Radiation of the Australian flora: What can comparisons of molecular phylogenies across multiple taxa tell us about the evolution of diversity in present-day communities?

Crisp, Michael D., Cook, Lyn G. and Steane, Dorothy A. (2004). Radiation of the Australian flora: What can comparisons of molecular phylogenies across multiple taxa tell us about the evolution of diversity in present-day communities?. In: Philosophical Transactions of The Royal Society of London: Biological Sciences. Plant Phylogeny and the Origin of Major Biomes. Discussion Meeting on Plant Phylogeny and the Origin of Major Biomes, London, U.K., (1551-1571). 15-16 March 2004. doi:10.1098/rstb.2004.1528


Author Crisp, Michael D.
Cook, Lyn G.
Steane, Dorothy A.
Title of paper Radiation of the Australian flora: What can comparisons of molecular phylogenies across multiple taxa tell us about the evolution of diversity in present-day communities?
Conference name Discussion Meeting on Plant Phylogeny and the Origin of Major Biomes
Conference location London, U.K.
Conference dates 15-16 March 2004
Proceedings title Philosophical Transactions of The Royal Society of London: Biological Sciences. Plant Phylogeny and the Origin of Major Biomes   Check publisher's open access policy
Journal name Philosophical Transactions of the Royal Society of London Series B-Biological Sciences   Check publisher's open access policy
Place of Publication London, U.K.
Publisher The Royal Society Publishing
Publication Year 2004
Sub-type Fully published paper
DOI 10.1098/rstb.2004.1528
ISSN 0962-8436
1471-2970
Volume 359
Issue 1450
Start page 1551
End page 1571
Total pages 21
Language eng
Abstract/Summary The Australian fossil record shows that from ca. 25 Myr ago, the aseasonal-wet biome (rainforest and wet heath) gave way to the unique Australian sclerophyll biomes dominated by eucalypts, acacias and casuarinas. This transition coincided with tectonic isolation of Australia, leading to cooler, drier, more seasonal climates. From 3 Myr ago, aridification caused rapid opening of the central Australian and zone. Molecular phylogenies with dated nodes have provided new perspectives on how these events could have affected the evolution of the Australian flora. During the Mid-Cenozoic (25-10 Myr ago) period of climatic change, there were rapid radiations in sclerophyll taxa, such as Banksia, eucalypts, pea-flowered legumes and Allocasuarina. At the same time, taxa restricted to the aseasonal-wet biome (Nothofagus, Podocarpaceae and Araucariaceae) did not radiate or were depleted by extinction. During the Pliocene aridification, two Eremean biome taxa (Lepidium and Chenopodiaceae) radiated rapidly after dispersing into Australia from overseas. It is clear that the biomes have different histories. Lineages in the aseasonal-wet biome are species poor, with sister taxa that are species rich, either outside Australia or in the sclerophyll biomes. In conjunction with the fossil record, this indicates depletion of the Australian aseasonal-wet biome from the Mid-Cenozoic. In the sclerophyll biomes, there have been multiple exchanges between the southwest and southeast, rather than single large endemic radiations after a vicariance event. There is need for rigorous molecular phylogenetic studies so that additional questions can be addressed, such as how interactions between biomes may have driven the speciation process during radiations. New studies should include the hither-to neglected monsoonal tropics.
Subjects 06 Biological Sciences
Keyword Biology
Australia
Molecular dating
Climate change
Cenozoic
Rapid radiation
Extinction
Chloroplast Dna phylogeny
Rbcl gene-sequences
Subtribe Dendrobiinae Orchidaceae
Estimating divergence times
New-Zealand
Nothofagus nothofagaceae
Historical biogeography
Southern-hemisphere
Spacer sequences
Arundinoideae poaceae
Q-Index Code C1
Q-Index Status Provisional Code
Institutional Status Unknown

 
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Created: Mon, 13 Aug 2007, 14:43:19 EST