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Abstract Detail


Systematics Section

Oxelman, Bengt [1], Rautenberg, Anja [2], Prentice, Honor C. [3], Hathaway, Louise [4].

Phylogenetic relationships and optimal genealogical species delimitations of Silene section Melandrium (Caryophyllaceae).

Low-copy number nuclear regions from the RNA polymerase gene family (parts of the genes RPA2, RPB2 and RPD2) were used to infer the evolutionary relationships among the dioecious members of Silene section Melandrium (Caryophyllaceae), and their closest relatives, based on an extensive geographic and taxonomic sampling.
The dioecious species S. diclinis, S. dioica, S. heuffelii, S. latifolia, and S. marizii form a strongly supported monophyletic group. Silene heuffelii and S. diclinis are distinct from the other section Melandrium species, while our sample of S. dioica, S. latifolia and S. marizii contains sequences that apparently have a mixed origin.
We present a novel approach to compare alternative classifications of a set of closely related species. We use a Bayesian hierarchical method, as implemented in the software BEST to infer gene trees, and at the same time a species tree that is compatible with the gene trees given a coalescent process. By giving BEST different input files where the species are delimited in different ways, and comparing the Bayes Factors of the marginal likelihoods of the gene trees given the species tree, we conclude that the optimal genealogical species setup given our data is separate S. diclinis and S. heuffelii species, and a pooled “species” including S. dioica, S. latifolia and S. marizii.


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1 - University of Gothenburg, Deptartment of Plant and Environmental Scineces, Box 461, Gothenburg, SE-40530, Sweden
2 - Uppsala university, Systematic Biology, Evolutionary Biology Centre, Norbyvägen 18D, Uppsala, SE-75236, SWEDEN
3 - Lund University, Systematic Botany, Ecology Department, Solvegatan 37, Lund, SE-223 62, Sweden
4 - Lund University, Systematic Botany, Ecology Department, Sölvegatan 37, Lund, SE-22362, Sweden

Keywords:
species delimitation
species-trees
gene trees
Bayes factors.

Presentation Type: Oral Paper:Papers for BSA Sections
Session: 33
Location: Magpie A/Cliff Lodge - Level B
Date: Tuesday, July 28th, 2009
Time: 10:15 AM
Number: 33008
Abstract ID:361


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