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The genus Dreissena includes freshwater and brackish bivalve mollusc species with Ponto-Caspian origin. It originated about 11 million years ago in the Late Miocene from the region of the Middle and Lower Danube (the former Viennese, Pannonian and Dacian basins) to the present Aegean, Black, Azov, Caspian and Aral Seas. At present the genus is represented by 3 subgenera: Dreissena, Pontodreissena and Carinodreissena.

The species from genus Dreissena are characterized with two stages of development - planktonic larvae and attached adult forms. With the help of strong byssal threads adult dreissenids attach to various hard submerged substrates or often to each other creating dense colonies. They are filter feeders on microscopic plankton organisms and organic particles.
Two of the representatives of the genus, the zebra mussel, Dreissena polymorpha and quagga mussel, Dreissena bugensis, are recognized among the most aggressive aquatic invaders worldwide with strong ecological, economic and social impact. Other representatives, such as Dreissena presbensis and Dreissena blanci, were considered endemic to the ancient tectonic lakes of the Balkan Peninsula.

DREISSENA web site presents information on the morphology, biology, ecological preferences, native and invasive distribution of the four recent Dreissena species found on the Balkan Peninsula. It also informs about the research efforts and research results in the areas of assessment and management of Dreissena species invasions in Bulgaria. The web site provides access to an online GIS database with data on history of Dreissena invasions in Bulgaria, current distribution, infested water basins and status of native and invasive populations.

 

Thе web site is developed with the support from the Bulgarian Science Fund, Ministry of Education, Youth and Science, within the Project “Assessment and Management of Dreissena spp. Invasions in the Bulgarian Water Bodies”, Contract Number: DO-02-283/2008.

 

 

 

 

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This website is developed with support from the Bulgarian Science Fund, Ministry of Education, Youth and Science,
within the Project "Assessment and Management of Dreissena spp. Invasions in the Bulgarian Water Bodies",
Contract Number: DO-02-283/2008.

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