Spatial and temporal variation of diversity seaweed (rhodophyceae, chlorophyceae and Phaeophyceae) in the Marchica lagoon (North-East Morocco)

Abstract The present work is mainly devoted to determine the distribution spatio-temporel seaweeds inventory of the Marchica lagoon. Several sampling campaigns, carried out at the Marchica lagoon (October 2014, January, April, July 2015, and July 2017), had the following objectives: To study the diversity Seaweeds (macroalgal) in different zones of the Marchica lagoon (north-eastern of Morocco), and stadies the spatio-temporal variation of the Marchica algae. The results obtained provided the identification of about 59 algae species inventories, with the dominance of rhodophyceae Ceramieae C. Agardh is a highly diverse group in terms of number of taxa followed by chlorophyceae and fucophyceae. Chlorophyceae make up the majority of the stand during the spring period, but during the summer period the stand experiences a decrease in chlorophyceae and an increase in rhodophyceae. Rhodophyceae (Gracilaria) are the most abundant seaweeds species at the continental edge, near Oued Tirkâa, at the southeast and south of the lagoon. However, chlorophyceae and rhodophyceae (Gracilaria) are located in large quantities near the new pass. While for the fucophyceae, we noticed the new species of C. barbata, which is not found by González and Conde (1991).