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You are here: Home » Past Issues » Volume 5, 2010 - Number 2 » ECOLOGIC CHARACTERIZATION OF THE FLUVIATILE LIMANS IN THE SOUTH-WEST DOBRUDJA AND THEIR ECONOMIC IMPLICATIONS (ROMANIA)


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Gheorghe T. ROMANESCU1, Cristina I. DINU2, Adina L. RADU3 & Liliana I. TÖRÖK4
1University “Al.I.Cuza” of Iasi, Faculty of Geography and Geology, Department pf Geography, Bd.Carol I, 20A, 700505, Iasi, Romania, Tel.0040 744774652, Fax.0040 232 201481, e-mail: geluromanescu@yahoo.com; gheorghe.romanescu@uaic.ro.
2Eco-Museal Research Institute Tulcea, Danube Delta Ecotouristic Center, 14 Noiembrie, no.1, 820009, Tel./fax + 40 240 515866, e-mail: dinupopcristina@yahoo.com, www.3d-center.ro.
3Eco-Museal Research Institute Tulcea, Danube Delta Ecotouristic Center, 14 Noiembrie, no.1, 820009, Tel./fax + 40 240 515866, e-mail: cornigerius@yahoo.com, www.3d-center.ro..
4Danube Delta National Institute for Research and Development, Babadag no.165, 820112 Tulcea, Tel. + 40 240 524546, Fax: + 40 240 533 547, e-mail: lilianatorok@indd.tim.ro, www.indd.tim.ro

ECOLOGIC CHARACTERIZATION OF THE FLUVIATILE LIMANS IN THE SOUTH-WEST DOBRUDJA AND THEIR ECONOMIC IMPLICATIONS (ROMANIA)

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Abstract: The altimetric and granulommetric proofs, as well as their shape, include them in the category of typical fluviatile limans from this point of view. The four analysed lakes contain fresh water with a higher mineralization than the Danube. The increase of concentration corresponds to the periods in which the connection with the river is interrupted. The marshes Vederoasa and Iortmac have a higher salt content due to underground supply. Due to its chemical properties, the water of all marshes are included in the class of bicarbonated waters – calcium group, when they are supplied by the Danube, or sodium group, when the connection with the river is interrupted and a chemical metamorphosis process takes place (Bugeac, Oltina, Dunareni marshes), or magnesium group when water supply comes from own sources (Vederoasa, Iortmac and Baciu marshes). The structure of vegetation in the lacustrine cuvettes included five aquatic associations and four swamp associations. The lakes vegetation cover degree has percentages between 10-90%. The greatest plankton amount is found at the junction between the lakes and the supply channels coming from the Danube. The reduced species diversity reflects the answer of the fish population to the changes of the environmental conditions.

Keyword: fluviatile limans, evolution, ecology, fishing industry


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