Raudnitschka, Dorit and Hensen, Isabell and Oberprieler, Christoph (2007) Introgressive Hybridization of Senecio hercynicus and S. ovatus (Compositae, Senecioneae) along an altitudinal gradient in Harz National Park (Saxony-Anhalt, Germany). Systematics and Biodiversity 5 (3), pp. 333-344.
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Introgressive hybridization of Senecio hercynicus and S. ovatus (Compositae, Senecioneae) was studied in a hybrid zone on the southern slopes of Mt Brocken (Harz Mountains, Germany). A total of 415 plants representing 10 stands along an altitudinal gradient were investigated using multivariate statistical analyses of morphological characters and molecular markers (random amplified polymorphic DNA[RAPD]). Both types of traits detected pure S. hercynicus stands on the summit plateau, pure S. ovatus stands at the lowest elevations, and hybrid swarms at intermediate elevations. While morphological and molecular patterns coincided, some individuals in hybrid stands combined morphological patterns typical of S. ovatus with RAPD patterns typical of S. hercynicus, and vice versa. In general, introgression was symmetrical within stands, though one stand combined S. ovatus characters with the glandular hair typical for S. hercynicus, and two stands combined a S. hercynicus typical RAPD genotype with morphological characters shifted towards S. ovatus. Because pure stands of S. hercynicus occurred only on the summit plateau of Mt Brocken, and markers typical for S. ovatus were detectable in stands up to 1040 m a.s.l., future fusion or assimilation of the rare form, S. hercynicus, by the more widespread S. ovatus appears possible at Mt Brocken.
|Institutions:||Biology, Preclinical Medicine > Institut für Botanik / Zellbiologie > Group Plant Systematics and Evolution (Prof. Dr. Christoph Oberprieler)|
|Keywords:||altitudinal gradient; Asteraceae; Harz Mountains; hybridization; hybrid zone; introgression; RAPDs; Senecio|
|Subjects:||500 Science > 570 Life sciences|
|Created at the University of Regensburg:||Unknown|
|Owner:||Prof. Dr. Christoph Oberprieler|
|Deposited On:||04 Feb 2011 10:26|
|Last Modified:||04 Feb 2011 13:42|