thunderclouds over the black sea during blue-green algae blooms (nodularia spumigena)

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