More specifically, we asked (1) if the decrease in macrophyte species richness between the 1950s and 2010/2011 was a general phenomenon in all studied river systems, (2) if nutrient-demanding and stress-tolerant species increased proportionally and (3) if community change has been more profound between the 1950s and the 1980s than between the 1980s and 2010/2011.Four regions located in the Pleistocene north-west German lowlands with a variety of small streams to medium-sized rivers were selected for study. Gesetz zur Neuregelung des Wasserrechts. Both the decrease in the regional species pool and in the plot-level diversity were dramatic with the consequence that most water courses are colonised nowadays by only species-poor, relatively uniform communities that contain a high proportion of species adapted to disturbance. Increasing the utility of indicator species analysis. BiolFlor – Eine Datenbank zu biologisch-ökologischen Merkmalen der Gefäßpflanzen in Deutschland. Eutrophication and endangered aquatic plants: an experimental study on Kuhar, U., T. Gregorc, M. Rencelj, N. Sraj-Krzic & A. Gaberscik, 2007. This is, for example, the case for Alahuhta, J., J. Heino & M. Luoto, 2011. Niedersächsisches Landesamt für Ökologie, Hildesheim.Riis, T. & K. Sand-Jensen, 2001. We thank Uta Müller (Göttingen) for help in the field work. Sydney's Klima wird als warm und gemäßigt klassifiziert. University Press, Cambridge.Lorenz, A. W., T. Korte, A. Sundermann, K. Januschke & P. Haase, 2012. Limnologica 37: 146–154.Landolt, E., B. Bäumler, A. Erhardt, O. Hegg, F. Klötzli, W. Lämmler, M. Nobis, K. Rudmann-Maurer, F. Schweingruber, J.-P. Theurillat, E. Urmi, M. Vust & T. Wohlgemuth, 2010. In Tüxen, R.

Es stehen Tageswerte und Monatswerte seit Beginn der Messungen zum Download in einer .zip-Datei bereit. ... Deutscher Wetterdienst Zentraler Vertrieb Klima und Umwelt Frankfurter Straße 135 Postfach 100465 63004 Offenbach. Species assemblages and indicator species: the need for a flexible asymmetrical approach. Veröffentlichungen der Arbeitsgemeinschaft für Biologisch-Ökologische Landeserforschung 27, Münster.Rasper, M., 2001. The aim of our study was to examine long-term changes in stream and river macrophyte vegetation from an over-regional perspective and, in case of changes, to elucidate the possible drivers of change. Wasserpflanzengesellschaften im östlichen Niedersachsen. Zur Geschichte der Ems – Natur und Ausbau. Weitere frei verfügbare Klimadaten finden Sie auch im Freier Zugang zu vielen Klimadaten des Climate Data Centers (Im Deutschen Klimaatlas präsentiert der Deutsche Wetterdienst mögliche Szenarien unseres zukünftigen Klimas in einer Zusammenschau mit unserem früheren und derzeitigen Klima. Pflanzensoziologie, Grundzüge der Vegetationskunde. & S. Schneider, 2003.

A., P. N. G. Boulton, E. M. Clegg, J. J. Gemmell, G. G. Graham, R. Gustar & T. P. Moorhouse, 1998. Large Rivers 162: 167–191.Schwieger, F., 2002. With the embankment of the Dümmer lake and its main tributary Hunte river in 1953, the Dümmer lowlands, where the majority of sites in the Ems-Hunte region is located, have been transformed from a landscape dominated by swamps and fens to an area, where arable land is predominant and high nutrient inputs are affecting the wetland vegetation (Blüml et al., Since the 1980s, some improvement in the nutrient status of the running waters of NW Germany has occurred. Fischer, Stuttgart.Daniel, H., I. Bernez & J. Haury, 2006. Fax: + 49 (0)69 8062 4499. Bildatlas der Farn-und Blütenpflanzen Deutschlands. Hydrobiologia 340: 67–76.Roll, H., 1939. Schriftenreihe für Vegetationskunde 38: 1–334.Kohler, A. Scripta Geobotanica 18: 1–258.Federal Water Act of Germany, 2009.

Phytocoenologia 4: 446–470.Marques, J. C., S. N. Nielsen, M. A. Pardal & S. E. Jørgensen, 2003. Hydrobiologia 570: 11–17.Demars, B. O. L. & M. Trémolières, 2009. A century of change in macrophyte abundance and composition in response to agricultural eutrophication. Journal of Applied Ecology 49: 202–212.Ludwig, G., R. May & C. Otto, 2007. Species richness, number of red-listed species and diversity (true diversity The pleustophytic growth form types as well as vallisnerids increased in relative abundance from the 1950s to 2010/2011. Basic and Applied Ecology 4: 493–506.Dierschke, H., 1994. You can also search for this author in In Landesamt für Natur und Umwelt Schleswig-Holstein.

Klima und … Schriftenreihe für Vegetationskunde 34:1–519.Korneck, D., M. Schnittler & I. Vollmer, 1996. However, apart from eutrophication effects, the loss in structural diversity of river beds is another complex of factors responsible for the macrophyte diversity decline in rivers and streams in Central Europe (Wiegleb et al., It is thus not surprising that stress-tolerant species make up the largest proportion of the macrophyte flora since the 1950s, which is interpreted as a sign that most water courses had lost their systems of dead channels and shallow side arms with its characteristic flora already decades ago. Schutzkonzept für gefährdete Wasserpflanzen der Fließgewässer und Gräben Schleswig-Holsteins, Teil B: Fließgewässer. Plant response strategies to stress and disturbance: the case of aquatic plants.