algae float on the surface of the water in the black sea, a toxic blue-green algae (nodularia spumigena

bloom algae toxic black sea bluegreen spumigena alga algal pollution bacteria blue green cell chlorophyll colony cyanobacteria cyanobacterium ecological disaster genus interference micro microbiology microorganism microscopic nodularia pellicle phytoplankton plankton plant protozoa singlecelled toxin underwater water