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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Diffuse pollution has affected most areas and dissolved oxygen levels are qnodonta in many lakes to dangerously low levels in the summer months.

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., ): notes on hermaphroditism.

Why is this species a priority in Northern Ireland? The anztina mussel is a large bivalve mollusc which lives in lakes and slow-flowing rivers where the bottom sediments are coarse. An annotated list of the land and freshwater Mollusca of Northern Ireland.

A more acute or short-term threat has been delivered by the invasive zebra mussel which competes for dissolved oxygen and food.

Eutrophic conditions are better tolerated than by Unio pictorum, but less than by Anodonta cygnea. 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 aanodonta distinct populations, using standard histology.

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Species description A large bivalve shell with a flattened profile and broad, somewhat wedge-shaped appearance. Animals in warm and eutrophic waters live only up to 5 years, in cool and oligothrophic smaller running waters up to 15 years.

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

Hermaphroditic animals may occasionally occur. The outlines of shells poking out of the sand can then be seen with the paired pale siphons appearing between the valves. On a still, sunny day look down at the lake bottom with Polaroid glasses or using a glass-bottomed box. The native distribution of this species is European-Siberian.

Retrieved qnodonta July Life cycle Adults are long lived and there is nearly always a good proportion of mature shells present in colonies. Shell very variable, usually greenish yellow, brown or black, very solid, often twice as heavy as A. Home Introduction Selection Anatlna The only other large mussel found in still or nearly still waters is the swan mussel Anodonta cygnea.

Wikimedia Commons has media related to Anodonta anatina. Gametogenesis was continuous in both sexes and germinal epithelium anagina early stages of development.

Duck mussel

Decline in water quality in lowland lakes and rivers from diffuse pollution with attendant. These animals are responsible for important ecosystem services such as recycling nutrients and improving water clarity.

Generally threatened by continuous destructions of habitats, water pollutions and agricultural fertilization. Click on map to open large map in new window.

Host fishes are among others Perca fluviatilis, Gobio gobio anoxonta various local species, in N Germany Salmo trutta, Gasterosteus aculeatus and Leuciscus leuciscus. However, this increases where recent breeding and recruitment has been poor. 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.

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From Wikipedia, the free encyclopedia. A live individual of the duck mussel, Anodonta anatina. 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 anatinw to its competitor.

Freshwater mussels have decreased dramatically in Iberia over the last decades. Retrieved from ” https: It also has a shallower, more flattened shell with the interior less deeply coated with nacre.

Oogenesis and spermatogenesis occurred mainly between January and May.

Swan mussel shells appear to be of even thickness throughout, whereas duck mussel shells are clearly uneven and much thicker and opaque andoonta the lower front end. However, the present study indicates that A.

Embryonal shell smoother than in A. It was formerly common in such places but has been displaced ahodonta excess siltation, eutrophication and, recently, by the invasive zebra mussel Dreissena polymorpha.

This page was last edited on 3 Aprilat Breeding depends upon the presence of reasonable water quality and of fish.