50 Hambaryan L. R. et al.: Peculiarities of Development of Phytoplankton as an Indicator of the Ecological State in Modern Hydrochemical Conditions of Masrik River
that is expressed in a high level of sulfate ions in the water of the river Sotk( II class of pollution) and there is a stable high concentration of chromium along the entire length of the river to its confluence with Lake Sevan( III class of pollution). High concentrations of phosphate( III class) and nitrate( IV class) are the results of influence of domestic wastewater. In the qualitative composition of phytoplankton, more than half( about 53 %) are β-mesosaprobic species – indices of the level of pollution. The presence of blue-green and green algae in the river Masrik also indicates the averagelevel of ecosystem pollution. In terms of phytoplankton biomass, water quality of the river Masrik in different parts of the river, was changed by class- from satisfactorily clean up until contaminated, by category-from slightly contaminated to heavily contaminated. The comparison of water quality in 2013 and 2014 years allows to conclude that the presence of more acidic environment and a high level of organic pollution in 2014 created favorable conditions for the growth and development not only for phytoplankton blooms, but also formacrophytes, which indicates degradation of the ecological conditions of the river.
Acknowledgment
The authors wish to express their thanks to GIS specialist, senior researcher Arakelyan Alexander for technical support in design of this paper.
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