The abundance and seasonal dynamics of phytoplankton community of the middle course part of Hrazdan River in 2018

Abstract

Seasonal studies of phytoplankton community in the middle course part of Hrazdan River were performed in 2018. Eighty species of algae from 6 groups were identified. Diatoms were the dominant and Cyanophytas – subdominant group of the river’s phytoplankton community. Maximum abundance of algae was registered in autumn. The river is considered “moderately polluted” according to the Shannon – Weaver water quality index and mainly “beta-mesosaprobic” based on the level of organic pollution according to the saprobic index.

Keywords

• hrazdan river
• phytoplankton community
• abundance
• water quality
• saprobity index