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Abstract Detail


Biogeography

Wanke, Stefan [1], Mahfoud, Hafez [1], Neinhuis, Christoph [1].

Origin and Evolution of the genus Aristolochia in the Mediterranean The only diversity hotspot of the genus in the northern hemisphere.

Sampling all Mediterranean and Near East species this study aims to infer the evolution of Aristolochia in the only diversity hotspot of the genus in the northern hemisphere based on a complete phylogeny of several coding and non-coding cpDNA regions. In addition dense population sampling in several clades has been performed to infer speciation and colonisation processes in this group, which is characterised by a high amount of endemics. Results from chloroplast DNA had been compared with nuclear single copy gene phylogenies on population level to detect potential natural hybridisation. By representative sampling of additional Old World taxa (Asia & Africa), this study provides evidence for multiple colonisations of the Old World in each of the two subsections Podanthemum and Aristolochia. Within the Mediterranean, Near East and Caucasian species of subsection Aristolochia two morphologically and biogeographically well supported groups can be identified: the Near East/Caucasian species and the West Mediterranean species (with few exceptions). Our results only partly confirm the former groupings, which were based on morphological characters. One clade will be addressed on the species level and below, to exemplary elucidate the radiation of the genus Aristolochia in the Mediterranean: sampling over 70 populations of the pan-Mediterranean species A. sempervirens and A. baetica, indicate natural colonization of the current distribution areas as well as anthropogenic introduction.


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1 - Technische Universitaet Dresden, Intitut fuer Botanik, Dresden, 01062, Germany

Keywords:
species-level phylogenetics
Old World
nuclear single copy gene
Speciation
colonisation.

Presentation Type: Oral Paper:Papers for Topics
Session: 54
Location: 201/Law
Date: Wednesday, July 30th, 2008
Time: 9:45 AM
Number: 54008
Abstract ID:312


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