2021 Ecosystem Transformation 4 (3), 3–12

Nutrient enrichment and its effect on the phytoplankton community of Hrazdan River in the Yerevan District, Republic of Armenia

Stepanyan L.G.  , Ghukasyan E.Kh.  

The phytoplankton community and nutrient enrichment of Hrazdan River have been studied in the Yerevan District, Republic of Armenia. Water was sampled in spring and summer of 2019. The content of phosphate, ammonium, and nitrite ions were significantly higher downstream of the Yerevan District compared to the stations located upstream. The latter were characterized by higher abundance of diatoms (Melosira varians and Rhoicosphenia curvata), while Oscillatoria limnetica, O. chlorina, and Anabaena sphaerica dominated downstream, reflecting different eutrophic state of the river parts.

L. G. Stepanyan
Institute of Hydroecology and Ichthyology of the Scientific Center of Zoology and Hydroecology, National Academy of Sciences of the Republic of Armenia
P. Sevak str. 7, Yerevan, 0014 Armenia

listeus@mail.ru

E. Kh. Ghukasyan
Institute of Hydroecology and Ichthyology of the Scientific Center of Zoology and Hydroecology, National Academy of Sciences of the Republic of Armenia, director of the institute
P. Sevak str. 7, Yerevan, 0014 Armenia

PhD in Biology
e_ghukasyan@yahoo.com

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