caa a22 4500 445892072 CHVBK 20180317145619.0 cr unu---uuuuu 170323e20110801xx s 000 0 eng 10.1007/s10750-011-0705-5 doi (NATIONALLICENCE)springer-10.1007/s10750-011-0705-5 Characterisation of the potamal Danube River and the Delta: connectivity determines indicative macrophyte assemblages [Elektronische Daten] [Anca Sârbu, Georg Janauer, Udo Schmidt-Mumm, Peter Filzmoser, Daniela Smarandache, Gabriela Pascale] The complexity of water bodies in the eu-potamal river corridor and the main delta channels of the Romanian Danube is exemplified by the macrophyte vegetation. Two hypotheses provided the background for our study: (a) is the macrophyte vegetation of large, permanently connected branches significantly separated from that of the main river channel; (b) is the macrophyte composition of the Danube main stem significantly altered when the river divides into the three large navigable Delta channels. Water bodies considered were two contiguous sections of the main river channel, two large branches remaining from the historical floodplain, and the three main Delta channels. We quantified macrophyte diversity and floristic variation. Our data set was prepared from the MIDCC-project data base, in which macrophyte occurrence, abundance and habitat parameters are stored for contiguous survey units of the whole Danube river corridor. Field survey method followed that of Kohler and the European Standard EN14184. Results confirmed our first hypothesis: permanently connected side branches still support significantly different macrophyte assemblages, making them important indicators of floodplain connectivity. The diversion of the Danube into its three large navigable delta channels significantly alters the macrophyte vegetation from the c. 300km of main stem up-river, substantially supporting our second hypothesis. Our results largely enhance the knowledge on aquatic plant biodiversity in the eu-potamal Danube, forming a solid base for long-term studies. We also discuss the relevance of our results regarding the ecological, as well as the conservational, quality of rivers and their floodplains. Springer Science+Business Media B.V., 2011 Potamal Danube nationallicence River branches nationallicence Connectivity nationallicence Macrophytes nationallicence European Directives nationallicence Sârbu Anca Department of Botany, University of Bucharest, Aleea Portocalelor 1-3, Sector 5, 060101, Bucureşti, Romania aut Janauer Georg Department of Limnology und Hydrobotany, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria aut Schmidt-Mumm Udo Department of Limnology und Hydrobotany, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria aut Filzmoser Peter Institute of Statistics and Probability Theory, Vienna University of Technology, Wiedner Hauptstr. 8/107, 1040, Vienna, Austria aut Smarandache Daniela Department of Botany, University of Bucharest, Aleea Portocalelor 1-3, Sector 5, 060101, Bucureşti, Romania aut Pascale Gabriela Department of Botany, University of Bucharest, Aleea Portocalelor 1-3, Sector 5, 060101, Bucureşti, Romania aut Hydrobiologia Springer Netherlands 671/1(2011-08-01), 75-93 0018-8158 671:1<75 2011 671 10750 https://doi.org/10.1007/s10750-011-0705-5 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/s10750-011-0705-5 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- Sârbu Anca Department of Botany, University of Bucharest, Aleea Portocalelor 1-3, Sector 5, 060101, Bucureşti, Romania aut NATIONALLICENCE 700 1- Janauer Georg Department of Limnology und Hydrobotany, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria aut NATIONALLICENCE 700 1- Schmidt-Mumm Udo Department of Limnology und Hydrobotany, University of Vienna, Althanstrasse 14, 1090, Vienna, Austria aut NATIONALLICENCE 700 1- Filzmoser Peter Institute of Statistics and Probability Theory, Vienna University of Technology, Wiedner Hauptstr. 8/107, 1040, Vienna, Austria aut NATIONALLICENCE 700 1- Smarandache Daniela Department of Botany, University of Bucharest, Aleea Portocalelor 1-3, Sector 5, 060101, Bucureşti, Romania aut NATIONALLICENCE 700 1- Pascale Gabriela Department of Botany, University of Bucharest, Aleea Portocalelor 1-3, Sector 5, 060101, Bucureşti, Romania aut NATIONALLICENCE 773 0- Hydrobiologia Springer Netherlands 671/1(2011-08-01), 75-93 0018-8158 671:1<75 2011 671 10750 Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer