Radix relicta 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Hygrophila Lymnaeidae

Scientific Name: Radix relicta Polinski, 1929
Taxonomic Notes: The subpopulation found in the feeder springs system is considered to be genetically distinct from the rest of the population (Albrecht et al. 2008). If this subpopulation is described as a valid species, its Red List status will need to be reviewed.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2010
Date Assessed: 2009-11-25
Assessor(s): Albrecht, C., Hauffe, T. & Schreiber, K.
Reviewer(s): Seddon, M.B. & Cuttelod, A.

This widespread and abundant species is less sensitive to the threats impacting its habitat due to its life cycle and ecology. It is therefore considered as Least Concern (LC). However, if the feeder springs system sub-population is described as a valid species, it will qualify as Endangered (EN B1ab(iii)).


Geographic Range [top]

Range Description:

Endemic to Albania and the Former Yugoslavian Republic of Macedonia (FYROM), this species is restricted to Lake Ohrid, the St. Naum, Zagorican and Tusemista feeder springs of Lake Ohrid, the Drim System at least upstream to the dam Lake Globocicko (approximately 15 km north of Lake Ohrid), and to the Sum spring north-west of Lake Ohrid (Albrecht et al. 2008).

Countries occurrence:
Albania; Macedonia, the former Yugoslav Republic of
Additional data:
Number of Locations:6
Lower depth limit (metres):30
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This is an abundant species (C. Albrecht et al. pers. comm. 2009).
Current Population Trend:Stable
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:

In Lake Ohrid, Radix relicta was recorded between depths from 0 m to 35 m. It lives mainly on hard substrata (e.g. rocks, Dreissena bundles) or on algae of the Chara belt. (Albrecht et al. 2008)

Continuing decline in area, extent and/or quality of habitat:No

Threats [top]

Major Threat(s):

Pollution from sewage from major cities adjacent to the lake is contaminating the water of the lake. Agriculture near the Prespa lake is contaminating the Prespa Lake waters, which are feeding the aquifer of the Lake Ohrid, resulting in increased nutrient load (Matzinger et al. 2006). In relation to this eutrophication, the biofilm (algae) present on the hard substrate is changing, diminishing habitat and food availability. The quality of habitat in the Albanian springs is declining due to pollution by aquaculture, solid waste produced by domestic use and tourism/recreational activities, as well as over-abstraction of water. However this appears to be a quite hardy species and these are not considered currently to be a major threat.

Conservation Actions [top]

Conservation Actions:

The species is present in the Galicica National Park. However, Lake Ohrid is a World Heritage Site, the Albanian side is protected under national jurisdiction since 1999 and a Memorandum of Understanding has been signed between the two countries for the management for the lake.

Citation: Albrecht, C., Hauffe, T. & Schreiber, K. 2010. Radix relicta. The IUCN Red List of Threatened Species 2010: e.T155691A4825327. . Downloaded on 20 October 2017.
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