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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Why is this species a priority in Northern Ireland? 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.
The swan musselAnodonta cygneais a large species of freshwater musselan aquatic bivalve mollusc in the family Unionidaethe river mussels. Home Introduction Cyynea Criteria:: Retrieved cyhnea ” https: Breeding depends upon the presence of reasonable water quality and of fish.
Wikimedia Commons has media related to Anodonta cygnea. The shell color is often pale greenish or brownish.
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. Prefers muddy substrate bare of vegetation. As settlement increases, the filtration activity of the zebra mussels competes with that of the swan mussel which either suffers respiratory failure or starvation. Archived from the original on 27 December This species is found in rivers and lakes.
Similar species The only other large mussel found in still or nearly still waters is the duck mussel Anodonta anatine. How to see this species Swan mussels can sometimes be seen from fishing stands at the margins of lakes with silty or mud bottoms.
Embryonal shell finely striated along the growth lines, the lines reach the margin. Diffuse pollution has affected its habitat in most areas and dissolved oxygen is cjgnea in many to dangerously low levels in the summer months.
AnimalBase :: Anodonta cygnea species homepage
An annotated list of anldonta land and freshwater Mollusca of Northern Ireland. Occasionally found in Spain and Portugal in artificially disturbed habitats, where infected fishes from central Europe were released. Pictures of Anodonta cygnea. This is ycgnea though still a large shell at mm long but usually with a more cygnez angular shape.
The geographical distribution of this species is naodonta the British Isles east to Siberia, and south into northern Africa. Index Animalium Sherborn, species and genera until Threatened both in Ireland and Europe by diffuse pollution and the resultant periodic de-oxygenation of waters.
Threatened cygnda continuous destruction of habitats, water current regulations, exaggerated pollution by fertilizers, also by natural drying out of waters. Archived from the original on 14 February The Swedish Museum of Natural History.
Putting a valve of the shell up to strong light separates these two species. Zebra mussels are unable to colonise streams where water flow ajodonta significant and it is thought that these streams may act as reservoirs of native mussels which will assist in re-colonisation.
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Glochidia are mature in autumn, are released in cygnda in England and in Italytheir size 0. 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.
A more acute or short-term threat has been delivered by the invasive zebra mussel which competes for dissolved oxygen and food. Host fishes for glochidia are Salmo trutta, Perca fluviatilis, Leuciscus leuciscus, Sander lucioperca and Gasterosteus aculeatus, but not Rhodus sericeus.
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They will then drop off after a period of weeks and find a suitable place on the bottom to begin an independent life. Views Read Edit View history. This mussel is associated with relatively unpolluted slow streams and lakes with mud or silt bottoms, habitats which are in universal decline.
The zebra mussel impacts swan mussels indirectly, by settling on their shells which provide the only hard substrate in many waterways.
Retrieved 4 January A very large bivalve shell found in silty or muddy backwaters of streams, rivers and lakes. Click on map to open large map in new window. Nomenclator Zoologicus Neave updated, genera. 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. Institute of Zoology, Slovak Academy of Sciences. Swan mussel Conservation status.
The outlines of shells poking out of the mud can then be seen with the paired pale siphons appearing between the valves. This page was last edited on 4 Octoberat Lakes, old river arms, artificial lakes, needs silent waters, only rarely in running waters, usually in lowlands. In Switzerland in up to m altitude. Its native distribution is European-Siberian. 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. Anodontaa brief A very large bivalve shell found in silty or muddy backwaters 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 dissolved oxygen and food Red listed in Ireland as Vulnerable VU and as a Priority Species in Northern Ireland Ccygnea description A very large bivalve shell with a flattened profile and broad, oblong shape.