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Abstract Detail


Biogeography

Ansell, Stephen [1], Grundmann, Michael [1], Schneider, Harald [2], Russell, Stephen J. [1], Vogel, Johannes C. [1].

Arabidopsis lyrata ssp. petraea: Non-model patterns of glacial history in a model plant Arabidopsis lyrata spp. petraea.

Arabidopsis lyrata, a close relative to A. thaliana, is an emerging model organism for evolutionary and ecological genetics of plants. Climate oscillations during Quaternary have caused dramatic geographic structuring of variation in this plant due to range fragmentation, genetic drift and recolonisation. With no fossil remains and no extant populations in putative southern European glacial refugia, the lack of a phylogeographic hypothesis is hindering the study of selection and adaptation in natural populations. Populations from its entire and disjunct European range were studied for nuclear and cpDNA diversity. All populations were highly genetically variable, but geographic location and genetic diversity did not correlate. Population differentiation between central and northern Europe areas was significant, but differentiation is only moderate within regions. Chloroplast DNA confirmed the existence of two gene pools and identified population admixture around the southern edges of northern distribution ranges. Thus, during the last glaciation the small perennial plant survived in two refugia between the Nordic and Alpine glaciers, one cryptic, one in central Europe. Postglacial recolonisation may have occurred in two waves with entire populations undergoing range expansion at the margin of receding glaciers, preserving genetic diversity and subsequently forming widespread admixture zones.


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1 - Natural History Museum, Department of Botany, Cromwell Road, London, SW7 5BD, England
2 - Natural History Museum, Cromwell Road, London, SW7 5BD, UK

Keywords:
glaciations
population genetics
phylogeography
refugia.

Presentation Type: Poster:Posters for Topics
Session: P
Location: Exhibit Hall (Northeast, Southwest & Southeast)/Hilton
Date: Sunday, July 8th, 2007
Time: 8:00 AM
Number: P62001
Abstract ID:1583


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