Seasonal changes in phytoplankton assemblages and environmental variables in highly turbid tropical estuaries of the Mekong River, Vietnam
- Author
- Yen Tran Thi Hoang, Thai Tran Thanh, My Yen Nguyen (UGent) , Quang Ngo Xuan, Dong Nguyen Xuan and Thanh Luu Pham
- Organization
- Abstract
- The distribution of phytoplankton assemblages in response to physicochemical variables was assessed using Spearman's correlation and canonical correspondence analysis in four highly turbid estuaries of the Mekong River (MKR) system in Ben Tre Province, Vietnam. During two surveys (September 2017 and April 2018) at 20 sampling sites, a total of 162 species were recorded, with a dominance of diatoms (> 50%). Phytoplankton abundance varied from 3.01 x 10(5) to 11.85 x 10(5) cells/L, with the highest cell densities found at the BL2 station in the rainy season, mainly attributed to cyanobacteria during the rainy period, whereas diatoms were dominant in the dry season. Chlorophyll-a concentration in this area was low and decreased from the mouth stations. Similarity analysis distinguished the freshwater and oligohaline regions (characterized by lower phytoplankton abundance in the oligohaline areas) from the mesohaline and polyhaline zones (characterized by higher phytoplankton density in the polyhaline sections), based on the salinity gradient, which mostly explained the spatio-temporal distribution of phytoplankton. In which, freshwater and oligohaline sites were dominated by the diatom Coscinodiscus, the euglenoids Lepocinclis, and the green alga Scenedesmus in the rainy season, while mesohaline and polyhaline stations were dominated only by diatom species (Thalassionema and Skeletonema) in the dry season. High salinity and total dissolved solutes, and low nutrients are the major factors affecting phytoplankton growth and lead to low density and low primary biomass in turbid estuarine systems like the MKR estuaries. Our results further emphasize the importance of taking into account of salinity in understanding seasonal changes of phytoplankton communities, which can provide a valuable baseline data for ecological management strategies in tropical estuarine ecosystems.
- Keywords
- COMMUNITY, DIVERSITY, WATERS, COAST, BAY, Phytoplankton distribution, Tropical coastal system, CCA analysis, Spearman's correlation
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-01H2139PWMDZHWDY7EYMC518CM
- MLA
- Tran Thi Hoang, Yen, et al. “Seasonal Changes in Phytoplankton Assemblages and Environmental Variables in Highly Turbid Tropical Estuaries of the Mekong River, Vietnam.” ENVIRONMENTAL MONITORING AND ASSESSMENT, vol. 194, no. SUPPL 2, 2022, doi:10.1007/s10661-022-10181-x.
- APA
- Tran Thi Hoang, Y., Tran Thanh, T., Nguyen, M. Y., Ngo Xuan, Q., Nguyen Xuan, D., & Pham, T. L. (2022). Seasonal changes in phytoplankton assemblages and environmental variables in highly turbid tropical estuaries of the Mekong River, Vietnam. ENVIRONMENTAL MONITORING AND ASSESSMENT, 194(SUPPL 2). https://doi.org/10.1007/s10661-022-10181-x
- Chicago author-date
- Tran Thi Hoang, Yen, Thai Tran Thanh, My Yen Nguyen, Quang Ngo Xuan, Dong Nguyen Xuan, and Thanh Luu Pham. 2022. “Seasonal Changes in Phytoplankton Assemblages and Environmental Variables in Highly Turbid Tropical Estuaries of the Mekong River, Vietnam.” ENVIRONMENTAL MONITORING AND ASSESSMENT 194 (SUPPL 2). https://doi.org/10.1007/s10661-022-10181-x.
- Chicago author-date (all authors)
- Tran Thi Hoang, Yen, Thai Tran Thanh, My Yen Nguyen, Quang Ngo Xuan, Dong Nguyen Xuan, and Thanh Luu Pham. 2022. “Seasonal Changes in Phytoplankton Assemblages and Environmental Variables in Highly Turbid Tropical Estuaries of the Mekong River, Vietnam.” ENVIRONMENTAL MONITORING AND ASSESSMENT 194 (SUPPL 2). doi:10.1007/s10661-022-10181-x.
- Vancouver
- 1.Tran Thi Hoang Y, Tran Thanh T, Nguyen MY, Ngo Xuan Q, Nguyen Xuan D, Pham TL. Seasonal changes in phytoplankton assemblages and environmental variables in highly turbid tropical estuaries of the Mekong River, Vietnam. ENVIRONMENTAL MONITORING AND ASSESSMENT. 2022;194(SUPPL 2).
- IEEE
- [1]Y. Tran Thi Hoang, T. Tran Thanh, M. Y. Nguyen, Q. Ngo Xuan, D. Nguyen Xuan, and T. L. Pham, “Seasonal changes in phytoplankton assemblages and environmental variables in highly turbid tropical estuaries of the Mekong River, Vietnam,” ENVIRONMENTAL MONITORING AND ASSESSMENT, vol. 194, no. SUPPL 2, 2022.
@article{01H2139PWMDZHWDY7EYMC518CM,
abstract = {{The distribution of phytoplankton assemblages in response to physicochemical variables was assessed using Spearman's correlation and canonical correspondence analysis in four highly turbid estuaries of the Mekong River (MKR) system in Ben Tre Province, Vietnam. During two surveys (September 2017 and April 2018) at 20 sampling sites, a total of 162 species were recorded, with a dominance of diatoms (> 50%). Phytoplankton abundance varied from 3.01 x 10(5) to 11.85 x 10(5) cells/L, with the highest cell densities found at the BL2 station in the rainy season, mainly attributed to cyanobacteria during the rainy period, whereas diatoms were dominant in the dry season. Chlorophyll-a concentration in this area was low and decreased from the mouth stations. Similarity analysis distinguished the freshwater and oligohaline regions (characterized by lower phytoplankton abundance in the oligohaline areas) from the mesohaline and polyhaline zones (characterized by higher phytoplankton density in the polyhaline sections), based on the salinity gradient, which mostly explained the spatio-temporal distribution of phytoplankton. In which, freshwater and oligohaline sites were dominated by the diatom Coscinodiscus, the euglenoids Lepocinclis, and the green alga Scenedesmus in the rainy season, while mesohaline and polyhaline stations were dominated only by diatom species (Thalassionema and Skeletonema) in the dry season. High salinity and total dissolved solutes, and low nutrients are the major factors affecting phytoplankton growth and lead to low density and low primary biomass in turbid estuarine systems like the MKR estuaries. Our results further emphasize the importance of taking into account of salinity in understanding seasonal changes of phytoplankton communities, which can provide a valuable baseline data for ecological management strategies in tropical estuarine ecosystems.}},
articleno = {{776}},
author = {{Tran Thi Hoang, Yen and Tran Thanh, Thai and Nguyen, My Yen and Ngo Xuan, Quang and Nguyen Xuan, Dong and Pham, Thanh Luu}},
issn = {{0167-6369}},
journal = {{ENVIRONMENTAL MONITORING AND ASSESSMENT}},
keywords = {{COMMUNITY,DIVERSITY,WATERS,COAST,BAY,Phytoplankton distribution,Tropical coastal system,CCA analysis,Spearman's correlation}},
language = {{eng}},
number = {{SUPPL 2}},
pages = {{15}},
title = {{Seasonal changes in phytoplankton assemblages and environmental variables in highly turbid tropical estuaries of the Mekong River, Vietnam}},
url = {{http://doi.org/10.1007/s10661-022-10181-x}},
volume = {{194}},
year = {{2022}},
}
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