ANODONTA CYGNEA PDF

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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Embryonal shell finely striated along the growth lines, the lines reach the margin.

IUCN Red List of Threatened Species

List of failure reports. Threatened by continuous destruction of habitats, water current regulations, exaggerated pollution by fertilizers, also by natural drying out of waters. Click on map to open large map in new window.

This page was last edited on 4 Aondontaat They have a strong pungent odor and are used by carp fisherman as bait. The geographical distribution of this species is from the British Isles east to Siberia, and south into northern Africa.

Archived from the original on 14 February The swan mussel is a very large bivalve cyggnea which lives in streams, rivers and along lakeshores where the bottom is of rich mud or silt and relatively free of plant growth. Putting a valve of the shell up to strong light separates these two species. Glochidia are mature in autumn, are released in spring in England and in Italytheir size 0. Similar species The only other large mussel found in still or nearly still waters is the duck mussel Anodonta anatine.

Retrieved 23 April Shell yellowish or greenish brown, thin, not very solid, ligament long and narrow, without teeth, lower side of frontal interior margin not thickened. From Wikipedia, the free encyclopedia. Wnodonta depends upon the presence of reasonable water quality and of fish. 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.

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Host fishes for glochidia are Salmo trutta, Perca fluviatilis, Leuciscus leuciscus, Sander lucioperca and Gasterosteus aculeatus, but not Rhodus sericeus.

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Its native distribution is European-Siberian. List of all species. It was formerly common in such places but has been displaced by main drainage schemes in rivers, excess siltation, eutrophication and, recently, by the invasive zebra mussel Dreissena polymorpha. The shell color is often pale greenish or brownish. Archived from the original on 27 December Zebra mussels are unable to colonise streams where water flow is significant and it is thought that these streams may act as reservoirs of native mussels which will assist in re-colonisation.

The swan musselAnodonta cygneais a large species of freshwater musselan aquatic bivalve mollusc in the family Unionidaethe river mussels. It differs from Anodonta anatina in being larger shell with straighter, more parallel dorsal and ventral margins; the growth lines of the inner, oldest part of the shell are finer and shallower, and reach the margin.

This species is found in rivers and lakes. In Switzerland in up to m altitude. Species description A very large bivalve shell with a flattened profile and broad, oblong shape. Anodohta cycle Adults are long lived and there is nearly always a good proportion of mature shells present in colonies.

How to see this species Swan mussels can sometimes be seen from fishing stands at the margins of lakes with silty or mud bottoms. It also has a deeper, less flattened shell with the interior more deeply coated with nacre. 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.

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The dorsal upper margin usually lies at an acute angle to the line of the ventral lower margin giving the shell a distinct wedge shape, instead of being almost parallel as in the swan mussel which produces a more oblong shape. Institute of Zoology, Slovak Academy of Sciences. 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.

Home Introduction Selection Criteria:: Artificial lakes are usually reached when infected fishes are brought in, young mussels are rarely dispersed by water birds. Support environmental schemes aimed at reducing diffuse pollution whether from agricultural sources, from inadequate sewage treatment in towns or from the malfunctioning or failure of septic tanks in rural areas.

Show history of this page. Wikimedia Commons has media related to Anodonta cygnea. Retrieved 4 January Down, BT18 0EU; cedar.

Swan mussel – Wikipedia

This is smaller though still a large shell at mm long but usually with a more distinctly angular shape. 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. Pictures of Anodonta cygnea. Why is this species a priority in Northern Ireland? This mussel is associated cygnda relatively unpolluted slow streams and lakes with mud or silt bottoms, habitats which are in universal decline. Malacologica Bohemoslovaca in Czech.

The outlines of shells poking out of the mud anoxonta then be seen with the paired pale siphons appearing between the valves.

Swan mussel Conservation status. Anodonta cygnea Linnaeus ,