Impact of a dam construction on the intertidal environment and free-living nematodes in the Ba Lai, Mekong Estuaries, Vietnam

• Published in: Environmental Monitoring and Assessment Vol. 194; no. Suppl 2; p. 770
• Main Authors: Quang, Ngo Xuan, Yen, Nguyen Thi My, Thai, Tran Thanh, Yen, Nguyen Thi Hai, Van Dong, Nguyen, Hoai, Pham Ngoc, Lins, Lidia, Vanreusel, Ann, Veettil, Bijeesh Kozhikkodan, Hiep, Nguyen Duc, Bang, Ho Quoc, Quan, Nguyen Hong, Prozorova, Larisa
• Format: Journal Article
• Language: English
• Published: Cham Springer Science and Business Media LLC 01.09.2022; Springer International Publishing; Springer Nature B.V
• Subjects: Ammonium; Ammonium Compounds; Animals; Atmospheric Protection/Air Quality Control/Air Pollution; Brackishwater environment; Carbon; coliform bacteria; Coliforms; Composition; Construction; Dam construction; Dams; Dissolved oxygen; Dissolved solids; E coli; Earth and Environmental Science; Ecology; Ecotoxicology; Environment; Environmental Management; Environmental Monitoring; Environmental science; Escherichia coli; Estuaries; Eutrophication; Fluvial sediments; free-living nematodes; Geologic Sediments; Hydrogen; Hydrogen Sulfide; Hydrogen sulphide; Impact prediction; Intertidal environment; littoral zone; Methane; Monitoring/Environmental Analysis; Nematoda; Nematodes; Nitrates; Nitrogen; Nutrients; Organic carbon; Organic phosphorus; Oxygen; Phosphorus; Rivers; sediments; Siltation; Solid suspensions; Sulphides; Suspended particulate matter; Topical Collection on Environmental sustainability and impacts of climate change in the Mekong delta region; Total dissolved solids; total nitrogen; Total organic carbon; total phosphorus; Total suspended solids; Vietnam; Waste materials; Water Pollutants, Chemical; Vietnam; Ben Tre; Climate change; Irrigation; Nematode; Reservoir; Ba Lai River; Environmental impact
• ISSN: 0167-6369; 1573-2959; 1573-2959
• DOI: 10.1007/s10661-022-10187-5

The impact of high siltation and accumulation of organic and waste material in the intertidal of the dammed Ba Lai River in Vietnam as part of the Mekong estuarine system was investigated by means of marine free-living nematodes. Nutrients content (nitrate, ammonium, total phosphorus, total nitrogen), total suspended solids, total organic carbon, coliform, bacteria E. coli , pH, dissolved oxygen, total dissolved solids, methane and hydrogen sulfide concentration, and the nematode communities were characterized in sediment at selected stations along the river above and below the dam. Our results found elevated methane concentrations at the upstream side of the dam while hydrogen sulfide concentrations found to be highest in the downstream side of the dam. Furthermore, methane and hydrogen sulfide concentrations were correlated to nematode community characteristics such as trophic composition densities and genera composition. There was a clear difference between the communities above and below the dam. The discontinuous nematode community distribution indicated that the Ba Lai River is impacted by dam construction. Potentially the high deposition and eutrophication could turn the area into a methane-rich area related to predicted impact on nematodes.