cyclist shadow with bicycle standing against river covered with green slush of cyanobacterias

active aquatic atmosphere bacteria bicycle bluegreen bright color cover covered cyanobacteria cyanobacterias cyclist dirt dirty dnepr dnepropetrovsk dnipro ecology ejection evolution flow green greenish hot human landscape light lightgreen mould natural nature outdoor pattern photosynthesis phytoplankton planktonic result river scenery season seasonal seasons shadow slush standing summer surface temperature texture ukrainian warming water