Identification of cyanobacteria species that populate the Algerian coasts

Cyanobacteria, whose ancestral representatives are at the origin of oxygen photosynthesis, are major players in the evolution and ecology of living communities and play a major role in the oxygen cycle. The frequency and intensity of cyanobacterial efflorescence has increased in recent decades. This increase is mainly attributed to the impact of anthropogenic pressures that led to the increasing eutrophication of water bodies and the creation of favorable cyanobacterial aquatic environments and to a lesser extent, the effects of climate change favoring the development of cyanobacteria. Four main genera of potentially toxin-producing cyanobacteria form efflorescence in mid-water bodies: Planktothrix, Microcystis, Anabaena and Aphanizomenon. These genera have ecological characteristics of their own and are not found in the same type of environment and / or at the same time of the year.