Ohridohauffenia rotonda 

Scope: Global
Language: English

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Taxonomy [top]

Kingdom Phylum Class Order Family
Animalia Mollusca Gastropoda Littorinimorpha Hydrobiidae

Scientific Name: Ohridohauffenia rotonda (Radoman, 1964)
Pseudamnicola rotonda (Radoman, 1964)
Rotondia rotonda (Radoman, 1973)
Taxonomic Notes:

Radoman (1985) considered the species to be close to Ohridohauffenia depressa, which is lives sympatrically within part of the range.

Assessment Information [top]

Red List Category & Criteria: Endangered B1ab(iii)+2ab(iii) ver 3.1
Year Published: 2010
Date Assessed: 2009-11-24
Assessor(s): Albrecht, C., Hauffe, T. & Schreiber, K.
Reviewer(s): Er├Áss, Z., Seddon, M. & Cuttelod, A.
Contributor(s): Reischutz, P.

Ohridohauffenia rotonda is considered as Endangered B1ab(iii)+2ab(iii), as it is restricted to a single site, Lake Ohrid, with an area of less than 358 km2. The quality of habitat has been decreasing due to pollution and habitat degradation. It is a rare species usually found in low density and restricted to the littoral zone between 0 and 3 m depth, where current threats are affecting its habitat.

Geographic Range [top]

Range Description:

Ohridohauffenia rotonda is endemic to Lake Ohrid and thus only known in the Former Yugoslavian Republic of Macedonia (FYROM) and Albania. It is recorded on the south-eastern shore from Gorica Hill, near Ohrid town, to St. Naum (Radoman 1985) and from the north-west shore (Hauffe T. pers. comm. 2009).

Countries occurrence:
Albania; Macedonia, the former Yugoslav Republic of
Additional data:
Estimated area of occupancy (AOO) - km2:10-358
Continuing decline in extent of occurrence (EOO):NoExtreme fluctuations in extent of occurrence (EOO):No
Number of Locations:1
Lower depth limit (metres):3
Range Map:Click here to open the map viewer and explore range.

Population [top]

Population:This species is only found in a few locations and mainly in low abundance (C. Albrecht et al. pers. comm. 2009).
Current Population Trend:Unknown
Additional data:
Population severely fragmented:No

Habitat and Ecology [top]

Habitat and Ecology:This is a freshwater species only found in edges of the lake in the littoral zone on banks and on stones.
Continuing decline in area, extent and/or quality of habitat:Yes

Threats [top]

Major Threat(s):

Deforestation of the neighbouring area leads to erosion and an increased sediment load changes the lake bed, smothering the rocks with cover of fine sediment. The water quality is also changing due to pollution (eutrophication, sedimentation, agricultural run-off) leading to habitat degradation. As eutrophication continues, the biofilm (algae) present on the hard substrate is changing, diminishing habitat and food availability for this small gastropod. 

Conservation Actions [top]

Conservation Actions:

There is no current conservation action in place for this species. 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. Habitat monitoring (water quality and sediment load) would be useful to determine changes in the status of this species.

Citation: Albrecht, C., Hauffe, T. & Schreiber, K. 2010. Ohridohauffenia rotonda. The IUCN Red List of Threatened Species 2010: e.T155652A4815314. . Downloaded on 23 June 2018.
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