Abstract
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.
Highlights
Rivers passing through megacities are exposed to high threat by various anthropogenic activities
The phytoplankton community and nutrient enrichment of Hrazdan River have been studied in the Yerevan District, Republic of Armenia
Optimal pH conditions have been registered at all stations of the studied part of Hrazdan River (Table 2)
Summary
Rivers passing through megacities are exposed to high threat by various anthropogenic activities. Industrial and household wastewater discharge is the common source for organic load into the aquatic ecosystems (Adeyemo et al, 2008). Such a load poses huge risks for all aquatic organisms and, in particular, for phytoplankton communities. The distribution of different algae species depends on interactions between environmental abiotic and biotic factors. Deterioration of environmental conditions due to increased organic matter income leads to obvious changes in phytoplankton community, promoting succession from diatoms to Cyanophyta. The use of phytoplankton as an indicator for ecological status of surface water bodies is widely accepted (Reynolds et al, 2002; Swaminathan, 2003)
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