The situation of Egeria densa in Austria
Transient (casual) populations of Egeria densa (Hydrocharitaceae, EPPO List of Invasive Alien Plants) have been observed in 3 locations in Austria:
- In Vienna in Alte Donau, according to Forstner ; Hübl (1971);
- In Steiermark, in a small lake near Graz, according to Fritsch (1930);
- In Kärnten in ‘Warmbad Villach’, according to Melzer (1983).
These populations did not establish in Austria, and it is suspected that the presence of E. densa in these locations was due disposal of aquatic waste.
Sources
Essl F ; Rabitsch W (2002) Neobiota in Österreich. Umweltbundesamt, Wien, 432 pp. http://www.umweltbundesamt.at/fileadmin/site/publikationen/DP089.pdf
Fritsch K (1930) Neunter Beitrag zur Flora der Steiermark. Mitteilungen des;Naturwissenschaftlichen;Vereines für;Steiermark 67, 53–89.
Melzer H (1983) Floristisch Neues aus Kärnten. Carinthia II 93, 151–165.
Forstner W ; Hübl E (1971) Ruderal-, Segetal- und Adventivflora von Wien. Notring Verlag, Wien, 159 pp.
Personal communication with Swen Follak, AGES, email: swen.follak@ages.at and with Franz Essl, Umweltbundesamt Austria, email: franz.essl@umweltbundesamt.at