Valvata klemmi 

Scope: Europe
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Allogastropoda Valvatidae

Scientific Name: Valvata klemmi Schütt, 1962
Taxonomic Notes: According to Hauswald et al. (2008) this species shows no significant differences within the COI gene fragment to the Balkan widespread Valvata sp.1.

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii) (Regional assessment) ver 3.1
Year Published: 2011
Date Assessed: 2009-11-27
Assessor(s): Hauffe, T., Schreiber, K. & Albrecht, C.
Reviewer(s): Radea, K., Reischutz, P., Glöer , P., Seddon, M.B., Cuttelod, A. & Nichols, C.
Contributor(s): Radea, K.

This species is endemic to Greece. It has declined severely at its only known sites between 1962 (when it was thought to be common) up to 1982. Recent surveys in the last 25 years have only recorded shells, and the most recent surveys have only found dead shells at sites on the northeast and northwest edge of the lake Trichonis as well as Lake Ozeros, but not in Lake Lysimachia (Albrecht et al. 2009). The species is under threat from multiple changes in the waters of the lake, heavy pollution (with increasing nitrate content following water draining into the lake from streams carrying agricultural fertilizers used on the land and inflow of sewage) and over abstraction of water from the lake as the species occurs in a narrow belt in the lake. It is therefore considered as Endangered (EN B1ab(iii)).

The species is also assessed regionally as:

EU27 regional assessment:  Endangered (EN B1ab(iii)) at the level of the 27 member States of the European Union
European regional assessment: Endangered (EN B1ab(iii))
Mediterranean regional assessment: Endangered (EN B1ab(iii))

Geographic Range [top]

Range Description:This species is found in Greece, where it is recorded from Lake Trichonis, Lake Ozeros, and Lake Lysimachia (Albrecht et al. 2009). Currently V. klemmi is restricted to the north-east and –west shore of Lake Trichonis as well as west shore of Lake Ozeros (Albrecht et al. 2009).
Countries occurrence:
Greece (Greece (mainland))
Additional data:
Number of Locations:3
Lower depth limit (metres):27
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species has declined since 1962, when Schütt reported that the species was also found in Lake Lysimachia. Until 2007, this species could not be found again by several authors.
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This is a freshwater gastropod found in littoral and partly sublittoral parts of large lakes, where it is found on various substrates like stones, gravel, pebble, sand and mud.
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: This species is not utilized.

Threats [top]

Major Threat(s):

Habitat loss, due to water level drop, related to excessive water abstraction for agriculture, is threatening this species. Pollution related to intensive agriculture practice and settlements in the neighbouring area, is responsible for the eutrophication of the lake. In relation with this, the biofilm (algae) present on the substrate is changing, diminishing habitat and food availability for this gastropod. Herbicides might also impact diatomae communities, which are the major food source for this snail.

Conservation Actions [top]

Conservation Actions:

There are no conservation actions in place for this species although Lake Ozeros, Lake Trichonis and Lake Lysimachia are included in the network Natura 2000 (GR2310008-Limni Ozeros and GR2310009-Limnes Trichonida kai Lysimachia correspondingly).

Fertilizers, pesticides and herbicides use for agriculture purposes, as well as sewage from neighbouring villages need to be drastically reduced. 

Conservation actions should include monitoring of the habitats in the lake, as well as surveys to establish whether the species is still extant in both lakes. 

Citation: Hauffe, T., Schreiber, K. & Albrecht, C. 2011. Valvata klemmi. The IUCN Red List of Threatened Species 2011: e.T155855A4855874. . Downloaded on 28 May 2018.
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