algae blooms water green surface on the water pollution water nature and environmental with drift and flow at the edge of a lake

algae algal aquatic bacteria biology bloom blooming bubble concept cyanobacteria dieoffs dirty disaster drift ecological ecology ecosystem environment eutrophication filamentous floating flow fresh green growth harmful lake leaf microcystin microorganisms movement natural nature organism pigment plant polluted pollution pond river sea seaweed surface swamp toxic tree waste water waves