Diversity of Green Macroalgae Genus Ulva (Chlorophyta) in Hai Phong and Potential Uses

The knowledge of marine algae species composition is imperative not only for understanding the structure, function and biogeographical affinities but also for planning strategies for marine algae conservation and management. This study was carried out to determine the diverse species and evaluate some use-values of green macroalgae from genus Ulva in Hai Phong, where many different habitats such as estuarine floodplains, lagoons or small bays and diverse in the bottom (hard, sandy, sandy-mud bottom). Ulva samples were collected at 11 sites in 5 areas in 2021. Based on the results of species composition, were identified 11 species of the genus Ulva. The species composition of the genus Ulva in Hai Phong accounted for 73.3% of the total species recorded in Vietnam; accounting for 19.6% of the total number of Asian species, and 12.9% of the total number of Ulva species in the world. The Cluster and MDS (Multi-Dimensional Scaling analysis) on the similarity in vertical distribution and geographical distribution among the studied species. Based on the active ingredients and uses value, the studied determined 9 species of genus Ulva in Hai Phong were identified with economic value.