(nodularia spumigena), ecological disaster, a toxic blue-green algae bloom in the black sea

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