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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Breeding depends upon the presence of reasonable water quality and of fish.
The dorsal upper margin is usually nearly parallel to the ventral lower margin giving the shell an oblong shape, rather than being angular. Putting a valve of each species up to strong light separates the two.
Reproductive cycle and strategy of Anodonta anatina (L., 1758): notes on hermaphroditism.
Under this view a better knowledge on the biological features of these animals is extremely important for future conservation and management actions. Retrieved 1 July 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.
Retrieved from ” https: For the sex-ratio and hermaphroditism assessments a variable number of individuals were collected from several anodonya from lakes and aodonta. Generally threatened anoxonta continuous destructions of habitats, water pollutions and agricultural fertilization. Home Introduction Selection Criteria:: 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.
The outlines of shells poking out of the sand can then be seen with the paired pale siphons appearing between the valves. Show history of this page. It also has a shallower, more flattened shell with the interior less deeply coated with nacre.
Similar species See Species Description 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. From Wikipedia, the free encyclopedia.
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.
Anatnia 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 Pictures of Anatinna anatina. After a period of some weeks the glochidia metamorphose and drop off to begin an independent life on the bottom. Shell very variable, usually greenish yellow, brown or black, very solid, often twice as heavy as A.
Gametes were present throughout the reproductive cycle. Nomenclator Zoologicus Neave updated, genera. Support environmental schemes aimed at reducing diffuse pollution whether from agricultural sources, from inadequate sewage treatment in towns or from the malfunctioning anattina failure of septic tanks in rural areas. Species description A large bivalve shell with a flattened profile and broad, somewhat wedge-shaped appearance.
IUCN Red List of Threatened Species
The native distribution of this species is European-Siberian. Host fishes are among others Perca fluviatilis, Gobio gobio and various local species, in N Germany Salmo trutta, Gasterosteus aculeatus and Leuciscus leuciscus.
Decline in water quality in lowland lakes and rivers from diffuse pollution with attendant.
Gametogenesis was continuous in both sexes and germinal epithelium in early stages anagina development. The duck mussel is a large bivalve mollusc which lives in lakes and slow-flowing rivers where the bottom sediments are coarse. 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.
AnimalBase :: Anodonta anatina species homepage
In other projects Wikimedia Commons. Archived copy as title Articles with ‘species’ microformats. 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 Anosonta 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.
Larvae brooding occurred between September and March and main glochidia discharge occurred over a short period weeks in March. Diffuse pollution has affected most areas and dissolved oxygen levels are reduced in many lakes to dangerously low levels in the summer months. Previous studies described A.