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Australian Journal of Botany Australian Journal of Botany Society
Southern hemisphere botanical ecosystems
RESEARCH ARTICLE

The origins and evolutionary history of xerophytic vegetation in Australia

Margaret Byrne https://orcid.org/0000-0002-7197-5409 A C and Daniel J. Murphy https://orcid.org/0000-0002-8358-363X B
+ Author Affiliations
- Author Affiliations

A Biodiversity and Conservation Science, Department of Biodiversity, Conservation and Attractions, Locked Bag 104, Bentley Delivery Centre, WA 6983, Australia.

B Royal Botanic Gardens Victoria, Birdwood Avenue, Melbourne, Vic. 3004, Australia.

C Corresponding author. Email: margaret.byrne@dbca.wa.gov.au

Australian Journal of Botany 68(3) 195-207 https://doi.org/10.1071/BT20022
Submitted: 24 February 2020  Accepted: 19 June 2020   Published: 28 July 2020

Abstract

The xeromorphic vegetation is a significant component of the Australian flora and phylogenetic and phylogeographic analysis of xeromorphic plants provides a basis for understanding the origins and evolutionary history of the Australian vegetation. Here we expand on previous reviews of the origins and maintenance of the Australian flora with an emphasis on the xeromorphic component. Phylogenetic evidence supports fossil evidence for evolution of sclerophyll and xeromorphic vegetation from the Eocene with lineages becoming more common in the Oligocene and Miocene, a time of major change in climate and vegetation in Australia. Phylogenetic evidence supports the mesic biome as ancestral to the arid zone biome in Australia in phylogenies of key groups. The diversification and radiation of Australian species shows single origins of xeromorphic group mainly at deeper levels in phylogenies as well as multiple origins of arid occurring species at shallower levels. Divergence across the Nullarbor is also evident and speciation rates in south-western Australia were higher than in the south-east in several plant families. Estimates of timing of diversification generally show either constant rates of diversification or increased diversification from the mid to late Miocene. Phylogeographic studies consistently demonstrate high localised genetic diversity and geographic structure in xeromorphic species occupying both mesic and arid biomes.

Additional keywords: arid, diversification, mesic, phylogeny, phylogeography, sclerophyll, speciation.


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