DNA barcoding is one of the widely useful tools to identify the nomenclature of creatures. The target of this study is to identify 5 gastropods and 3 bivalves distributed in the Truong Sa Islands (Spratly Islands) of Vietnam using the 16S rDNA gene of mtDNA. The 16S gene fragment was isolated from the molluscs genome mtDNA by PCR technique. The PCR product was purified and sequenced. The 16S rDNA gene fragment was approximately 600 bp in length. The nucleotides of the 16S rDNA gene fragment were compared with those published on Genbank using the BLAST tool. The results showed that four gastropods named Cypraea tigris Linnaeus, 1758; Mauritia arabica Linnaeus, 1758; Oxymeris maculata Linnaeus, 1758; Drupa morum Röding, 1798; Haliotis ovina Gmelin, 1791 and three bivalves titled Tridacna squamosa Lamarck, 1819; Pinna atropurpurea G.B. Sowerby I, 1825; and Chama congregata Conrad, 1833 were identified. In which, T. squamosa and H. ovinawere classified as Vulnerable in Vietnam’s Red Data Book (2007). C. congregata is mainly distributed in South America, but in the study was first recorded in Vietnam’s sea. Using the 16S rDNA gene to determine molluscs in the Truong Sa Islands (Spratly Islands) of Vietnam contribited to accurately identifying creatures and provided basic data for further research in ecology, evolution and conservation of creatures.
The results of the study on the distribution and environmental characteristics of Peanut Worms (Phascolosoma arcuatum, Gray 1828) in Can Gio mangrove forest show that: Peanut Worms live in the areas which have flood level < 1m, flood time < 30%, the topography from 0.8m to 1.7m and in the depth from 10 cm to 30 cm. They live in the soil from silty clay loam to clay which is quite porous, high humid, from acidic to neutral, organic-rich, heavy salty and less aluminous. The average density of the Peanut Worms is 7.44 individual/m2. Peanut Worms density in mixed mangrove forest is higher than that in planting Rhizophora apiculata forest and depends on the compartments. It is forecasted that the distribution area of Peanut Worms in Can Gio mangrove forest is about 24,323 ha and the caches of Peanut Worms are about from 285,600 kg to 535,500 kg/year.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.