162346-1

Aldrovanda vesiculosa 

Scope: Europe
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Plantae Tracheophyta Magnoliopsida Nepenthales Droseraceae

Scientific Name: Aldrovanda vesiculosa L.
Regional Assessments:
Common Name(s):
English Waterwheel, Common Aldrovanda
Synonym(s):
Aldrovanda generalis E.H.L. Krause
Aldrovanda verticillata Roxb.
Drosera aldrovanda F. Muell. [Illegitimate]
Taxonomic Notes:

There are no significant taxonomic issues associated with this name.

Assessment Information [top]

Red List Category & Criteria: Data Deficient (Regional assessment) ver 3.1
Year Published: 2011
Date Assessed: 2011-03-12
Assessor(s): Bilz, M. & Lansdown, R.V.
Reviewer(s): Cuttelod, A.
Contributor(s): Eliáš, P., Ferakova, V., Hodálová, I., Király, G., Illarionova, I., Juffe Bignoli, D., Mereďa, P., Petrova, A., Rossi, G. & Stevanović, V.
Justification:
European regional assessment: Data Deficient (DD)
EU 27 regional assessment: Data Deficient (DD)
 
This species is clearly under threat as the widespread decline and local extinctions show. However, the generation length of this species is not known and it is not clear at which rate the decline took place and in which time frame. Therefore, it cannot be assessed under Criterion A. Furthermore, it can be suspected that the area of occupancy is below 2,000 km² as there are only a few localities left and that the remaining populations are severely fragmented - but for this kind of analysis point data maps would be needed. Therefore, this plant can only be assessed as Data Deficient at the moment with an urgent need for further research.

Geographic Range [top]

Range Description:

A. vesiculosa occurs from Europe east through the Caucasus, Kazakhstan and India to the Primorskye and Amur regions of Far Eastern Russia, China, Japan and the Korean Peninsula. It also occurs throughout much of Africa south of the Sahara as well as Madagascar and Australia. In Europe it occurs or formerly occurred from southern Scandinavia south to France east through the Balkans to the Ukraine. It is treated as introduced to Switzerland by the World Checklist of Selected Plant Species (The Board of Trustees of the Royal Botanic Gardens, Kew 2010).

Countries occurrence:
Native:
Belarus; Bulgaria; Croatia; Germany; Hungary; Liechtenstein; Lithuania; Macedonia, the former Yugoslav Republic of; Moldova; Poland; Romania; Russian Federation (Central European Russia, East European Russia, North European Russia, Northwest European Russia, South European Russia); Serbia (Serbia); Slovenia; Ukraine (Ukraine (main part))
Regionally extinct:
Austria; Czech Republic; France (France (mainland)); Greece (Greece (mainland)); Italy (Italy (mainland)); Slovakia
Introduced:
Switzerland
Additional data:
Upper elevation limit (metres):700
Range Map:162346-1

Population [top]

Population:Aldrovanda vesiculosa shows evidence of a widespread decline. It is considered extinct in Austria, France, Italy and Greece and was thought to be extinct in Bulgaria, Slovakia and Serbia until recent discoveries showed that small populations persist. There is one existing site in Bulgaria and a site which had been lost due to drainage but A. vesiculosa has been reintroduced (A. Petrova pers. comm. 2010). In Serbia, the species is classed as Critically Endangered. It is known from one single locality and has recently been rediscovered in northwest Serbia, in Šabac, Zasavica (Tomović et al. 2009).

It has been recorded from the regions of Bayern and Brandenburg in Germany but the population in Bayern is now extinct. The population trend is declining (Bundesamt für Naturschutz 2010). There is only one locality at present (Commission of the European Communities 2009).

In Lithuania, this plant occurs at four localities. In Poland, 65,000 to 1,200,000 individuals have been recorded (Commission of the European Union 2009)

It is considered Data Deficient in Croatia.

In Hungary, there is one consistent population which is apparently stable. In addition, two populations have recently been found; one of which is on the Romanian border and the other near the stable population. Five populations have been lost, mainly due to habitat loss although it is possible that it is overlooked (G. Kiraly).

In Russia, there are two main areas of distribution: the centre and south. There are not more than fifteen populations in European Russia and the Caucasus. It is considered extinct in the Rostov and Vorosh regions (I. Illarionova pers. comm. 2010).

In Slovakia, the species occurred in two localities in the past in the Východoslovenská nížina Lowlands (Nature Reserve Veľké jazero lake near Vojka and in the vicinity of the drainage ditch). It was found for the first time in 1960 in the terrain depression Veľké jazero lake, the maximum depth of which was at that time 2.5 m. The population was initially very large and flowering well. The locality was declared a nature reserve in 1967. Since 1979 the population has declined and in 1983 the species was observed there for the last time. It is now considered extinct in Slovakia. A. vesiculosa was introduced to three sites close to the original localities (two small lakes near Poľany village and an oxbow of the Latorica river near Veľké Kapušany), later also in two fishponds on locality Marheček in the Záhorie region and in a fishpond in Revúca cadaster area. The plants, however, have not survived (Oťaheľová pers. comm. 2009).

In the Ukraine, nearly 50 sites supporting the species were reported in the late 19th to early 20th centuries; now no more than 20 sites are known, mainly in the ponds of the Dnieper basin, in the mouths of the Danube, Dniester, Pivdennij and Bug Rivers and in the Szatski Lakes in Volhynian Region.
Current Population Trend:Decreasing
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:Aldrovanda vesiculosa is a perennial and carnivorous Hydrophyte and Geophyte that flowers from July to August.
It is found in permanent and temporary water bodies such as shallow lakes with silt bottom, hard oligo-mesotrophic waters with benthic vegetation of Chara spp., natural eutrophic lakes with Magnopotamion or Hydrocharition type vegetation, standing water in large sedge (Magnocaricion) stands as well as natural dystrophic lakes and pools. It grows in association with Lemnetea minoris and Utricularietea intermedio-minoris plant societies (Commission of the European Union 2009, Klotz et al. 2002). In Russia, it has also been reported from exposed shoals and reed-bulrush-reedmace stands.
Systems:Freshwater

Use and Trade [top]

Use and Trade: As with most carnivorous plants, there is some trade in A. vesiculosa, the potential or actual effect of this trade on wild populations is unknown.

Threats [top]

Major Threat(s): The main threats to the species can be summarised as acidification, canalisation, desilting, development, drainage, eutrophication, forestry clearance, gravel extraction, mining, and modification of the hydrology of wetlands (Commission of the European Union 2009).

Conservation Actions [top]

Conservation Actions:

This species is listed on Annex II of the Habitats Directive and under Appendix I of the Convention on the Conservation of European Wildlife and Natural Habitats (Bern Convention).

In Germany, the species is under national protection and classed with the highest threat category in the national Red List (Ludwig and Schnittler 1996). It is also red listed in the federal estates of Brandenburg and Bayern (Bundesamt für Naturschutz 2010). It is furthermore classed as Critically Endangered in Bulgaria (CR B2ac(ii); C2a(ii) and Hungary. In Lithuania, it is classed in the highest threat category (1). In Belarus and Switzerland, it is classed as Endangered. In Russia, it has been classed as Vulnerable. Control of water pollution is a much needed conservation measure. In the Ukraine it is classed as Rare in the Red Data Book
Reintroduction was attempted at a number of sites in Slovakia but this has so far been unsuccessful.

More information on population trend and size and rate of declines are needed.

Citation: Bilz, M. & Lansdown, R.V. 2011. Aldrovanda vesiculosa. The IUCN Red List of Threatened Species 2011: e.T162346A5577046. . Downloaded on 21 November 2017.
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