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Abstract Detail

Systematics Section / ASPT

Clark, John R. [1], Alfaro, Michael [2], Wagner, Warren L. [3], Roalson, Eric [1].

Exploring area-cladogram, event-based and model-based methods for lineage geohistory reconstruction: an island biogeography comparative study.

Biogeography, in simplest terms, is the study of the geographical distribution of life. Historical biogeography can be considered a sub-discipline of biogeography that is concerned with inferring the evolutionary histories from these current distributions. In recent years, several distinct approaches to dealing with factors affecting historical lineage diversifications (here after, lineage geohistory) have been developed. These can be classified as 1) area-cladogram, 2) event-based, and 3) model-based methods. These methods differ in what data is utilized – as simple as geographic area-taxon cladogram correlations or as complex as model-based methods that utilize extensive geologic, phylogenetic, and other pertinent data – in inferring lineage geohistory. In this study, we compared examples of these methods including 1) Fitch parsimony reconstruction [area-cladogram], 2) dispersal-vicariance analysis [event-based], 3) stochastic mapping [model-based], and 4) the likelihood method of Ree and collaborators [model-based]. Islands have long been recognized as model systems in which to study historical biogeography processes. Using the above methods, we analyzed the Pacific islands clade of the phylogenetically well-resolved genus Cyrtandra J.R. & G.Forster (Gesneriaceae). This large and diverse genus spans nearly a quarter of the Earth’s circumference representing a special case to test lineage geohistory inference methods. Current data strongly suggests that Cyrtandra has evolved under a classic dispersal-divergence, allopatric speciation model. Results from the respective analyses in this study were compared to this hypothesis and the relative influences of particular data were interpreted. Our results indicate that model-based methods perform better than area-cladogram and event-based methods by incorporating important data (in particular, geologic data) that cannot be accounted for in either of the latter methods. We also discuss future directions in model-based lineage geohistory reconstruction.

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1 - Washington State University, School of Biological Sciences, Po Box 644236, Pullman, Washington, 99164-4236, USA
2 - Washington State University, School of Biological Sciences, PO Box 644236, Pullman, WA, 99164-4236, United States
3 - Smithsonian Institution, Natural History - Botany, P.O. Box 37012, Washington, DC, 20013-7012

historical biogeography
ancestral range reconstruction
model-based methods.

Presentation Type: Poster:Posters for Sections
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P59049
Abstract ID:1972

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