Vegetation Science Group

Department of Botany and Zoology | Faculty of Science | Masaryk University

Vegetation of the Czech Republic

Association VBB17
Najadetum minoris Ubrizsy 1961

Najadetum minoris

Photo on botanickafotogalerie.cz

This vegetation type is dominated by Najas minor, a submerged macrophyte species, which may grow across the entire water column. It is found in mesotrophic to eutrophic, calcium-rich water, often with elevated concentration of chlorides, especially in fishponds, fish storage ponds, alluvial pools, and flooded pits in river floodplains. These water bodies are usually 20–50 cm deep and frequently contain a layer of organic mud on the bottom. In the Czech Republic this is a rare, ephemeral association, so far recorded in the České Budějovice Basin, southernmost Moravia, and the Ostrava region.

Nomen conservandum propositum (against Najadeto-Potametum acutifolii Slavnić 1956)

Orig. (Ubrizsy 1961): Najadetum minoris Ubrizsy 1948

Syn.: Najadetum minoris Ubrizsy 1948 (fantom), Najas minor-Chara coronata facies Ubrizsy 1948 (§ 3c), Najadeto-Potametum acutifolii Slavnić 1956 (potential correct name), Potamo-Najadetum Horvatić et Micevski in Horvatić 1963 p. p., Najadetum marinae najadetosum minoris O»aheµová 1980

Diagnostic species: Butomus umbellatus, Ceratophyllum demersum, Lemna minor. Myriophyllum spicatum, Najas minor, Potamogeton crispus. P. pectinatus, P. pusillus agg. (P. pusillus s. str.), Spirodela polyrhiza

Constant species: Ceratophyllum demersum, Lemna minor, Najas minor, Potamogeton pusillus agg. (P. pusillus s. str.), Spirodela polyrhiza

Dominant species: Ceratophyllum demersum, Najas minor

Formal definition: Najas minor cover > 25 %

Source: ©umberová K. (2011): VBB17 Najadetum minoris Ubrizsy 1961. 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. 190-192.