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Comparative analyses of the vascular flora of Kopački rit and the Danube Delta

Two most recognisable wetland areas in the Danube River catchment are: Kopački rit in the middle part of the Danube River, and Danube Delta in the area of the mouth into the Black Sea. Due to biological and ecological values, these areas are protected at national level as Nature Park Kopački rit in Croatia, and Danube Delta Biosphere Reserve in Romania. Both areas are designated as Wetlands of International Importance (Ramsar sites), and part of the UNESCO World Network of Biosphere Reserves. They are also included within Natura 2000 sites under the EU Birds and Habitats Directives. Vascular flora of Kopački rit and Danube Delta has been analysed, based on available data. Flora diversity of Kopački rit comprise 554 species (11.08% of Croatian flora), 306 genera and 97 families, and of Danube Delta 1, 031 species (27.2% of Romanian flora), 435 genera and 113 families. Among the families, Asteraceae and Poaceae are the most numerous, as well as genus Carex, in both areas. Life- form analyses indicated domination of hemicryptophytes (39%) and phanerophytes (11%) in Kopački rit, and of therophytes (38%) and hemicryptophytes (33%) in Danube Delta. Plants from the East European-Pontic floristic elements were dominant in Danube Delta (25%), then in Kopački rit (2%). There are 56 alien species, of which 26 invasive alien species in flora of Kopački rit, and 163 alien species, of which 36 invasive alien species in flora of Danube Delta. Alien species are more frequent (15.8%) in Danube Delta then in Kopački rit (10.1%).

biodiversity ; flora ; Kopački Rit ; Danube Delta ; IAS

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