Overview

Distribution

Range Description

This species is widely distributed throughout Europe. It is found from northern France to western Switzerland, south and central Enland, eastern Wales, Germany to central Sweden, southern Finland and the western Ural region (Welter-Schultes 2010).
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Physical Description

Type Information

Type for Unio tumidus Retzuis, 1788
Catalog Number: USNM 31460
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Dry
Locality: England, United Kingdom
Microhabitat: Freshwater
  • Type:
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Type for Unio tumidus Retzuis, 1788
Catalog Number: USNM 272473
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Dry
Locality: River Thames, Teddington, England, United Kingdom
Microhabitat: Freshwater
  • Type:
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Type for Unio tumidus Retzuis, 1788
Catalog Number: USNM 40825
Collection: Smithsonian Institution, National Museum of Natural History, Department of Invertebrate Zoology
Preparation: Dry
Locality: England, United Kingdom
Microhabitat: Freshwater
  • Type:
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Ecology

Habitat

Habitat and Ecology

Habitat and Ecology
This species is found in freshwater rivers, generally concentrated in marginal zones where substrate is firm and muddy. It is also found in canals, drainage channels, river oxbows, fish ponds and flooded gravel pits and are less common on sand, fine gravel and soft mud substrates (Aldridge 1999). It is also found in some lakes, artificial lakes and old river arms, and is mostly restricted to lowlands. It seems to require cleaner and better oxygenated waters than other Unio species (Welter-Schultes, 2010).

Systems
  • Freshwater
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Depth range based on 1 specimen in 1 taxon.

Environmental ranges
  Depth range (m): 3.9 - 3.9
 
Note: this information has not been validated. Check this *note*. Your feedback is most welcome.

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Molecular Biology and Genetics

Molecular Biology

Statistics of barcoding coverage: Unio tumidus

Barcode of Life Data Systems (BOLDS) Stats
Public Records: 5
Specimens with Barcodes: 5
Species With Barcodes: 1
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Barcode data: Unio tumidus

The following is a representative barcode sequence, the centroid of all available sequences for this species.


There are 4 barcode sequences available from BOLD and GenBank.  Below is a sequence of the barcode region Cytochrome oxidase subunit 1 (COI or COX1) from a member of the species.  See the BOLD taxonomy browser for more complete information about this specimen and other sequences.

TTATGGTGAGGATTAGTGGGTTTGTCTTTA---AGGGTTATTATCCGAGTTGAATTGGGTCGGCCTGACGGAATTTTGTGTAAT---GAGCAGCTTTATTATTCTATTATTACGGCTCATGCTTTTGTAATAATTTTTTTTGCTGTGATACCGGCTATAATGGGAGGTATAGGAAATTGGCTTGTACCCATTATG---GTTGGATGTCCTGATATGGCATTTCCTCGTTTAAACAATGTAAGGTTTTGGTTATTGCTTGGTTCAGGGTTTTTGTTGGGGTGATCTATGTTTGTAGAGAGGGGTTGTGGTACTGGTTGAACTATTTACCCTCCTTTGTCTAATAAAACATTTCACTCTGGGGTTGCTGTTGATGTG---CTAATTTTTTCTTTACATTTGGCTGGGGTTTCTTCAATTCTTGGTTCATTAAATTTTATTACTACTATTGTAAATATGCGCGCAGATGTTATACAAGCTGAGTGTATACCTTTGTTTGTGTGATCTGTTTTGTGTACGGCTGGTTTGGTATTAATTTCTTTTCCTGTTTTAGCAGGT---GCTATTACTATATTGCTTACGGATCGTAATTTTAATACTTCTTTTTTTGATCCTTCAGGGGGAGGTGATCCGGTGCTCTTTATGCATTTGTTTTGATTTTTTGGTCACCCTGAAGTT
-- end --

Download FASTA File
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Conservation

Conservation Status

IUCN Red List Assessment


Red List Category
LC
Least Concern

Red List Criteria

Version
3.1

Year Assessed
2011

Assessor/s
Van Damme, D.

Reviewer/s
Böhm, M. & Collen, B.

Contributor/s

Justification
Unio tumidus, though rapidly declining in the western part of its range, is still common and widespread in eastern Europe. It is hence considered as Least Concern. However, population declines are occurring, so that further information is required on these declines and their causes in order to prevent the species from slipping towards Near Threatened or even a threatened category in the future.
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Population

Population
There are no population data available for this species.

Population Trend
Unknown
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Threats

Major Threats
The main threat to this species is habitat loss and disturbance through habitat modification for river and canal management, industrial development, dredging and pressures from invasive species (Weber 2005). Some populations have shown tolerance to water pollution while others have appeared sensitive to changes in water quality (Mouthon 1996). In Germany, this mussel was collected in large numbers from small running waters near the villages and boiled as food for pigs and chicken, the shells were crushed and dispersed on crops as fertilizers (Welter-Schultes 2010). Affected by increasing water pollution and habitat destruction, the species is rapidly declining in many countries. In Belgium, it was common but know has become virtulally extict in lower and central Belgium (D. Van Damme pers. comm. 2011)


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Management

Conservation Actions

Conservation Actions
There are no species-specific conservation strategies in place for this species. It is listed as Critically Endangered in Austria, Endangered in Germany and as Vulnerable in Switzerland (Welter-Schultes 2010). The predominant threat to this species is poor river management, so that management of marginal river zones would greatly reduce threats of habitat loss. Further information gathered on population trends would help elucidate the true status of the species in order to assess the species more accurately in future.
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Wikipedia

Swollen river mussel

The swollen river mussel, scientific name Unio tumidus, is a species of freshwater mussel, an aquatic bivalve mollusc in the family Unionidae, the river mussels.

Distribution

Its native distribution is European.

References

  1. ^ Van Damme, D. (2011). "Unio tumidus". IUCN Red List of Threatened Species. Version 2012.2. International Union for Conservation of Nature. Retrieved 22 April 2013. 
  2. ^ (Czech) Horsák M., Juřičková L., Beran L., Čejka T. & Dvořák L. (2010). "Komentovaný seznam měkkýšů zjištěných ve volné přírodě České a Slovenské republiky. [Annotated list of mollusc species recorded outdoors in the Czech and Slovak Republics]". Malacologica Bohemoslovaca, Suppl. 1: 1-37. PDF.
  3. ^ Juřičková L., Horsák M. & Beran L., 2001: Check-list of the molluscs (Mollusca) of the Czech Republic. Acta Soc. Zool. Bohem., 65: 25-40.
  4. ^ Red List of the molluscs (Mollusca) of the Czech Republic http://mollusca.sav.sk/malacology/redlist.htm
  5. ^ Glöer P. & Meier-Brook C. (2003) Süsswassermollusken. DJN, pp. 134, page 109, ISBN 3-923376-02-2
  6. ^ Swollen river mussel - Naturhistoriska riksmuseet
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