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Pisidium supinum

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Taxonomy [top]

Kingdom Phylum Class Order Family
ANIMALIA MOLLUSCA BIVALVIA VENEROIDA SPHAERIIDAE

Scientific Name: Pisidium supinum
Species Authority: A. Schmidt, 1851
Taxonomic Notes: This species has been placed in the family Sphaeriidae, although some authors regard the Pisidium as worthy of listing as a distinct family, Pisiidae; traditionally, it is still placed as a subfamily of the Sphaeriidae.

Assessment Information [top]

Red List Category & Criteria: Least Concern ver 3.1
Year Published: 2011
Date Assessed: 2011-07-22
Assessor(s): Prie, V.
Reviewer(s): Böhm, M. & Collen, B.
Justification:
Pisidium supinum has been assessed as Least Concern. This species has a large geographic range, and has been recorded from France, Poland, Germany, Hungary, Switzerland, the UK and Canada. Although localized threats are likely to exist, these are unlikely to be causing a significant decline in the global population at present. While rare in the UK, this species was found to be abundant in the river Danube in Germany.

Geographic Range [top]

Range Description: This species is known from France, Poland, Germany, Hungary, Switzerland and the UK (Clarke 1981), as well as Central Asia (Kipp 2011). This species has also been reported from the eastern end of Lake Ontario in 1959, most likely introduced from Eurasia. There have been no further reports of this species within the Great Lakes – St. Lawrence system. In 1975, there were collections from Eastmain and La Grande rivers in northern Quebec (Clarke 1981).
Countries:
Native:
Belarus; France (France (mainland)); Germany; Hungary; Kazakhstan; Mongolia; Poland; Russian Federation; Switzerland; Ukraine; United Kingdom (Great Britain)
Introduced:
Canada (Ontario, Québec)
Range Map: Click here to open the map viewer and explore range.

Population [top]

Population: This species is considered to be rare in the UK (Quinn et al. 1996). It can occur in high densities, and 1,088 individuals per m2 were found during November 2007 in the River Danube. This species was generally found to be abundant in this river (Bódis 2007).
Population Trend: Unknown

Habitat and Ecology [top]

Habitat and Ecology: This species is known to inhabit lotic (rivers) environments, and has a reduced longitudinal extent which corresponds to strict ecological requirements (Mouthon 1999). The numbers of individuals was found to rise with increasing cadmium levels (Reckendorfer et al. 2006), and the species is found only in large rivers (Sommerhäuser et al. 2003). This species was found to be most abundant in the top 5 cm layer of sediment, and this is likely to be due to higher oxygen levels (Bódis 2007).
Systems: Freshwater

Threats [top]

Major Threat(s): This species is sensitive to biodegradable pollution (Mouthon 1999). Densities of this species fell during a heatwave in France in 2003, however, they then rose the following year (Mouthon and Daufresne 2006). The reproductive potential of this species is relatively low when compared with that of gastropods (Russel-Hunter 1978). This may make this species vulnerable to global temperature rise, but as yet there is no evidence to show that it will suffer long-term declines.

Conservation Actions [top]

Conservation Actions: There are no conservation actions known for this species across its range, although local actions maybe in place. Although the species is still widespread at present, it has been declining in parts of the range, so that further surveys are needed to determine the decline levels, and then determine whether further actions are necessary.

Citation: Prie, V. 2011. Pisidium supinum. The IUCN Red List of Threatened Species. Version 2014.3. <www.iucnredlist.org>. Downloaded on 22 November 2014.
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