ANODONTA ANATINA PDF

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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The duck mussel Anodonta anatina is a species of freshwater musselan aquatic bivalve mollusk in the family Unionidaethe river anodonga.

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. Wikimedia Commons has media related to Anodonta anatina.

Reproductive cycle and strategy of Anodonta anatina (L., 1758): notes on hermaphroditism.

In Switzerland in up to m altitude, usually below m, higher than the other freshwater mussels. However, the present study indicates that A. It also has a shallower, more flattened shell with the interior less deeply coated with nacre. 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.

Putting a valve of each species up to strong light separates the two. The story may 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. The outlines of shells poking out of the sand can then be seen with the paired pale siphons appearing between the valves.

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Previous studies described A. The duck mussel is a large bivalve mollusc which lives in lakes anodontz slow-flowing rivers where the bottom sediments are coarse.

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International Union for Conservation of Nature. Archived from the original on This mussel is associated with relatively unpolluted slow rivers and lakes with sandy or gravelly bottoms, habitats which are in universal decline. 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.

An annotated list of the land and freshwater Mollusca of Northern Ireland. 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. Under this view a better knowledge on the biological features of these animals is extremely important for future conservation and management actions.

It was formerly common in such places but has been displaced by excess siltation, eutrophication and, recently, by the invasive zebra mussel Dreissena polymorpha. By using this site, you aantina to the Terms of Use and Privacy Policy. Shell very variable, usually greenish yellow, brown or anattina, very solid, often twice as heavy as A. Show history of this page.

Duck mussel

Views Read Edit View history. Check-list of the molluscs Mollusca of the Czech Republic. Diffuse pollution has affected most anodontz and dissolved oxygen levels are reduced in many lakes to dangerously low levels in the summer months. 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.

Host fishes are among others Perca fluviatilis, Gobio anatinna and various local species, in N Germany Salmo trutta, Gasterosteus aculeatus and Leuciscus leuciscus.

AnimalBase :: Anodonta anatina species homepage

Retrieved 1 July Nomenclator Zoologicus Neave updated, genera. Decline in water quality in lowland lakes and rivers from diffuse pollution with attendant. Why is this species a priority in Northern Ireland?

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Embryonal shell smoother than in A. Generally threatened by continuous destructions of habitats, water pollutions and agricultural fertilization.

The shell is thin and pale, whitish or pearly inside due to a thin layer of nacre, but protected by a periostracum outside which gives it a smooth, glossy green, sometimes brown appearance marked with strong concentric growth lines. Gametes were present throughout the reproductive cycle. Gametogenesis was continuous in both sexes and germinal epithelium in early stages of development.

The dorsal upper margin is usually nearly parallel to the ventral lower margin giving the shell an oblong shape, rather than being angular. Anodonta anatina Linnaeus Local forms are increasingly threatened by uniform forms introduced with gamefish Falkner On a still, sunny day look down at the lake bottom with Polaroid glasses or using a glass-bottomed box.

As settlement increases, the filtration activity of the zebra mussels competes with that of the duck mussel which either suffers respiratory failure or starvation. The parasitic larvae are called glochidia and are produced in spring and carried by the current until they contact a bottom-living fish.

In this study the reproductive and gametogenic cycle of Anodonta anatina were studied during 2 years in one snodonta as well as the sex ratio and hermaphroditism in six distinct populations, using anatiina histology.

IUCN Red List of Threatened Species

Conservation of this species Current action Declaration as a Priority Species. Zebra mussels are unable to colonise streams in which water flow is significant and it is thought that these may act as reservoirs of native mussels and assist in re-colonisation of slower-flowing water-bodies.

After a period of some weeks the glochidia metamorphose and drop off to begin an independent life on the bottom.