Vietnam Academy of Science and Technology

Project's information

Project's title	Taxonomic diversity of Nematodes and other Meiofauna on Con Dao and Tho Chu islands of South Vietnam
Project’s code	QTRU01.11/21-22
Research hosting institution	Institute of Ecology and Biological Resources
Coordinating unit, co-chair	Shirshov Institute of Oceanology, Russian Academy of Scienc
Project leader’s name	Nguyen Dinh Tu and MOKIEVSKY Vadim Olegovich
Project duration	01/06/2021 - 31/03/2024
Project’s budget	200 million VND
Classify	Excellent
Goal and objectives of the project	- To characterize the biodiversity of meiofauna communities and focusing on the free-living marine Nematodes in different ecosystems (Seagrass, Coral...) in coastal areas shore at Con Dao and Tho Chu Island. - To descriptions of new nematode species, new records and characteristic species (if any) in ecosystems by morphology, molecular and scanning electron microscopy. - To improve knowledge for young sceincetis concern meiobenthos.
Main results	- In Con Dao, the results of analyzing the composition of Meiobenthos groups at 10 sampling sites (5 sites in the intertidal area and 6 sites around the base of mangrove trees) showed that nematodes are an almost perfect treatment group. for 97.12%, the number of individuals ranged from 570 ± 23 (TC1) to 1344 ± 420 (TC2), followed by the Crustacean group (Harpacticoids) and the least Kynorhyncha group (0.1%). For Tho Chu Island, it shows that the composition of the Meiobenthos groups at the 5 sampling locations has been classified and quantified, the nematode community is an almost dominant group, the number of individuals ranges from 703 ± 597 (at tidal flat) to 549 ± 207 (in the area around the base of the mangrove), followed by the copepods (Harpacticoids) and the least Kynorhyncha. - For the Nematode community in Con Dao, we have identified 67 species belonging to 26 families in 7 orders. Among these 67 species, Cyatholaimus sp. 1 with the highest proportion (20.04%), followed by Prochromadorella sp. 1 (15.45%). The remaining other species account for from 0.02 to 6.04%. The Chromadoridae family has the highest number of individuals (28.23%), followed by the Cyatholaimidae family (22.39%), the Draconematidae family (8.32%), and the lowest are the Ceranomatidae, Enoplidae and Siphonolaimidae families (1 %). On Tho Chu island, the results of the project have identified 100 species, 81 genera, 29 families and 6 orders. In which the Chromadorida Filipjev, 1929 has the highest number of varieties (40 genus), followed by the Monhysterida Filipjev, 1929 (23 genus), the Enoplida Filipjev, 1929 has the highest number of varieties (17 genus) and the lowest is Order Dorylaimida Pearse, 1929 (1 genus). - In addition, the research results of the project have published 05 new species and 01 recorded species for science (Corononema vulgaris Nguyen, T.X.P., et al., 2023; Hofmaenneria coralis Nguyen, T.X.P., et al., 2023; Onyx vulgaris Gagarin, V.G & Nguyen, D.T., 2023; Desmodora coralis Gagarin, V.G & Nguyen, D.T., 2023; Metachromadora (Bradylaimus) tenuis Gagarin, V.G & Nguyen, D.T., 2023; Spirinia laevioides (Gerlach, 1963) Gagarin, V.G & Nguyen, D.T., 2023.
Novelty and actuality and scientific meaningfulness of the results	The meiobenthos and nematodes fauna from Coral reef, Sea grass bed and Mangroves in Con Dao and Tho Chu Islands and their community structure had been investigated. In addition, our young scientists have a great opportunity to enhance their background through the international cooperation and the scientific exchange between the Institute of IEBR and Shirshov Institute of Oceanology, Russian Academy of Sciences.
Products of the project	- Publications: 05 1. Nguyen Thi Xuan Phuong, Phan Ke Long, Tran Thi Viet Thanh, Gagarin, V. G., Mokievsky V. O., and Nguyen Dinh Tu, 2023. Corononema vulgare sp. n. and Hofmaenneria coralis sp. n. (Nematoda, Monhysterida) from coral reefs off the coast of Vietnam. Zootaxa 5380 (1): 067–076. 2. Gagarin V. G. and Nguyen Dinh Tu. Two new for science species of free-living nematodes of family Desmodoridae Filipjev, 1922 (Nematoda, Desmodorida) from coral reefs in Vietnam. Transactions of Papanin Institute for Biology of Inland Waters RAS. 104: 39-48. 3. Gagarin V. G. and Nguyen Dinh Tu. Metachromadora (Bradylaimus) tenuis sp. n. and Spirinia laevioides Gerlach, 1963 (Nematoda, Desmodorida) from coral reefs in Vietnam. Transactions of Papanin Institute for Biology of Inland Waters RAS. 102: 25-35. 4. Mokievski V. O. Tchesunov A. B. Nguyen Vu Thanh and Nguyen Dinh Tu. Meiobenthos as a monitoring tool: The role of seasonality. Proceeding of the XVII International Conference MSOI-2021, Vol. II – Moscow, 2021. 254 – 258. The article has been accepted for publication in 2024: 5. Mokievsky V.O., Tchesunov A.V., Kondar D.V., Garlitska L.A., Nguyen Dinh Tu and Nguyen Thi Xuan Phuong. 2024. Meiobenthos of Con Dao Islands: Differences in Communities’ Structure between reef-flat and mangroves. Oceanology. (Accepted). - Other products: 01 Decision No. 2055/QD-HVKHCN dated November 30, 2022 on recognition of PhD students of the Academy of Science and Technology.
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