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This research is aimed mainly at the assessment of water quality of several drinking water treatment plants and groundwater wells, from the Danube Delta Biosphere Reserve and the habits of the local population in terms of water consumption and use. Thus, the study highlights the presence and distribution of prokaryotic and eukaryotic assemblages, specifically the algal communities which emerged as a dominant group in the investigated drinking water sources. The spatial variation of the pH, EC, turbidity, dissolved oxygen (DO), temperature, algae species and biomass was measured in five drinking water treatment plants (DWTP) and three groundwater wells from villages located in the Danube Delta Biosphere Reserve. No PCR product was present for either genes coding anatoxin, microcystin and saxitoxin. The bbe- Moldaenke technique identified the presence of sligthly more algal groups, than the light microscopic technique; both methods show clear results: the water treated in the drinking water treatment plants has significant algal biomass. The water quality indicated by the algal communities shows oligo-β-mesosaprobic conditions, despite the high number of taxa and individuals from Sf. Gheorghe and C. A. Rosseti samples, they reflect oligotrophic conditions. [ABSTRACT FROM AUTHOR]

In the present study, we analyzed the algae assemblages and environmental condition in four temporary ponds located in Dobrogea mainland (Babadag Plateau) aiming to reveal the role of those habitats as a support to the breeding period of the amphibians. The outcomes of this study were that the algae community structure and its diversity were high given the changing conditions, with a total number of 75 taxa. The highest number of taxa belonged to the phylum Bacillariophyta and Chlorophyta, driven by: temperature and local hydrology conditions. Some of the native amphibians also use this type of habitats during the breeding period, the local climatic conditions having as effect longer juvenile stages in case of each species (in comparison with the ones of populations, of the same species, present in permanent water bodies from the studied region). The novelty of our study resides in the fact that we obtained data on algae assemblage distributed in temporary ponds, information regarding the type of diversity and a better understanding of ecological value of these habitats. [ABSTRACT FROM AUTHOR]