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BIOLOGICAL RESEARCH ON THE DANUBE WATER QUALITY IN THE BAZIAS - PRISTOL SECTOR


AURA LUNGU, LUMINIŢA GALASIU, VIOLETA ASTRATINEI, FLORENTINA VINTILÄ‚

Issue:

SCSB, Volume X

Section:

Ecology, Limnology

Abstract:

The description of surface water quality is a widely used procedure within various environmental protection works and it can be understood on the base of qualitative and quantitative structure of trophic compartments studied in biological analyses.

To describe as objectively as possible the ecological state of an aquatic ecosystem it is necessary to know the two main components, the abiotic (biotop) and the biotic (biocenosis) as well as their interrelationships.

Biological analysis implies the knowledge of all responses of living beings towards environment; the result is a selection of the best adapted organisms to life conditions.

Aquatic flora and fauna can be used to estimate water quality as they respond to the action of different biotic or abiotic, natural or anthropic factors.

The bacteriological assessment of freshwater ecosystems such as Danube River is strongly required by the new EU regulations (Water Frame Directive/2000) as a significant parameter, which indicates the ecological changes in the natural state of rivers (JDS, 2002).

Inadequately treated wastewater released into aquatic ecosystems can carry bacteria, viruses, protozoa and Helminthes that cause a wide variety of diseases ranging from gastroenteritis and infectious hepatitis to typhoid fever and chronic anemia (Astratinei, 2000).

In this study bacterial indicators such as total coliforms, faecal coliforms (thermotolerant coliforms -E. coli) and Faecal streptococci (enterococci) were applied for the assessment of the Danube water quality.

According to the EU Framework Directive of Waters 60/2000, the quality of aquatic ecosystems cannot be measured and determined only by physico- chemical indicators; the response of ecosystems should be measured biologically and evaluation methods should take into consideration the factors that determine the structure and functionality of the aquatic ecosystems.

Keywords:

lotic ecosystems, planktonic associations, biotop, biocenosis, bacteriological indicators.

Code [ID]:

SCSB200510V10S04A0001 [0002545]


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