Phytoplankton are an important part of biodiversity and one of the bases of food networks in freshwater, brackish and marine environments. This study was carried out to record the algal flora (microalgae and macroalgae) in Togo in terms of floristic diversity, intra- and inter-family abundance, classes and primary phyla. For the microalgae, after sampling the water, the phytoplankton were immediately fixed to a concentrated lugol’s solution, and kept later for identification by examination with a light microscope adapted to a light room and a camera connected to a computer. For the macroalgae, the collections concern essentially the seaweeds along the beach and at the level of rockfill zones or other hard substrates in the littoral seaboard of the Atlantic Ocean.

The phytoplankton settlements were followed at 6 stations for 2 years on the Togolese littoral zone. Currently, 446 species are found variously distributed according to different seasons.

This study aims to model the variability of those species according to seasons and depending on the physicochemical factors of the aquatic environments, of all known taxa. Particularly, the identification of the factors controlling the dynamics and the structure of phytoplankton communities are necessary to understand the presence and the development of harmful or toxic species.