river dnipro covered by cyanobacterias as a result of phytoplankton evolution at hot summer

aquatic atmosphere background bacteria bluegreen color covered cyanobacteria cyanobacterias dirt dirty dnepr dnepropetrovsk dnipro ecology ejection european evolution flow greenish hot industrial july light lightgreen mould natural nature outdoor pattern photo photosynthesis phytoplankton planktonic result river season seasonal summer surface taken temperature ukrainian warming water