Georg Janauer (Author), Norbert Exler (Author), Goran Anačkov (Author), Veronika Barta (Author), Árpád Berczik (Author), Boža Pal (Author), Mária Dinka (Author), Valeri Georgiev (Author), Mateja Germ (Author), Matej Holcar (Author), Richard Hrivnák (Author), Ružica Igić (Author), Siniša Ozimec (Author), Anca Sârbu (Author), Brigitte Schmidt (Author), Udo Udo Schmidt-Mumm (Author), Wolfgang Schütz (Author), Milan Valachovič (Author), Dragana Vukov (Author), Igor Zelnik (Author), Alenka Gaberščik (Author)

Abstract

The Danube is the second-longest river in Europe that is subjected to various man-made alterations, including those related to hydro-power plants. We surveyed and analyzed the presence and abundance of macrophytes in the main channel from 2582 river kilometers (rkm) to 171 rkm. We also assessed selected habitat parameters in the sampled river stretches. Sixty-eight different plant species were recorded along the entire course. Among neophytes, we found Elodea nuttallii, E. canadensis, Vallisneria spiralis and Azolla filiculoides. Based on similarity analysis, we distinguished 15 plant communities, most of which were defined as associations, which were classified into 5 alliances and represented three vegetation classes, namely vegetation of rooted hydrophytes Potamogetonetea, the vegetation of pleustophytes Lemnetea and vegetation of marshes Phragmitetea. The number and abundance of plant species, as well as plant communities recorded in single stretches, varied along the course. Canonical correspondence analysis (CCA) revealed that environmental parameters explained 21% of plant species composition. CCA runs with neophytes explained 41% of the variance, and current velocity, water transparency, species number and bank structure were significant variables. The present study revealed that the free-running sections of the river are poor in number and abundance of plant species, whereas impounded reaches mainly show an opposite result.

Keywords

Donava;velike reke;makrofiti;neofiti;rastlinske združbe;razširjenost;

Data

Language: English
Year of publishing:
Typology: 1.01 - Original Scientific Article
Organization: UL BF - Biotechnical Faculty
UDC: 574
COBISS: 58377987 Link will open in a new window
ISSN: 2073-4441
Views: 149
Downloads: 53
Average score: 0 (0 votes)
Metadata: JSON JSON-RDF JSON-LD TURTLE N-TRIPLES XML RDFA MICRODATA DC-XML DC-RDF RDF

Other data

Secondary language: Slovenian
Secondary keywords: Donava;velike reke;makrofiti;neofiti;rastlinske združbe;razširjenost;
Type (COBISS): Article
Pages: str. 1-24
Volume: ǂiss. ǂ7
Issue: ǂ[article] ǂ918
Chronology: 27 Mar. 2021
DOI: 10.3390/w13070918
ID: 14554084