TRIBSCH, ANDREAS1*, PHILIPPE CHOLER2, PETER SCHOENSWETTER3, and TOD F. STUESSY1. 1Institute of Botany, Department of Systematics and Evolution of Higher Plants, University of Vienna, Rennweg 14, A-1030 Vienna, Austria; 2Laboratoire de Biologie des Populations d'Altitude UMR UJF-CNRS 5553 & Station Alpine du Lautaret (Jardin Botanique Alpin et Chalet-Laboratoire), Universite J. Fourier - Grenoble I, Batiment D de Biologie - BP 53 X - 38041 GRENOBLE cedex 09, France; 3Institute of Botany, Department of Chorology and Vegetation Science, University of Vienna, Rennweg 14, A-1030 Vienna, Austria. - Alpine grasslands and the ice age - comparative phylogeography of the dominant sedge Carex curvula subsp. curvula (Cyperaceae) and some frequently associated taxa.
The sedge Carex curvula subsp. curvula (Cyperaceae) is
the dominating graminoid in the alpine zone on siliceous substrates in
the European Alps. It also occurs in other European mountain ranges,
e.g. in the S. Carpathians and the Pyrenees. By applying the
AFLP-fingerprinting technique on samples from more than 100
populations from the entire distributional range, we try to localize
the Pleistocene refugia of this taxon. C. curvula, being
wind-pollinated, is characterized by a low level of genetic
differentiation between populations caused by high levels of gene flow
via pollen. Whilst long-term separation of populations in the
Carpathians is supported, the populations of the Pyrenees are closely
related to populations of the Western Alps and are possibly of recent
origin. Phylogeographic patterns of other alpine plant species, i.e.
Phyteuma hemisphaericum (Campanulaceae), Saponaria
pumila (Caryophyllaceae), Senecio incanus (Asteraceae) and
Veronica bellidioides (Scrophulariaceae) growing more or less
exclusively in C. curvula communities, are presented.
Congruences and contrasts in the phylogeographic patterns are
discussed. Using a set of statistical approaches, the localization of
several glacial refugia for these plant species seems possible. The
populational groups identified by phylogeographical analyses are
largely congruent with general biogeographical patterns, showing
centers of endemism of alpine plants in the European Alps.
Key words: AFLP, alpine plants, Carex curvula, comparative phylogeography, European Alps, Pleistocene refugia