Lemna minuta Humb., Bonpl. et Kunth

English Least duckweed ISEIA: B1 – Watch List
Lëtzebuergesch Klinzeg Intelëns EASIN
Français Lentille d’eau minuscule Wikipedia: Wikipedia - English - Least duckweed Wikipedia - Nederlands - Dwergkroos
Deutsch Winzige Wasserlinse Wikispecies: Wikispecies - Lemna minuta
Nederlands Dwergkroos Back to the list of neophytes

Report the species

Report Lemna minuta to the National Museum of Natural History.

Importance and distribution in Luxembourg

Distribution map of Lemna minuta Humb., Bonpl. et Kunth in Luxembourg. Recorder-LUX & iNaturalist, 2019.08.21.

Lemna minuta is new to the Grand Duchy. It was observed in Mecheren near Remerschen (Municipality of Schengen) close to the bird watch station on 21 June 2015 by Guy Colling and on 29 June 2015 by A. Mesterházy (Krippel & Colling 2016).

This aquatic monocotyledon, the smallest species of its kind, was discovered in 1983 in the territory of the “Nouvelle Flore” (Lambinon & Verloove 2012). Given its pervasive potential, it was listed on the alert list (Ries et al. 2013). It should be noted that the tiny water lens had already been reported for the Remerschen ponds in 2002 by Gérard Schmidt (in litt.), But no herbarium specimens had been taken at that time (Krippel & Colling 2016).

Lemna minuta is an aquatic plant that settles in shallow standing or slow flowing waters, often in shaded conditions. Outbreaks of the species cause dense floating mats at the water surface that reduce light penetration and gas exchanges, causing the predominance of respiratory activities and the reduction in dissolved oxygen in water beneath the mats. As for native duckweed species, outbreaks are usually limited in time and space and are favoured by increased levels of water eutrophication that often cause the disappearance of submerged macrophytes. Waterfowl and Cyprinid fish are known to eat duckweeds to supplement their diet which may help to reduce outbreaks (Source: http://ias.biodiversity.be/species/show/69).

Risk assessment

ISEIA Protocol: B1 (2+3+2+3) = Watch List. Reassessed 16 February 2017 by Yves Krippel and Christian Ries. Assessment before the appearance of the species in Luxembourg: B0 (2+3+2+3) = Alert List (Ries et al. 2013).

Bibliography concerning Luxembourg

  • Krippel, Y. & G. Colling, 2016. Notes floristiques. Observations faites au Luxembourg (2014-2015). Bull. Soc. Nat. luxemb. 118: 27-51. [PDF 1,33 MB]
  • Lambinon, J. & F. Verloove (collab. L. Delvosalle, B. Toussaint, D. Geerinck, I. Hoste, F. van
    Rossum, B. Cornier, R. Schumacker, A. Vanderpoorten & H. Vannerom), 2012. Nouvelle Flore de la Belgique, du Grand-Duché de Luxembourg, du Nord de la France et des Régions voisines. (Ptéridophytes et Spermatophytes), 6e éd. Jardin botanique national de Belgique, Meise, CXXXIX + 1195 pp.
  • Ries, C., Y. Krippel, M. Pfeiffenschneider & S. Schneider, 2013. Environmental impact assessment and black, watch and alert list classification after the ISEIA Protocol of non-native vascular plant species in Luxembourg. Bull. Soc. Nat. luxemb. 114: 15-21. [PDF 652 KB]

Suggested citation of this webpage

Ries, C. & M. Pfeiffenschneider (Eds.), 2019. Lemna minuta Humb., Bonpl. et Kunth. In: neobiota.lu - Invasive Alien Species in Luxembourg. URL: https://neobiota.lu/lemna-minuta/ [21.08.2019].

 Last updated on Friday, April 20, 2018.