Intensive algal sampling berness white sneakers conducted in 2016−2019 in the Xiaodong Hai locality (Hainan Island, South China Sea), yielded a total of 198 benthic macroalgal species and their taxonomic forms (54% reds, 20% browns and 26% greens) and 20 species of Cyanobacteria.The largest number of species belonged to the families Rhodomelaceae, Ceramiaceae and Corallinaceae (Rhodophyta); Sargassaceae and Dictyotaceae (Phaeophyceae); Cladophoraceae and Caulerpaceae (Chlorophyta).The majority (79%) of species inhabiting only the tropics or subtropics were previously recorded and 21% of the species were also inhabiting temperate latitudes.Cosmopolitan algae inhabiting from the tropics to Arctic or Antarctic waters amounted to 14%.The level of maximum similarity of macroalgal species diversity in different years was on average more than 70%, interannual species specificity was kicker pro comp 10 observed only in the group of dominating species in algal turf communities.
The seasonal variability of floras was manifested in a significant decrease in species diversity from the dry season to the rainy and in the change of dominant species in algal turf communities.