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Abstract Detail

Deep Time: Integrating Paleobotany and Phylogenetics

Manos, Paul S. [1], Soltis, Pamela S. [2], Soltis, Douglas E. [3], Manchester, Steven R. [4], Oh, Sang-Hun [1], Bell, Charles D. [5], Dilcher, David [6], Stone, Donald E. [1].

Phylogeny of Extant and Fossil Juglandaceae Inferred from the Integration of Molecular and Morphological Data Sets.

In this study we used the angiosperm clade Juglandaceae as a model for investigating methods of integrating fossils into a phylogenetic framework of extant taxa. After combining fossil organ genera into composite and terminal taxa our objectives were to: 1) compare multiple methods for the integration of the fossils and extant taxa (including total evidence, molecular scaffolds, and molecular matrix representation with parsimony: MRP); 2) explore the impact of missing data and the evidence for placing fossils on the topology; 3) simulate the phylogenetic effect of missing data by creating “artificial fossils”; and 4) place fossils and compare the impact of single and multiple fossil constraints in estimating the age of clades. Our results clearly show that the amount of missing data in any given taxon is not by itself an operational guideline for excluding fossils from analysis. Three fossil taxa (Cruciptera simsonii, Paleoplatycarya wingii, and Platycarya americana) were placed within crown clades containing living taxa for which relationships previously had been suggested based on morphology, whereas Polyptera manningii, a mosaic taxon with equivocal affinities, was placed firmly as sister to two modern crown clades. The position of Paleooreomunnea stoneana was ambiguous with total evidence, but conclusive with DNA scaffolds and MRP. There was less disturbance of relationships among extant taxa using a total evidence approach, and the DNA scaffold approach did not provide improved resolution or internal support for clades compared to total evidence, whereas weighted MRP retained comparable levels of support, but lost crown clade resolution. Multiple internal minimum age constraints generally provided reasonable age estimates, but the use of single constraints provided by extinct genera tended to underestimate clade ages.

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1 - Duke University, Department of Biology, 139 Biological Sciences Building, PO Box 90338, Durham, North Carolina, 27708, USA
2 - University of Florida, Florida Museum of Natatural History, Department Of Natatural Science, Gainesville, Florida, 32611-7800, USA
3 - University of Florida, Department of Botany, 220 Bartram Hall, P.O. Box 118526, Gainesville, Florida, 32611-8526, USA
4 - Florida Museum of Natural History, Dickinson Hall, P.O. Box 117800, Gainesville, Florida, 32611, USA
5 - University of Florida, Department of Botany, Florida Museum of Natural History, P.O. Box 117800, Gainesville, Florida, 32611-7800, USA
6 - Laboratory of Paleobotany and Palynology,, Florida Museum of Natural History, University of Florida, Gainesville, Florida 32611-7800, Gainesville, Florida, 32611, USA

molecular dating.

Presentation Type: Symposium or Colloquium Presentation
Session: SY08
Location: Stevens 4/Hilton
Date: Monday, July 9th, 2007
Time: 3:30 PM
Number: SY08005
Abstract ID:1059

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