2. Articole

Permanent URI for this collectionhttps://msuir.usm.md/handle/123456789/13413

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Author: search.filters.author.Ungureanu, LaurențiaSubject: search.filters.subject.water quality

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    Diversity and functioning of phytoplankton in the Dubasari water accumulation reservoir [Articol]
    (CEP USM, 2014) Ungureanu, Laurenția; Toderaș, Ion; Tumanova, Daria; Ungureanu, Grigore
    During the period 2009-2011 the Dubasari lake phytoplankton was represented by a total of 90 species and intra-specific taxons, where Bacillariophyta, Cyanophyta and Chlorophyta species are prevailing. Numbers of phytoplankton ranged from6.16 to 13.76 mln.cel/l with the biomass from 4.27 to 18.41 g/m3 in the spring and from2.13 to 35.99 mln.cel/l with the biomass from 7.02 to 24.13 g/m3 in the summer, and from 3.5 to 13.3 mln.cel/l with the biomass from 2.91 to 17.61 during autumn. Share in the phytoplankton numbers belongs to cianofite algae, and in the algal biomass to bacilariofite algae. The maximum intensity of production processes was recorded in the summer, primary production values being located within 0.84 to 9.95 gO2/m-2 24 h. Seasonal and spatial fluctuations in lake primary production are accompanied by fluctuations in phy- toplankton biomass, community structure of plankton algae succession, changes in nutrient elements concentrations and water transparency values oscillations. There were established variations of the saprobe index values within 1.68 to 2.72. Most saprobe index values were within limits of the β-mezosaprobe zone and indicate attribution to the water the quality classes 3a -”satisfactory pure” – 3b “moderately polluted”.
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    STAREA ECOLOGICĂ ȘI IHTIOFAUNA A LACURILOR DIN REZERVAȚIA ȘTIINȚIFICĂ ”PLAIUL FAGULUI”
    (CEP USM, 2024) Bulat, Dumitru; Bulat, Denis; Zubcov, Elena; Ungureanu, Laurenția; Bagrin, Nina; Munjiu, Oxana; Tumanova, Daria; Lebedenco, Liubovi
    The paper represents the results of hydrobiological and hydrochemical research carried out in the lakes located on the territory of the “Plaiul Fagului” scientific reserve. These investigati ons can serve as a model for the ecological inventory of all aquatic ecosystems within the State Protected Natural Areas fund of the Republic of Moldova. For the sustainable exploitation of aquatic resources in natural reserves, continuous scientific monitoring of these aquatic resources is necessary.