Browsing by Author "Tumanova, Daria"

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DIVERSITY AND FUNCTIONING OF PHYTOPLANKTON IN THE DUBASARI WATER ACCUMULATION RESERVOIR
(CEP USM, 2014) Ungureanu, Laurentia; Toderas, 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 from 6.16 to 13.76 mln.cel/l with the biomass from 4.27 to 18.41 g/m3 in the spring and from 2.13 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 phytoplankton 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”.
INFLUIENȚA RÂURILOR RĂUT, BÂC ȘI BOTNA ASUPRA COMPONENȚEI FITOPLANCTONULUI ȘI CALITăȚII APEI SECTORULUI INFERIOR AL FL. NISTRU
(CEP USM, 2024) Ungureanu, Laurenţia; Tumanova, Daria
The article presents the results of the investigations on diversity and quantitative parameters of planktonic algae in three rivers: Raut, Bâc and Botna, which are the tributaries of the Dniester River. In tributaries of Dniester River phytoplankton was represented by the four groups: Cyanophyta, Bacillariophyta, Euglenophyta and Chlorophyta. It was established that the biggest negative effect on the Dniester River influences the water coming from the Bâc River according to the quantitative parameters (number of species and biomass) of phytoplankton as well as the saprobity index of planktonic algae. The values of the saprobic index of this tributary fell within the limits of water quality classes III (polluted). The water quality of the Răut and Botna tributaries according to the values of the saprobic index, being assigned to class II (moderately polluted).
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.
STRUCTURA TAXONOMICĂ ȘI CANTITATIVĂ A FITOPLANCTONULUI - INDICATOR SEMNIFICATIV AL STĂRII ACTUALE A RÂULUI PRUT
(Editura USM, 2023) Ungureanu, Laurenţia; Tumanova, Daria; Ungureanu, Grigore
Articol prezintă rezultatele studiului indicatorilor calitativi și cantitativi ai fitoplanctonului râului Prut pe teritoriul Republicii Moldova în perioada anilor 2020-2023. În compoziția fitoplanctonul râului au fost identificate 101 specii. Conform rezultatelor acestor studii, s-a stabilit că compoziția fitoplanctonului s-a format în principal din algele diatomei și verzi. Efectivul numeric a fitoplanctonului a variat în limitele 0,33-26,14 mln. cel/l cu biomasă 0,42-20,63 g/m3. Conform valorilor biomasei fitoplanctonului râul Prut poate fi atribuit categoriei ecosistemelor „mezotrofe” periodic „eutrofe”. În componenţa fitoplanctonului rîului Prut predomină speciile β-mezosaprobe în proporție de 55 %, iar conform valorilor indicelui saprobic al fitoplanctonului calitatea apei rîului în perioada 2020-2023 se atribuie claselor calității apei II-III (bună-poluată moderat).