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Environ Monit Assess ; 194(Suppl 2): 770, 2022 Oct 18.
Artigo em Inglês | MEDLINE | ID: mdl-36255542

RESUMO

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.


Assuntos
Compostos de Amônio , Sulfeto de Hidrogênio , Nematoides , Poluentes Químicos da Água , Animais , Estuários , Monitoramento Ambiental , Poluentes Químicos da Água/análise , Nitratos , Vietnã , Escherichia coli , Fósforo/análise , Nitrogênio/análise , Carbono , Metano , Oxigênio , Sedimentos Geológicos/química
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