| Abstract Detail
Biogeography Grundmann, Michael [1], Ansell, Stephen [1], Schneider, Harald [2], Russell, Stephen J. [1], Vogel, Johannes C. [1]. Phylogeography of the sub-Mediterranean bryophyte Pleurochaete squarrosa. The dioecious moss Pleurochaete squarrosa is a widespread and common bryophyte in the Mediterranean Basin, whereas it is restricted to south-facing, open habitats in Central and Northwest Europe. This plant can reproduce sexually via spores or asexually via fragments. Populations were studied from across its European and North African range for a range of nuclear and plastidic markers. In the Mediterranean a significant decline in genetic variation within populations was observed along a west – east gradient. High values for coefficients of gene diversity (GST) provided evidence of geographic isolation and limited gene flow among populations 1) within islands, 2) within mainland areas, and 3) between islands and mainland, but no difference in gene diversity and GST between islands and mainland areas was observed. While sexually reproducing populations were found all over the Mediterranean Basin, high levels of multilocus linkage disequilibrium provide evidence of mainly vegetative reproduction elsewhere. Central European populations showed contrasting patterns of genetic diversity. In all but one area populations were entirely clonal, representing at least ten postglacial colonisations from the Mediterranean Basin northwards. Distribution patterns of allozyme multilocus genotypes and DNA haplotypes provide evidence for effective local dispersal (< 50 km) that followed the historic or recent long-distance dispersal from the south.
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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
refugia
population genetics
phylogeography
bryophytes
mosses
mediterranean.
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: P62003
Abstract ID:1589 |
