The Effect of a Dam Construction on Subtidal Nematode Communities in the Ba Lai Estuary, Vietnam
Open Access
- 2 April 2020
- Vol. 12 (4), 137
- https://doi.org/10.3390/d12040137
Abstract
Nematode communities and relevant environmental variables were investigated to assess how the presence of a dam affects the Ba Lai estuary benthic ecosystem, in comparison to the adjacent dam-free estuary Ham Luong. Both estuaries are part of the Mekong delta system in Vietnam. This study has shown that the dam’s construction had an effect on the biochemical components of the Ba Lai estuary, as observed by the local increase in total suspended solids and heavy metal concentrations (Hg and Pb) and by a significant oxygen depletion compared to the natural river of Ham Luong. The nematode communities were also different between the two estuaries in terms of density, genus richness, Shannon–Wiener diversity, and dominant genera. The Ba Lai estuary exhibited lower nematode densities but a higher diversity, while the genus composition only slightly differed between estuaries. The results indicate that the present nematode communities may be well adapted to the natural organic load, to the heavy metal accumulation and to the oxygen stress in both estuaries, but the dam presence may potentially continue to drive the Ba Lai’s ecosystem to its tipping point.Keywords
This publication has 34 references indexed in Scilit:
- Determination of Total Free Sulphides in Sediment Porewater and Artefacts Related to the Mobility of Mineral SulphidesAquatic Geochemistry, 2011
- Ecology and Biogeography of Free-Living Nematodes Associated with Chemosynthetic Environments in the Deep Sea: A ReviewPLOS ONE, 2010
- The nematodes of the Thames estuary: Assemblage structure and biodiversity, with a test of Attrill's linear modelEstuarine, Coastal and Shelf Science, 2008
- Effects of Lowhead Dams on Riffle‐Dwelling Fishes and Macroinvertebrates in a Midwestern RiverTransactions of the American Fisheries Society, 2004
- Spatio-temporal structure of the nematode assemblages of the Brouage mudflat (Marennes Oléron, France)Estuarine, Coastal and Shelf Science, 2003
- Intertidal meiofauna of the St Lawrence estuary (Quebec, Canada): diversity, biomass and feeding structure of nematode assemblagesJournal of the Marine Biological Association of the United Kingdom, 2002
- Sediment quality criteria in use around the worldLimnology, 2002
- Size spectra, body width and morphotypes of intertidal nematodes: an ecological interpretationJournal of the Marine Biological Association of the United Kingdom, 1999
- Dams and downstream aquatic biodiversity: Potential food web consequences of hydrologic and geomorphic changeEnvironmental Management, 1996
- Size Frequency Distributions of SedimentsJournal of Sedimentary Research, 1934