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- W2247653081 abstract "The grey dunes along the present-day depositional coasts of Latvia are among the most diverse dune ecosystems in the Baltic Sea region. This paper focuses on the grey dune plant communities, their classi fication based on the Braun-Blanquet approach and their ecology and distribution in Latvia. A total of 3,430 phytosociological releves were sampled in all coastal sections in the period from 1994 to 2008. The vegetation was classified using TWINSPAN analysis. Diagnostic species were determined for each syntaxon using statistical measures of fidelity (phi coefficient and Fisher’s exact test). The phytogeography of associations and variants is described on the basis of a distribution range analysis of plant species. In total, three associations of the class Koelerio-Corynephoretea occur in the grey dunes. The Corniculario aculeatae-Corynephoretum canescentis and the Caricetum arenariae belong to the alliance Corynephorion canescentis and the order Corynephoretalia canescentis. The Festucetum polesicae belongs to the alliance Koelerion glaucae in the order Sedo acris-Festucetalia. With six variants, it is the phytosociologically most diverse association of the grey dunes: typical variant, variant of Gypsophila paniculata, variant of Koeleria glauca, variant of Thymus serpyllum, variant of Epipactis atrorubens and variant of Corynephorus canescens. Our results show phytosociological differences among five coastal sections due to geomorpho logy and coastal processes. The most diverse grey dune plant communities occur on the open Baltic Sea coast where all three associations are represented. The most common vegetation type on all coastal sections in Latvia is the typical variant of the Festucetum polesicae. The Epipactis atrorubens variant of this association is widely distributed, too. It has its major occurrences along the Gulf of Rīga and the Irbe Strait. The Corniculario aculeatae-Corynephoretum canescentis was found in only two locations. Stands of the Festucetum polesicae var. Koeleria glauca occupy wider areas on old dunes, while the Festucetum polesicae var. Gypsophila paniculata is more typical on young dynamic dunes with intensive sand drift. The results of the phytogeographical analysis of vegetation data show that under the influence of climate, especially with dominance of the oceanic and transformed oceanic air masses, grey dune plant communities on the Latvian coast are mainly sub-oceanic to sub-continental. The most continental community is the Festucetum polesicae var. Koeleria glauca, while the Caricetum arenariae and the Corni culario aculeataeCorynephoretum canescentis have the strongest oceanic character. Zusammenfassung: Pflanzengesellschaften der Graudunen (Koelerio-Corynephoretea) an der Ostseekuste in Lettland Die naturraumliche Ausstattung Lettlands mit ihren Anlagerungen und Umlagerungen von Sand an den Kusten sowie verschiedenen Klimabedingungen und fruheren Landnutzungsformen ist ein Grund dafur, dass die Graudunen von Lettland zu den vielfaltigsten Dunenokosystemen der Ostseekuste zahlen. In diesem Artikel sind die Forschungsergebnisse uber die Pflanzengesellschaften der Graudunen Lettlands zusammengefasst. Im Zeitraum 1994−2008 wurden in typischen Graudunengebieten entlang der Kuste von Lettland 3.430 pflanzensoziologische Aufnahmen nach der Braun-Blanquet-Methode erstellt. Die Aufnahmen wurden mit TWINSPAN klassifiziert. Diagnostische Arten der herausgearbeiteten Einheiten wurden anschliesend mittels statistischer Treuemase (phi-Koeffizient, Fishers exakter Test) ermittelt. Die phytogeographische Analyse der Assoziationen und Varianten wurde auf Grundlage der Artenzusammensetzung der Vegetation vorgenommen. Insgesamt kommen drei Assoziationen aus der Klasse Koelerio-Corynephoretea in den Graudunen vor. Das Corniculario aculeatae-Corynephoretum canescentis und das Caricetum arenariae gehoren zum Verband Corynephorion canescentis in der Ordnung Corynephoretalia canescentis. Das Festucetum polesicae wird zum Verband Koelerion glaucae in der Ordnung Sedo acris-Festucetalia gestellt. Mit 6 Varianten (Typische Variante, Gypsophila paniculata-Var., Koeleria glauca-Var., Thymus serpyllum-Var., Epipactis atrorubens-Var. und Corynephorus canescens-Var.) ist es die vielfaltigste Assoziation der Graudunen. Der Vergleich von funf geomorphologisch und landschaftlich unterschiedlichen Kustenabschnitten zeigt, 409 Laime et al.qxp:Tuexenia 29 06.05.2009 11:13 Uhr Seite 409" @default.
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- W2247653081 date "2009-01-01" @default.
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- W2247653081 title "Grey dune plant communities (Koelerio-Corynephoretea) on the Baltic coast in Latvia." @default.
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