Phytoplankton of the middle Caspian Sea: analysis of changes in the structure of the community over the past decades

Aim . Analysis of changes in quantitative and structural indicators phytoplankton the western central part middle Caspian Sea over past decades, including according to remote sensing data. Material Methods The data was obtained 2004–2008 2019–2022 at different seasons year 40 stations Sea. Phytoplankton samples were taken from 4–6 layers. A total 300 analyzed. Determination species counting number cells carried out under “Ergaval” light microscope. WoRMS guided matters nomenclature. Results spring is dominated by traditional for – Cyclotella caspia diatoms Prorocetrum micans dinoflagellates. maximum abundance C. (5.0 x 10 4 cell/l) recorded depths 35–40 m. In summer, biomass (2.2 g/m 3 ) noted seasonal thermocline formed due small flagellates during winter blooms reached 4.5–5.0 determined development (up 96–99%). Winter diatom sea, as well Pseudo?nitschia seriata Cerataulina pelagica species. Conclusion It shown that Sea, autumn are characterized a highly productive status. January–February, periodic observed, confirmed satellite situ observations. mass dinoflagellates layer, which has not been methods. main role played component, represented mainly alien