The study of seaweeds biomass from intertidal rocky shores of Qeshm Island, Persian Gulf

Rocky shores are one of the most important habitats of marine environment in coastal areas. They host marine organisms including seaweeds because of existence of strong and stable substrate for their growth. Intertidal rocky shores are a prominent feature on coastal areas of Qeshm Island located at the northern part of Strait of Hormuz, In order to study biomass of seaweeds on rocky intertidal flats of this island, 4 stations in the south and 1 station in the northern part of the island were selected and sampling was done for two periods, summer and winter and was done during the low spring tide using a quadrate thrown manually and randomly at three times at upper, middle and lower parts of the flats with three replicates. Altogether 73 species of algae were collected and identified. These include 20 Chlorophyta, 10 Phaeophyta and 43 Rhodophyta. The maximum and minimum algal biomass of all stations was recorded in Salakh (117 g.m-2) and Laft (24 g.m-2) with significant difference between the two stations (P < 0.05). Also, the maximum algal biomass was observed for red algae (126g.m-2).