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Bithynia graeca 

Scope: Global, Europe & Mediterranean
Language: English
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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Littorinimorpha Bithyniidae

Scientific Name: Bithynia graeca Westerlund, 1879

Assessment Information [top]

Red List Category & Criteria: Vulnerable D2 ver 3.1
Year Published: 2011
Date Assessed: 2010-06-07
Assessor(s): Radea, K.
Reviewer(s): Glöer , P., Seddon, M.B., Cuttelod, A. & Nichols, C.
Justification:
According to some authors this species is endemic to Lake Pamvotis, Greece and has an extent of occurrence of 22 km2; this lake has been affected by man-made impacts such as sewage discharge and water level fluctuations, which are causing the habitat to degrade, therefore this species could be considered to be Critically Endangered if this restricted range is confirmed. However there are other records from two further sites that require investigation in light of the taxonomic revisions in this group, and as such the species is listed as Vulnerable D2, until the taxonomic reviews have been carried out.

This species is also assessed at regional level as:
EU 27 regional assessment: Vulnerable D2
European regional assessmen: Vulnerable D2
Mediterranean regional assessmen: Vulnerable D2

Geographic Range [top]

Range Description:According to Glöer and Maasen (2009), this species is endemic to Lake Pamvotis, Greece.  However older literature suggests a wider distribution, where B. graeca was also found in Tenaghi Philippon (Macedonia, Northern Greece) (Schütt 1987) and in artificial Lake Kerkini (Serres, Macedonia, Northern Greece) (Eleutheriadis and Lazaridou-Dimitriadou 2001). Lake Kerkini was formed by construction of a dam across Strymon river valley. The water of this lake is used for irrigation purposes. According to Frogley and Preece (2007), the identity of the above specimens need clarification in the light of the taxonomic revision made by Glöer and Pešič (2006).
Countries occurrence:
Native:
Greece (Greece (mainland))
Additional data:
Number of Locations:3
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This population status for this species is unknown, although it has been recently collected.
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This species inhabits freshwater lakes.
Systems:Freshwater
Continuing decline in area, extent and/or quality of habitat:Yes

Use and Trade [top]

Use and Trade: There is no trade information for this species.

Threats [top]

Major Threat(s): During the last decades Lake Pamvotis has been influenced by many man-made impacts, such as sewage discharge and water level fluctuation. Lake Pamvotis is an eutrophic ecosystem exhibiting also a serious decline of submerged vegetation.

Conservation Actions [top]

Conservation Actions: There are no conservation actions for this species. Proposed conservation actions: Restoration management strategy requires reduction of the external and internal organic load, control of non-point pollution sources, control of hydrological regime, and establishment of bio-manipulation techniques. Lake Pamvotis and Lake Kerkini are sites of Natura 2000 network (GR2130005-Limni Ioanninon and GR1260001-Limni -Kroussia-Koryfes Opus Beles, GR1260008, Texniti Limni Kerkini correspondingly).

Citation: Radea, K. 2011. Bithynia graeca. The IUCN Red List of Threatened Species 2011: e.T156023A4891608. . Downloaded on 18 September 2018.
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