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Abstract Detail

Species tree reconstruction in polyploid complexes

Schneeweiss, Gerald [1], Winkler, Manuela [2], Flatscher, Ruth [3], Sonnleitner, Michaela [2], Escobar Garcia, Pedro [2], Suda, Jan [4], Hülber, Karl [5], Schönswetter, Peter [3].

Phylogenetic relationships and evolutionary patterns in the Alpine polyploid complex Jacobaea carniolica (Senecio carniolicus; Astercaeae).

Jacobaea carniolica (syn. Senecio c.) is a common element of silicicolous alpine vegetation in the Eastern Alps and the Carpathians. Against previous assertions that it were exclusively hexaploid, in the Alps Jacobaea c. actually comprises three main cytotypes (diploids, tetraploids and hexaploids). The high incidence of cytotype co-occurrence (mainly diploids and hexaploids) within the same population and the low frequency of putative hybrids suggest that cytotypes follow independent evolutionary trajectories eventually resulting in speciation. Thus, Jacobaea c. is a good model system to study patterns and mechanisms of speciation in high-mountain plants. Using genetic, morphological and ecological data we (1) test for auto- vs. allopolploid origin of polyploid cytotypes; (2) assess genetic, morphological and ecological integrity of and differentiation among cytotypes, which forms the basis for an updated taxonomic treatment; and (3) test the roles of reproductive isolation mechanisms.

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1 - University of Vienna, Systematic And Evolutionary Botany, Rennweg 14, Wien, N/A, A-1030, Austria
2 - University of Vienna, Systematic and Evolutionary Botany, Rennweg 14, Vienna, A-1030, Austria
3 - University of Innsbruck, Institute of Botany, Sternwartestrasse 15, Innsbruck, A-6020, Austria
4 - Charles University In Prague, Faculty of Science, Dept. of Botany, Benátská 2, Prague, N/A, 128 01, Czech Republic
5 - University of Vienna, Conservation Biology, Vegetation Ecology and Landscape Ecology, Rennweg 14, Vienna, A-1030, Austria

reproductive isolation
ecological differentiation
cytotype mixture.

Presentation Type: Symposium or Colloquium Presentation
Session: SY09
Location: Grand Ballroom A/Riverside Hilton
Date: Wednesday, July 31st, 2013
Time: 8:00 AM
Number: SY09002
Abstract ID:160
Candidate for Awards:None

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