Systematics Section / ASPT
Tkach, Natalia , von Hagen, K. Bernhard , Hoffmann, Matthias .
The geographical origins of the many arctic Artemisia L. (Asteraceae) species.
THE genus Artemisia is rather species rich and occurs mainly in the northern hemisphere. It is one of the most diverse taxa of the arctic with c. 39 arctic or widespread/arctic species. We were interested from which geographical and ecological source areas Artemisia colonized this extreme habitat and how many times this happened. Therefore, we sampled 133 taxa (partly published by other authors) including all but two of the arctic species and many northern Asian species. We sequenced the nuclear 3´ ETS and ITS regions and the resulting phylogeny was partly poorly supported. It was also in contrast with the traditional classification based on capitula characters (as already shown by others). We could clearly show, however, that arctic habitats were colonized repeatedly and independently from many different source areas. It seems that especially temperate progenitors were preadapted to the harsh arctic environment and that the many arctic species were not produced by major radiations.
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1 - Martin-Luther-University Halle-Wittenberg, Institute for Geobotany, Neuwerk 21, Halle, 06114, Germany
Presentation Type: Poster:Posters for Sections
Location: Auditorium/Bell Memorial Union
Date: Tuesday, August 1st, 2006
Time: 12:30 PM