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Abstract Detail


Deep Time Colloquium

Mast, Austin [1], Weston, Peter H. [2], Jones, Eric [1], Sauquet, Hervé [3], Cantrill, David [4], Jordan, Gregory [5], Barker, Nigel [6].

The timing of disjunctions in the southern hemisphere family Proteaceae: Sensitivity analysis with 6 genes, multiple calibration points, and 70+ genera.

PROTEACEAE (>1700 species in 80 genera) is a widespread family in the Southern Hemisphere with a fossil history dating back to before the rifting of the Gondwanan supercontinent. It has long been recognized that multiple lineages of the family are represented within the flora of each Gondwanan fragment, suggesting multiple parallel disjunctions in the history of the family. We use 3 chloroplast genes (matK, atpB, and ndhF) and 3 nuclear genes (PHYA and 2 loci of waxy) to infer the phylogeny of 70+ genera from the family, identify replicate geographic disjunctions in the phylogeny (e.g., up to 8 between S America and Australasia), and determine whether the last terrestrial connections between the fragments involved fall within the 95% credible intervals for the age of the divergences. The availability of multiple calibration points in the family’s rich fossil record allows us to examine the sensitivity of our conclusions to the calibration points used and determine which calibration points are most incongruent with others in the context of the analysis. The picture that emerges suggests a mix of disjunctions dating back to Gondwanan breaks and those that are far more recent. We will relate these more recent disjunctions to the evolution of propagule traits in the family.


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1 - Florida State University, Department of Biological Sciences, Tallahasse, Florida, 32306-1100, USA
2 - Royal Botanic Gardens, Mrs Macquaries Road, Sydney, New South Wales, 2000, Australia
3 - Swedish Museum of Natural History, Department of Palaeobotany, Svante Arrhenius väg 7, P.O. Box 50007, Stockholm, SE-104 05, Sweden
4 - Swedish Museum of Natural History, Po Box 50007, Stockholm, SE-104 05, Sweden
5 - University of Tasmania, Department of Plant Sciences, Private Bag 55, Hobart, Tasmania, 7001, Australia
6 - Rhodes University, Department of Botany, Molecular Ecology & Systematics Group, Grahamstown, Eastern Cape, 6140, South Africa

Keywords:
Proteaceae
Gondwana
biogeography
phylogeny
molecular dating
fossils
fruit evolution.

Presentation Type: Symposium or Colloquium Presentation
Session: 44-1
Location: 206/Performing Arts Center
Date: Tuesday, August 1st, 2006
Time: 10:15 AM
Abstract ID:327


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