royal Society of London. Series B, Biological sciences, Vol.359(1442), pp.275-284

2004

DOI: https://doi.org/10.1098/rstb.2003.1391

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Abstract

Biological Sciences

Medical and Health Sciences

glacial refugia

eucalyptus

chloroplast

phylogeography

hybrid

Tasmania

Tasmania is a natural laboratory for investigating the evolutionary processes of the Quaternary. It is a large island lying 40–44° S, which was repeatedly glaciated and linked to southeastern continental Australia during the Quaternary. Climate change promoted both the isolation of species in glacial refugia, and an exchange between Tasmanian and mainland floras. Eucalyptus is a complex and diverse genus, which has increased in abundance in Australia over the past 100 kyr, probably in response to higher fire frequency. Morphological evidence suggests that gene flow may have occurred between many eucalypt species after changes in their distribution during the Quaternary. This paper summarizes recent genetic evidence for migration and introgressive hybridization in Tasmanian Eucalyptus. Maternally inherited chloroplast DNA reveals a long–term persistence of eucalypts in southeastern Tasmanian refugia, coupled with introgressive hybridization involving many species. Detailed analysis of the widespread species Eucalyptus globulus suggests that migration from mainland Australia was followed by introgression involving a rare Tasmanian endemic. The data support the hypothesis that changes in distribution of interfertile species during the Quaternary have promoted reticulate evolution in Eucalyptus.

Details

Title: Glacial refugia and reticulate evolution: the case of the Tasmanian eucalypts
Authors: G E McKinnon (Author) - University of Tasmania
G J Jordan (Author) - University of Tasmania
R E Vaillancourt (Author) - University of Tasmania
Dorothy A Steane (Author) - University of Tasmania
Brad M Potts (Author) - University of Tasmania
Publication details: Philosophical transactions of the Royal Society of London. Series B, Biological sciences, Vol.359(1442), pp.275-284
Publisher: Royal Society Publishing
Date published: 2004
DOI: 10.1098/rstb.2003.1391
ISSN: 0962-8436
Organisation Unit: University of the Sunshine Coast, Queensland
Language: English
Record Identifier: 99450257702621
Output Type: Journal article

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