Taxonomic structure of benthic diatoms' communities in spring in six sites of Oued beht and Oued r'dom (Morocco)

ABSTRACT The present work is concerned with the determination of an inventory of diatoms of two rivers of Morocco, Oued Beht and Oued R'dom to the levels of two riverine cities Sidi Slimane and Sidi Kacem. The harvested spring algal flora is composed of 93 species and varieties of species belonging to 11 orders of which the most represented in families are the orders of the Naviculales and Cocconeidales. In total 16 families are identified, which are subdivided into 25 genera. The families of Fragilaceae, Gomphonemataceae, Naviculaceae, Bacillariaceae, Achanthaceae have two genera each. The genera specifically the more rich are Nitzschia, Navicula and Gomphonema. The taxonomic structure of diatomic communities varies significantly from upstream to downstream of the riverine cities studied, but the variation is clearer when one considers the abundance of species. 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