Within the project ‘Plant communities of Mecklenburg‐Vorpommern and their vulnerability’, a current synopsis of all vegetation types (excluding one‐layered cryptogam vegetation) from this federal state in NE Germany has been worked out and published in a two‐volume monograph (Berg et al. 2001, 2004a). An extensive data base of vegetation relevés and a consistent methodology provided the basis for the classification. On the one hand, this classification differs in various features from well‐known syntaxonomic concepts. On the other hand, the careful application of the Code of Phytosociological Nomenclature has led on several occasions to the conclusion that certain syntaxa lack valid names or that correct names can only be determined after a typification. Consequently all new descriptions, typifications and other nomenclatural decisions which are relevant to our project are being published in separate papers. Most are included in a two‐part publication of which this contribution represents the second one. In an introductory section, we describe some of the special features of our project, discuss the possible contribution of this regional study to the general system of plant communities, and point out the significance of the ICPN. We then briefly explain the nomenclatural evaluations and abbreviations used in the special section, as a supplement to the corresponding paragraphs in Part I (Dengler et al. 2003). The main substance of the paper deals with the nomenclatural revision of 18 vegetation classes belonging predominantly to the aquatic, semiaquatic or woody vegetation. The following classes are dealt with: Lemnetea, Ruppietea maritimae, Potamogetonetea, Littorelletea, Thero‐Salicornietea strictae, Montio‐Cardaminetea, Oxycocco‐Sphagnetea, Parvo‐Caricetea, Phragmito‐Magno‐Caricetea, Juncetea maritimi, Cakiletea maritimae, Salicetea purpureae, Vaccinio uliginosi‐Pinetea, Molinio‐Betuletea pubescentis, Alnetea glutinosae, Vaccinio‐Piceetea, Quercetea robori‐petraeae and Carpino‐Fagetea. Within these classes we describe 15 new syntaxa. One illegitimate name is replaced by a nomen novum, and in four cases we correct syntaxon names based on taxomomic errors. Finally, lecto‐ and neotypes of a further 134 syntaxa are designated. In the context of the syntaxa treated, we discuss some nomenclatural problems involved and give reasons for the scheduled proposals to the Nomenclature Commission for nomina ambigua, conservanda, inversa and mutata. The majority of the presented syntaxonomic modifications concern the vegetation of wetlands: In addition to the floristic differentiation of the syntaxa, special emphasis has been put on their clear ecological definition, particularly in terms of nutrient supply, hydrology and alkalinity of their habitats. In the classification of forest and shrub vegetation from hydromorphic sites, we have therefore placed emphasis on the ground vegetation instead of the few predominantly euryecious tree species. Compared to other classifications, the most important differences are as fo...
and 151 further syntaxa are typified. Nomenclatural questions are discussed if appropriate and the reasons given when applications concerning nomina ambigua, conservanda, inversa or mutata are proposed.The most important syntaxonomic novelties are the following: Subdivision of the Sisymbrietea into several orders, of which the Sisymbrietalia and the Conyzo canadensis-Brometalia tectorum ord. nov. occur in Central Europe -Subdivision of the Stellarietea mediae into the Aperetalia spicae-venti, the Dicranello staphylinae-Stellarietalia mediae ord. nov. and the Papaveretalia rhoeadis ord. nov. -Subdivision of the Koelerio-Corynephoretea into the two subclasses Koelerio-Corynephorenea subcl. nov. and Sedo-Scleranthenea subcl. nov. -Establishment of an alliance Filipendulo vulgarisHelictotrichion pratensis all. nov. which contains floristically impoverished semi-dry grasslands in the southern Baltic area -Subdivision of the MolinioArrhenatheretea into the two subclasses Arrhenatherenea subcl. nov. and Molinio-Juncenea subcl. nov. -Subdivision of the Trifolio-Geranietea into the two subclasses Melampyro-Holcenea subcl. nov. und Trifolio-Geranienea subcl. nov. (containing the Origanetalia vulgaris s. str. and the AnthericoGeranietalia sanguinei ord. nov.) -Subdivision of the Artemisietea vulgaris into the four subclasses Epilobienea angustifolii, Lamio albi-Urticenea dioicae subcl. nov., Agropyrenea intermedio-repentis subcl. nov. (containing the Rubo caesii-Calamagrostietalia epigeji ord. nov. and the Agropyretalia intermedio-repentis) and Artemisienea vulgaris.Ulicetea, Koelerio-Corynephoretea, Festuco-Brometea, Molinio-Arrhenatheretea, Trifolio-Geranietea, Artemisietea vulgaris). Insgesamt werden 17 Syntaxa gültig neu beschrieben (incl. Validierungen und Rangstufenänderungen), eine Namenskorrektur aufgrund eines sippentaxonomischen Irrtums vorgenommen und 151 weitere Syntaxa typisiert. Bei Bedarf werden nomenklatorische Probleme erörtert und geplante Anträge an das CNC auf Nomina ambigua, conservanda, inversa und mutata begrün-det.Als wichtigste syntaxonomische Neuerungen hervorzuheben sind: Gliederung der Sisymbrietea in mehrere Ordnungen, wovon die Sisymbrietalia und die Conyzo canadensis-Brometalia tectorum ord. nov. in Mitteleuropa vorkommen -Gliederung der Stellarietea mediae in die Aperetalia spicae-venti, die Dicranello staphylinae-Stellarietalia mediae ord. nov. und die Papaveretalia rhoeadis ord. nov. -Gliederung der Koelerio-Corynephoretea in die beiden Unterklassen Koelerio-Corynephorenea subcl. nov. und Sedo-Scleranthenea subcl. nov. -Aufstellung eines Verbandes Filipendulo vulgaris-Helictotrichion pratensis all. nov. für die floristisch verarmten Halbtrockenrasen der Klasse FestucoBrometea im südbaltischen Raum -Gliederung der Molinio-Arrhenatheretea in die beiden Unterklassen Arrhenatherenea subcl. nov. und Molinio-Juncenea subcl. nov. -Gliederung der Trifolio-Geranietea in die beiden Unterklassen Melampyro-Holcenea subcl. nov. und Trifolio-Geranienea subcl. nov. (mit den Origanetalia vulgaris s. str. u...
Shallow littoral macrophyte communities changed strongly in a mesotrophic lake Charophytes were replaced by angiosperms and vegetation-free areas Changes in water column nutrients and transparency do not explain macrophyte changes Groundwater-mobilized nutrients promote periphyton Periphyton can impair macrophytes by shading, higher sensitivity to waves and benthivorous fish 2
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