Algoflora of the northern littoral part of the Azerbaijani sector of the Caspian Sea (Siyazan and Shabran districts)

Although studies on the algoflora of the Azerbaijani sector of the Caspian Sea have been conducted since the 60s of the 20th century, very little information is available about the diversity and distribution areals of algae in this sea.The paper presents the results of the study of the diversity, taxonomic structure, and ecological characteristics of marine macrophytes and microscopic algal flora of the Caspian Sea shores in the northeastern part of the Azerbaijan Republic (the territory of Siyazan and Shabran regions).28 species of algae belonging to 4 divisions, 14 orders, 16 families, and 21 genera were identified in the research area.Their belonging to divisions Bacillariophyta (13 species), Chlorophyta (6 species), Cyanophyta (5 species), and Charophyta (4 species) was established.The Bacillariophyta division is the dominant group in the composition of the studied algal flora with 46.4%, Chlorophyta constitutes 21.4%, Cyanophyta -18%, and Charophyta-4.2%.Naviculaceae, Oscillatoriaceae, Spirogyraceae, and Cladophoraceae were found to be the leading families in algal flora.Out of 28 algae species detected, 22 species were found to be new to the research area.