| From January 2017 to December 2017, the composition, distribution and seasonal succession of marine macroalgae were investigated in the intertidal zone of Qinhuangdao.The results showed that 41 macroalgae species belonging to 23 genera of 3 phyla were collected and identified, among which, 20 species of 13 genera belonged to Rhodophyta, 9 species of 7 genera belonged to Phaeophyta, and 12 species of 3 genera belonged to Chlorophyta. Number of species belonging to Rhodophyta, Phaeophyta and Chlorophyta accounted for 48.78%, 21.95% and 29.27% of the total, respectively.The largest number (35 species) of macroalgae species was in the intertidal zone of Haigang District, followed by in Beidaihe District (20 species), and in Shanhaiguan District (19 species), number of species belonging to Haigang District, Beidaihe District and Shanhaiguan District accounted for 85.37%, 48.78% and 46.34% of the total species, respectively.The dominant species in spring were Ulva linza, Polysiphonia senticulosa, Undaria pinnatifida, Chorda filum, Desmarestia viridis and Sargassum muticum, those in summer were U.linza, U.Pertusa, Codium fragile, S.muticum, Gelidium divaricatum, Grateloupia subpectinataand Bryopsis corticulans, those in autumn were U. Linza and U. fasciata, and the dominant species in winter was U. linza. The results also showed that there were significant differences in dominant species biomasses at different sampling points in different seasons, the biomass value of U. pinnatifida (4110.8 g·m-2) in Haigang District is maximum while C. filum (92.32 g·m-2) is minimum. |
