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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Occasionally found in Spain and Portugal in artificially disturbed habitats, where infected fishes from central Europe were released. Species description A very large aodonta shell with a flattened profile and broad, oblong shape.
Threatened by continuous destruction of habitats, water current regulations, exaggerated pollution by fertilizers, also by natural drying out of waters. Archived from the original on 27 December The Swedish Museum of Natural History.
AnimalBase :: Anodonta cygnea species homepage
Its native distribution is European-Siberian. In other projects Wikimedia Commons. Lakes, old river arms, artificial lakes, needs silent waters, only rarely in running waters, usually in lowlands. As settlement increases, the filtration activity of the zebra mussels competes with that of anodont swan mussel which either suffers respiratory failure or starvation.
The zebra mussel impacts swan mussels indirectly, by settling on their shells which provide the only hard substrate in many waterways.
Diffuse pollution has affected its habitat in most areas and dissolved oxygen is reduced in many to dangerously low levels in the summer months. The geographical distribution of this species is from the British Isles east to Siberia, and south into northern Africa. Breeding depends upon the presence of reasonable water quality and of fish. This species is found in rivers and lakes.
Life cycle Adults are long lived and there is nearly always a good proportion of mature shells present in colonies. An annotated list of the land and freshwater Mollusca of Northern Ireland.
On a still, sunny day after a period of dry weather look down at the lake bottom with Polaroid glasses or using a glass-bottomed box. The shell color is often pale greenish or brownish. Tolerates eutrophic conditions, but not in the last toxic stadium. Prefers muddy substrate bare of vegetation.
How to see this species Swan mussels can sometimes be seen from fishing stands at the margins of lakes with silty or mud bottoms.
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Artificial lakes are usually reached when infected fishes are brought in, young mussels are rarely dispersed by water birds. Conservation of this species Current action Declaration as a Priority Species.
Home Introduction Selection Criteria:: Support environmental schemes aimed at reducing diffuse pollution whether anodnota agricultural sources, from inadequate sewage treatment in towns or from cygnnea malfunctioning or failure of septic tanks in rural areas.
List of all species. In this way large beds of swan mussel along the Shannon and Erne River systems have perished and enormous numbers of empty shells cast ashore. In brief A very large bivalve shell found in silty or muddy cyfnea of streams, rivers and lakes Threatened both in Ireland and Europe by diffuse pollution and the resultant periodic de-oxygenation of waters A more acute or short-term threat has been delivered by the invasive zebra mussel which competes for anodontw oxygen and food Red listed in Ireland as Vulnerable VU and as a Priority Species in Northern Ireland Species description A very large bivalve shell with a flattened profile and broad, oblong shape.
Swan mussel – Wikipedia
In Switzerland in up to m altitude. The story may not end there, however, as the zebra mussel anoeonta is now waning and there is hope that the swan mussel can regain some of the territory lost to its competitor. Institute of Zoology, Slovak Academy of Sciences. 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 cygnes plant growth.
Putting a valve of the shell up to strong light separates these two species.
The outlines of shells poking out of the mud can then be seen with the paired pale siphons appearing between the valves. Unionidae The cygmea mussel is a very large bivalve mollusc which xnodonta in streams, rivers and along lakeshores where the bottom is of rich mud or silt and relatively free of plant growth.
They will then drop off after a period of weeks and find a suitable place on the bottom to begin an independent life.
Because of its morphological variability and its wide range of distribution, there are over synonyms for this species. Pictures of Anodonta xnodonta. This mussel is associated with relatively unpolluted slow streams and lakes with mud or silt bottoms, habitats which are in universal decline. Nomenclator Zoologicus Neave updated, genera. Malacologica Bohemoslovaca in Czech. From Wikipedia, the free encyclopedia.