Vegetation Science Group

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

Vegetation of the Czech Republic

Association VAA05
Lemnetum gibbae Miyawaki et J. Tüxen 1960

Lemnetum gibbae

Photo on botanickafotogalerie.cz

This association includes open to closed stands of Lemna gibba, a tiny species freely floating on the water surface. Its stands are slightly shiny and lighter green than those of other lemnids. It occurs in eutrophic to hypertrophic water bodies, often with high concentrations of nitrogen, phosphorus, calcium, and even chlorides. In the Czech Republic it is most common in warm lowlands, but it tends to spread with increasing eutrophication, even to higher altitudes.

Orig. (Miyawaki & J. Tüxen 1960): Lemnetum gibbae (W. Koch 1954) ass. nova

Syn.: Wolffio-Lemnetum gibbae Bennema 1943 ms. p. p. (§ 1), Lemno-Spirodeletum polyrhizae Koch 1954 lemnetosum gibbae Koch 1954 (§ 2b, nomen nudum)

Diagnostic species: Lemna gibba, Spirodela polyrhiza

Constant species: Lemna gibba, L. minor. Spirodela polyrhiza

Dominant species: Lemna gibba, L. minor

Formal definition: Lemna gibba cover > 50 % NOT Acorus calamus cover > 25 % NOT Berula erecta cover > 25 % NOT Butomus umbellatus cover > 25 % NOT Carex riparia cover > 25 % NOT Ceratophyllum demersum cover > 25 % NOT Eleocharis palustris agg. cover > 25 % NOT Elodea canadensis cover > 25 % NOT Equisetum fluviatile NOT cover > 25 % NOT Glyceria maxima cover > 25 % NOT Lemna trisulca cover > 50 % NOT Oenanthe.aquatica cover > 25 % NOT Phragmites australis cover > 25 % NOT Potamogeton natans cover > 25 % NOT Potamogeton nodosus cover > 25 % NOT Potamogeton pectinatus cover > 25 % NOT Rumex maritimus cover > 25 % NOT Schoenoplectus lacustris cover > 25 % NOT Sparganium erectum cover > 25 % NOT Typha latifolia cover > 25 % NOT Zannichellia palustris cover > 25 %

Source: Šumberová K. (2011): VAA05 Lemnetum gibbae Miyawaki et J. Tüxen 1960. 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. 57-61.