The swan mussel has a thin fragile shell. It is found in fresh stationary waters. It has a foot so that it maneuver a bit. There is one known incident of a swan. Descriptions and articles about the Swan Mussel, scientifically known as Anodonta cygnea in the Encyclopedia of Life. Includes Overview; Brief Summary; Distr. Anodonta-cygnea_jpg. Anodonta cygnea. Provided by Welter Schultes, Francisco Locality: Germany: Schleswig-Holstein, Brammer Teich near Kiel.
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The story may not end there, however, as the zebra mussel infestation is now waning and there is hope that the swan mussel can regain some of the territory lost to its competitor. Tolerates eutrophic conditions, but not in the last toxic stadium. As settlement increases, the filtration activity of the zebra mussels competes with that of the swan mussel which either suffers respiratory failure or starvation.
Lakes, old river arms, artificial lakes, needs silent waters, only rarely in running waters, usually in lowlands. Its native distribution is European-Siberian.
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It was formerly common in such places but has been displaced by main drainage schemes in rivers, excess siltation, eutrophication and, recently, anodonnta the invasive zebra mussel Dreissena polymorpha.
Threatened both in Ireland and Europe by diffuse pollution and the resultant periodic de-oxygenation of waters.
Swan mussel shells appear to be of anodohta thickness throughout, whereas duck mussel shells are clearly uneven and much thicker and opaque towards the lower front end of the shell. In other projects Wikimedia Commons. Unionidae The swan mussel is a very large bivalve mollusc which lives in streams, rivers and along lakeshores where the bottom is of rich mud or silt and relatively free of plant growth.
Species description A very large bivalve shell with a flattened profile and broad, oblong shape.
List of all species. Institute of Zoology, Slovak Academy of Sciences.
AnimalBase :: Anodonta cygnea species homepage
It can reach mm 6 in in size and has a nearly straight dorsal upper or hinge margin with a drawn out posterior end and slightly rounded to nearly straight ventral lower margin. Embryonal shell finely striated along the growth lines, the lines reach the margin. Putting a valve fygnea the shell up to strong light separates these two species. The zebra mussel impacts swan mussels indirectly, by settling on their shells which provide the only hard substrate in many waterways.
This mussel is associated with relatively unpolluted slow streams and lakes with mud or silt bottoms, habitats which are in universal decline. Malacologica Cygneaa in Czech.
Retrieved from ” https: A very large bivalve shell found in silty or muddy backwaters of streams, rivers and lakes. The Swedish Museum of Natural History. Wikimedia Commons has media related to Anodonta cygnea. Occasionally found in Spain and Portugal in artificially disturbed habitats, where infected fishes from central Europe were released.
Show history of this page. Retrieved 23 April Pictures of Anodonta cygnea. The swan mussel is a very large bivalve mollusc which lives in streams, rivers and along lakeshores where the bottom is of rich mud or silt and relatively free of plant growth.
Diffuse pollution has affected its habitat in most areas and dissolved oxygen is reduced in many to dangerously low levels cygneaa the summer months.