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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Why is this species a priority in Northern Ireland? Putting a valve of each species up to strong light separates the two. Species description A large bivalve shell with a flattened profile and broad, somewhat wedge-shaped appearance.
The dorsal upper margin is usually nearly parallel to the ventral lower margin giving the shell an oblong shape, rather than being angular. Local forms are increasingly threatened by uniform forms introduced with gamefish Falkner Embryonal shell smoother than in A.
Gametogenesis was continuous in both sexes and germinal epithelium in early stages of development. Views Read Edit View history. Eutrophic conditions are better tolerated than by Unio pictorum, but less than by Anodonta cygnea.
Hermaphroditic animals may occasionally occur. Breeding depends upon the presence of reasonable water quality and of fish. 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. The only other large mussel found in still or nearly still waters is the swan mussel Anodonta cygnea.
In this study the reproductive and gametogenic cycle of Anodonta anatina were studied during 2 years in one population as anoodnta as the sex ratio and hermaphroditism in six distinct populations, using standard histology.
Wikimedia Commons has media related to Anodonta anatina. Decline in water quality in lowland lakes and rivers from diffuse pollution with attendant.
WoRMS – World Register of Marine Species – Anodonta anatina (Linnaeus, )
Threatened both in Ireland and Europe by diffuse pollution and the resultant periodic de-oxygenation of waters. The native distribution anatins this species is European-Siberian.
Swan mussel shells appear to be of even thickness throughout, whereas duck mussel shells are clearly uneven and much thicker and opaque towards the lower front end. From Wikipedia, the free encyclopedia.
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. Index Animalium Sherborn, species and genera until Malacologica BohemoslovacaSuppl. In brief A large bivalve shell found on sandy or gravelly bottoms of lakes and in slow-moving rivers 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 Species description A large bivalve shell with a flattened profile and broad, somewhat wedge-shaped appearance.
For the sex-ratio and hermaphroditism assessments a variable number of individuals were collected from several populations from lakes and rivers. These animals are responsible for important ecosystem services such as recycling nutrients and improving water clarity. Conservation of this species Current action Declaration as a Priority Species. Archived from the original on 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.
Reproductive cycle and strategy of Anodonta anatina (L., 1758): notes on hermaphroditism.
Size and age of maturity depends on water temperatures, animals in warm waters reach maturity after 2 years, in cold waters they need up to 5 years and the shells stay smaller. This mussel is associated with relatively unpolluted slow rivers and lakes with sandy or gravelly bottoms, habitats which are in universal decline. However, the present study indicates that A. International Union for Anodonat of Nature. Generally threatened by continuous destructions of habitats, water pollutions and agricultural fertilization.
On a still, sunny day look down at the lake bottom with Polaroid glasses antina using a glass-bottomed box.
Duck mussel – Wikipedia
It can reach 80 mm in length and has a nearly straight dorsal upper or hinge margin which is usually andoonta an acute angle to the ventral lower margin. The duck mussel is a large bivalve mollusc which lives in lakes and slow-flowing rivers where the bottom sediments are coarse.
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