Species name: Anodonta anatina (Linnæus, ). Anodonta-anatina_jpg are better tolerated than by Unio pictorum, but less than by Anodonta cygnea. A more oval shell than A. cygnea, with umbos nearly central. Periostracum glossy , more often green than brown. The shell is thicker in front than behind and. Anodonta anatina (L., ) Family: Unionidae. The duck mussel is a large bivalve mollusc which lives in lakes and slow-flowing rivers where the bottom.
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Articles with Czech-language external links All articles with dead external links Articles with dead external links from December Articles with permanently dead external links CS1 maint: Decline in water quality aanodonta lowland lakes and rivers from diffuse pollution with attendant.
Retrieved 1 July However, this increases where recent breeding and recruitment has been poor. For the sex-ratio and hermaphroditism assessments a variable number of individuals were anodonga from several populations from lakes and rivers.
Anodonta anatina duck mussel :: Northern Ireland’s Priority Species ::
Gametes were present throughout the reproductive cycle. Eutrophic conditions are better tolerated than by Unio pictorum, but less than by Anodonta cygnea.
The duck mussel is a large bivalve mollusc which lives in lakes and slow-flowing rivers where the bottom sediments are coarse. Species description A large bivalve shell with a flattened profile and broad, somewhat wedge-shaped appearance.
Anodonta anatina Linnaeus Animals in warm and eutrophic waters live only up to 5 years, in cool and oligothrophic smaller running waters up anxtina 15 years. After a period of some weeks the glochidia anatinna and drop off to begin an independent life on the bottom. On a still, sunny day look down at the lake bottom with Polaroid glasses or using a glass-bottomed box.
List of all species. A live individual of the duck mussel, Anodonta anatina. As settlement increases, the filtration activity of the zebra mussels competes with that of the duck mussel which either suffers respiratory failure or starvation.
This is larger at up to mm long but with a less distinctly angular shape and more produced posterior end. Wikimedia Commons has media related to Anodonta anatina. Under this view a better xnatina on the biological features of these animals is extremely important for future anodonha and management actions. Index Animalium Sherborn, species and genera until Overall, this study indicates that for more efficient conservation actions and management plans, freshwater mussel reproductive biology should be studied at the population level mainly in the subfamily Anodontinae.
However, the present study indicates that A. The native distribution of this species is European-Siberian.
The parasitic larvae are called glochidia and are produced in spring and carried by the current until they contact a bottom-living fish. Click on map to open large map in new window. Although self-fertilization was not confirmed, additional studies with molecular characterization of larvae using fast evolving markers should be used in future studies to enlighten this process. Duck mussel A live individual of the duck mussel, Anodonta anatina Conservation status.
From Wikipedia, the free encyclopedia. It was formerly common in such places but has been displaced by excess anofonta, eutrophication and, recently, by the invasive zebra mussel Dreissena polymorpha. Why is this species a priority in Northern Ireland? Calm rivers, river bays, lakes, creeks, in muddy or sandy substrate, usually m deep, not below 20 m, tolerates slightly faster water currents than A.
Gametogenesis was continuous in both sexes and germinal epithelium in early stages of development. A large bivalve shell found on sandy or gravelly bottoms of lakes and in slow-moving rivers. Pictures of Anodonta anatina. Size and age of maturity depends on water temperatures, annodonta in warm waters reach maturity after wnatina years, in cold waters they need up to 5 years and the shells stay smaller. International Union for Conservation of Nature. The story anatjna not end there, however, as the zebra mussel infestation is now waning and there is hope that the duck mussel can regain some of the territory lost to its competitor.
Anodonta piscinalis Nilsson, Generally threatened by continuous destructions of habitats, water pollutions and agricultural fertilization. How to see this species Duck mussels can sometimes be seen from fishing stands or jetties on lakeshores where the bottom is of clean sand or silt.
Duck mussel – Wikipedia
In Switzerland in up to m altitude, usually below m, higher than the other freshwater mussels. Freshwater mussels have decreased dramatically in Iberia over the last decades. It can reach 80 mm in length and has a nearly straight dorsal upper or hinge margin which is usually at an acute angle to the ventral lower margin. The shell is thin and pale, whitish or pearly abodonta due to a thin layer of nacre, but protected by a periostracum outside annodonta gives it a smooth, glossy green, sometimes brown appearance marked with strong concentric growth lines.
Threatened both in Ireland and Europe by diffuse pollution and the resultant periodic de-oxygenation of waters. The zebra mussel impacts duck mussels indirectly, by settling on their shells which often provide the only hard substrate in many waterways.
Views Read Edit View history. Host fishes are among others Perca fluviatilis, Anosonta gobio and various local species, in N Germany Salmo trutta, Gasterosteus aculeatus and Leuciscus leuciscus.
Previous studies described A. Putting a valve of each species up to strong light separates the two.
A more acute or short-term threat has been delivered by the invasive zebra mussel which competes for dissolved oxygen and food.
This mussel is associated with relatively unpolluted slow rivers and lakes with sandy or gravelly bottoms, znodonta which are in universal decline. Retrieved from ” https: