Browsing by Author "Ungureanu, Laurentia"

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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”.
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    FISH FAUNA IN GIANH RIVER BASIN, QUANG BINH PROVINCE, NORTH CENTRE VIETNAM
    (CEP USM, 2015) Tuan, Ho Anh; Quang, Ngo Huan; Ungureanu, Laurentia; Bulat, Dumitru
    We carried out 12 field surveys in 2003 - 2011 at 36 study sites and collected 5699 specimens. Over time of analysis, we have identified 181 fish species belong to 139 genera, 64 families of 16 orders of the ichthyofauna in Gianh River, 5 rare species recorded in the Red Book of Vietnam (2007), 84 species having economic value, 68 species in upstream, 64 species distributed in the middle, 61 species in downstream and 100 species in the estuary.
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    ICHTHYOFAUNA OF THE GIANH BASIN FROM VIETNAM
    (2016) Tuan, Ho Anh; Bulat, Dumitru; Ungureanu, Laurentia
    Problema științifică importantă soluționată în teză constă în actualizarea diversității ihtiofaunei și a particularităților de repartiției a speciilor de pești în bazinul flufiului Gianh.Au fost identificate și descrise 3 specii de pești noi pentru știință.Au fos analizate caracterele metrice și meristice ale speciilor capturate.Informația cu privire la speciile de pești a fost sistematizată conform particularităților de repartiție spațială, valorii economice, originii și statutului de raritate desemnat de Lista Roție națională și internațională (IUNCN)
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    MORPHOLOGICAL CHARACTERISTICS FOR CLASSIFICATION OF GENUS MACROPODUS LACÉPÈDE, 1801 IN GIANH RIVER IN THE NORTH CENTRAL PART OF VIETNAM
    (CEP USM, 2015) Tuan, Ho Anh; Quang, Ngo Huan; Ungureanu, Laurentia; Bulat, Dumitru
    Analysis and identification of 57 specimens of genus Macropodus Lacépède collected from Gianh River in Quang Binh province in north center region Vietnam. We have classified three species: Macropodus erythropterus (Frey. & Her., 2002), Macropodus opercularis (Linneaeus, 1758), Macropodus spechti (Schreitmüller, 1936) was first discovered in the study area and north center region Vietnam.