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Notes on the distribution of Spergularia echinosperma and the newly recognized species S. kurkae in Austria / Pavel Kur in Neilreichia, vol. 9 (Année 2018)

Public [article]  inNeilreichia > vol. 9 (Année 2018) . - pp. 269-282 Titre : Notes on the distribution of Spergularia echinosperma and the newly recognized species S. kurkae in Austria Auteurs : Pavel Kur, Auteur ; Clemens Pachschwöll, Auteur ; Milan Stech, Auteur Année de publication : 2018 Article en page(s) : pp. 269-282 Langues : Anglais (eng) Catégories : [ZG] Autriche [Espèces (in biblio)] Caryophyllaceae [Espèces (in biblio)] Spergularia [Espèces (in biblio)] Spergularia echinosperma [Thèmes] Clé de détermination [Thèmes] Morphologie végétale [Thèmes] Phytogéographie Résumé : "Spergularia echinosperma represents a rare species of dwarf rush communities (vegetation class Isoëto-Nano-Juncetea) bound to exposed bottoms of fishponds, sediment accumulations along rivers, exposed banks of oxbows, lakes and water reservoirs. Despite considered an endemic of Central Europe, S. echinosperma has only been poorly studied biosystematically until recently. Latest studies, however, radically changed our view of the species’ evolution and taxonomy. Spergularia kurkae – an allotetraploid hybrid between diploid S. echinosperma and tetraploid S. rubra described in 1989 – has been demonstrated to be a stabilized self-seeding species. It grows in similar habitats as S. echinosperma but mostly occurs as a complete orphan, i.e., in the absence of any of the parental species. In addition, a new subspecies within S. echinosperma – S. echinosperma subsp. albensis – has been described recently. Mapping the distributions of these only recently distinguished taxa has so far been limited to the Czech Republic and parts of Germany, and information on their occurrence in other Central European countries is still lacking. The main goal of this study was to map the distributions of S. kurkae and both subspecies of S. echinosperma in Austria, using data from revised herbarium material. Spergularia kurkae was identified from collections from seven localities on exposed margins of fishponds and a river reservoir in the Waldviertel region (Lower Austria). Most of these occurrences are recent, having been discovered and collected after the year 2000. In contrast, S. echinosperma subsp. albensis was only found in two historical localities on the banks of the March River, both of them dating back to the first half of the 20th century. The other subspecies, S. echinosperma subsp. echinosperma, was not found among the herbarium material revised. As more intense floristic research in suitable habitats could lead to the discovery of more localities of these rare taxa, we present an updated determination key, which should aid field determination of the Austrian representatives of the genus Spergularia." (source : auteurs) Type de publication : périodique Référence biblio : Kur P., Pachschwöll C., Stech M., 2018 - Notes on the distribution of Spergularia echinosperma and the newly recognized species S. kurkae in Austria. Neilreichia, 9 : 269-282. ID PMB : 71875 Permalink : http://www.cbnbrest.fr/catalogue_en_ligne/index.php?lvl=notice_display&id=71875 [article]

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