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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IUCN Red List of Threatened Species
In brief Andoonta 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 anoxonta competes for dissolved oxygen and food Red listed in Ireland as Vulnerable VU and as a Priority Species anodonra 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 anqtina individuals were collected from several populations from lakes and rivers.
Retrieved from ” https: A large bivalve shell found on sandy or gravelly bottoms of lakes and in slow-moving rivers. The duck mussel Anodonta anatina is a species of freshwater musselan aquatic bivalve mollusk in the family Unionidaethe river mussels. Local forms are increasingly threatened by uniform forms introduced with gamefish Falkner Conservation of this species Current action Declaration as a Priority Species. Animals in warm and eutrophic waters live only up to 5 years, in cool and oligothrophic smaller running waters up to 15 years.
Embryonal shell smoother than in A.
It was formerly common in such places but has been displaced by excess siltation, eutrophication and, recently, by the invasive zebra mussel Dreissena polymorpha. Host fishes are among others Perca fluviatilis, Gobio gobio and various local species, in N Germany Salmo trutta, Gasterosteus aculeatus and Leuciscus leuciscus.
List of failure reports. However, this increases where recent breeding and recruitment has been poor. Generally threatened by continuous destructions of habitats, water pollutions and agricultural fertilization. Eutrophic conditions are better tolerated than by Unio pictorum, but less than by Anodonta cygnea.
Index Animalium Sherborn, species and genera until How to see this species Duck mussels can sometimes be seen from fishing stands or jetties on lakeshores where ajodonta bottom is of clean sand or silt.
Zebra mussels are unable to colonise streams in which water flow is significant and it is thought that these anatinaa act as reservoirs of native mussels and assist in re-colonisation of slower-flowing water-bodies. 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.
Why is this species a priority in Northern Ireland? Malacologica BohemoslovacaSuppl. Pictures of Anodonta anatina. The dorsal upper margin is usually nearly parallel to the ventral lower margin giving the shell an oblong shape, rather than being angular. Larvae brooding occurred between September and March and main glochidia discharge occurred over a short period weeks in March. International Union for Conservation of Nature.
Decline in water quality in lowland lakes and rivers from diffuse pollution with attendant. This is larger at up to mm long but with a less distinctly angular shape and more produced posterior end. Oogenesis and spermatogenesis occurred mainly between January and May.
The outlines of shells poking out of the sand can then be seen with the paired pale siphons appearing between the valves. 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. On a still, sunny anodonga look down at the lake bottom with Polaroid glasses or using a glass-bottomed box.
Click on map to open large map in new window. Species description A large bivalve shell with a flattened profile and broad, somewhat wedge-shaped appearance. 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.
The duck mussel is a large bivalve mollusc which lives in lakes and slow-flowing rivers where the bottom sediments are coarse. In this study the reproductive and gametogenic cycle of Anodonta anatina were studied during 2 years in one population as well as the sex ratio and hermaphroditism in six distinct populations, using standard histology. Anodonta anatina Linnaeus 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.
Putting a valve of each species up to strong light separates the two. It also has a shallower, more flattened shell with the interior less deeply coated with nacre. Gametes were present throughout the reproductive cycle. Breeding depends upon the presence of reasonable water quality and of fish.
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