Vegetation of the Czech Republic
Elodeetum canadensis Nedelcu 1967
This species-poor vegetation type is dominated by Elodea canadensis, a neophyte of North American origin, which was introduced to the Czech Republic in the second half of 19th century. Its biomass is usually concentrated in deeper parts of the water column, and therefore this species requires good water transparency. It occurs in eutrophic water bodies such as fishponds, fish storage ponds, flooded sand pits, oxbows, channels and lentic sections of streams. The water in these habitats is usually 20–70 cm deep, but does not recede to expose the bottom. Elodeetum canadensis occurs across the lowland to submontane areas of the Czech Republic, but in recent decades it has been on the decline at some lowland sites due to an increase in water turbidity.
Orig. (Nedelcu 1967): Ass. Elodeetum canadensis (Pign. 1953) Soó 1964
Syn.: Helodeetum canadensis Eggler 1933 (§ 2b, nomen nudum), Aggrpm. ad Anacharis canadensis e Potamogeton crispus Pignatti 1953 (§ 3c), Elodeetum canadensis Pignatti 1953 (fantom), Elodeetum canadensis Soó 1964 (§ 2b, nomen nudum)
Diagnostic species: Elodea canadensis
Constant species: Elodea canadensis, Lemna minor
Dominant species: Elodea canadensis
Formal definition: Elodea canadensis cover > 50 % NOT Equisetum fluviatile cover > 25 % NOT Nymphoides peltata cover > 25 % NOT Potamogeton natans cover > 25 % NOT Schoenoplectus lacustris cover > 25 % NOT Sparganium erectum cover > 25 %
Source: Šumberová K. (2011): VBB06 Elodeetum canadensis Nedelcu 1967. In: Chytrý M. (ed.), Vegetace České republiky. 3. Vodní a mokřadní vegetace [Vegetation of the Czech Republic 3. Aquatic and wetland vegetation]. Academia, Praha, pp. 155-159.