Vegetation of the Czech Republic
Salvinio natantis-Spirodeletum polyrhizae SlavniŠ 1956
This association includes vegetation with the water fern Salvinia natans, which freely floats on the water surface. It is usually accompanied by lemnid species, and the proportion of cover of Salvinia versus lemnids broadly varies from place to place. In the Czech Republic, it occurs only in mesotrophic to eutrophic fishponds, although historically it has been also recorded in oxbows. It is thermophilous vegetation, which has never been common in the country. Natural occurrences are in the lowlands around Ostrava in north-western Moravia.
Orig. (SlavniŠ 1956): Salvinieto.Spirodelletum polyrrhizae ass. nova (Salvinia natans)
Syn.: Lemno-Salvinietum natantis Miyawaki et TŘxen 1960
Diagnostic species: Lemna minor, Nymphoides peltata, Riccia fluitans. Ricciocarpos natans, Salvinia natans, Spirodela polyrhiza
Constant species: Lemna minor, Salvinia natans, Spirodela polyrhiza
Dominant species: Lemna minor, Ricciocarpos natans, Salvinia natans, Spirodela polyrhiza
Formal definition: Salvinia natans cover > 5 % NOT Glyceria maxima cover > 25 % NOT Trapa natans cover > 25 % NOT Typha angustifolia cover > 25 % NOT Typha latifolia cover > 25 % Utricularia australis cover > 25 %
Source: ęumberovß K. (2011): VAA07 Salvinio natantis-Spirodeletum polyrhizae SlavniŠ 1956. In: Chytrř M. (ed.), Vegetace ╚eskÚ republiky. 3. VodnÝ a mok°adnÝ vegetace [Vegetation of the Czech Republic 3. Aquatic and wetland vegetation]. Academia, Praha, pp. 64-66.