Factors affecting the seasonal succession of phytoplankton functional groups in a tropical floodplain reservoir in Vietnam
Phytoplankton communities can be classified into different groups based on physiological, morphological, and ecological functions. In this study, the responses of phytoplankton functional groups (PFGs) to physicochemical variables and hydraulic regimes were investigated and used as ecological indica...
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| Format: | Article |
| Language: | English |
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IWA Publishing
2022-03-01
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| Series: | Aqua |
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| Online Access: | http://aqua.iwaponline.com/content/71/3/401 |
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| author | Thanh Luu Pham Thi Hoang Yen Tran Thanh Thai Tran |
| author_facet | Thanh Luu Pham Thi Hoang Yen Tran Thanh Thai Tran |
| author_sort | Thanh Luu Pham |
| collection | DOAJ |
| description | Phytoplankton communities can be classified into different groups based on physiological, morphological, and ecological functions. In this study, the responses of phytoplankton functional groups (PFGs) to physicochemical variables and hydraulic regimes were investigated and used as ecological indicators in the Tri An Reservoir (TAR), a eutrophic tropical floodplain reservoir located in southern Vietnam. Altogether, 148 phytoplankton taxa were identified and assigned to 16 PFGs; the four predominant PFG groups were M (Microcystis spp.), MP (filamentous cyanobacteria: Oscillatoria spp., and some other diatoms: Gomphonema angustatum, Navicula sp.), J (green algae: Coelastrum spp., Cosmarium spp., Pediastrum spp., Scenedesmus spp., Staurastrum spp., Tetradesmus spp., Tetraëdron spp., and Xanthidium spp.), and P (Closterium spp., Aulacoseira granulata, Fragilaria spp., Pinnularia spp., and Desmidium baileyi). The average PFG biovolume ranged from 79.6 ± 20.2 to 230.1 ± 69.1 mg/L with M being the dominant group. The trophic state index (TSI) indicated that the water condition was light-eutrophic to hyper-eutrophic. It was found that the large water level fluctuation resulted in seasonal nutrient dynamics, with higher nutrient concentrations and higher turbidity during the low water level period and vice versa. The redundancy analysis (RDA) indicated that the nutrient concentrations, water level fluctuation, and mixing regimes were critical factors in the PFG selection in the TAR. Therefore, we assumed that water level fluctuation management coupled with biological competition have the potential to control toxic cyanobacteria in the TAR. In conclusion, the PFGs are suitable for examining the effects of environmental conditions on phytoplankton dynamics in tropical floodplain reservoirs, but their sensitivity to long-term changes in water quality and eutrophication requires further investigation. HIGHLIGHTS
Phytoplankton functional groups (PFGs) in relation to the ecological conditions in a tropical floodplain reservoir were investigated.;
The trophic state index (TSI) ranged from light-eutrophic to hyper-eutrophic conditions.;
Sixteen PFGs were found with the dominant group being M (Microcystis spp.).;
Nutrient concentrations, water level fluctuation, and mixing regimes are critical factors in selecting PFGs in the TAR.; |
| first_indexed | 2024-04-13T07:53:52Z |
| format | Article |
| id | doaj.art-a1b711bb0b6647b38d31b464b20f8797 |
| institution | Directory Open Access Journal |
| issn | 2709-8028 2709-8036 |
| language | English |
| last_indexed | 2024-04-13T07:53:52Z |
| publishDate | 2022-03-01 |
| publisher | IWA Publishing |
| record_format | Article |
| series | Aqua |
| spelling | doaj.art-a1b711bb0b6647b38d31b464b20f87972022-12-22T02:55:28ZengIWA PublishingAqua2709-80282709-80362022-03-0171340141410.2166/aqua.2022.110110Factors affecting the seasonal succession of phytoplankton functional groups in a tropical floodplain reservoir in VietnamThanh Luu Pham0Thi Hoang Yen Tran1Thanh Thai Tran2 Graduate University of Science and Technology, Vietnam Academy of Science and Technology (VAST), 18 Hoang Quoc Viet Street, Cau Giay district, Hanoi 100000, Vietnam Institute of Tropical Biology, Vietnam Academy of Science and Technology (VAST), 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City 700000, Vietnam Institute of Tropical Biology, Vietnam Academy of Science and Technology (VAST), 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City 700000, Vietnam Phytoplankton communities can be classified into different groups based on physiological, morphological, and ecological functions. In this study, the responses of phytoplankton functional groups (PFGs) to physicochemical variables and hydraulic regimes were investigated and used as ecological indicators in the Tri An Reservoir (TAR), a eutrophic tropical floodplain reservoir located in southern Vietnam. Altogether, 148 phytoplankton taxa were identified and assigned to 16 PFGs; the four predominant PFG groups were M (Microcystis spp.), MP (filamentous cyanobacteria: Oscillatoria spp., and some other diatoms: Gomphonema angustatum, Navicula sp.), J (green algae: Coelastrum spp., Cosmarium spp., Pediastrum spp., Scenedesmus spp., Staurastrum spp., Tetradesmus spp., Tetraëdron spp., and Xanthidium spp.), and P (Closterium spp., Aulacoseira granulata, Fragilaria spp., Pinnularia spp., and Desmidium baileyi). The average PFG biovolume ranged from 79.6 ± 20.2 to 230.1 ± 69.1 mg/L with M being the dominant group. The trophic state index (TSI) indicated that the water condition was light-eutrophic to hyper-eutrophic. It was found that the large water level fluctuation resulted in seasonal nutrient dynamics, with higher nutrient concentrations and higher turbidity during the low water level period and vice versa. The redundancy analysis (RDA) indicated that the nutrient concentrations, water level fluctuation, and mixing regimes were critical factors in the PFG selection in the TAR. Therefore, we assumed that water level fluctuation management coupled with biological competition have the potential to control toxic cyanobacteria in the TAR. In conclusion, the PFGs are suitable for examining the effects of environmental conditions on phytoplankton dynamics in tropical floodplain reservoirs, but their sensitivity to long-term changes in water quality and eutrophication requires further investigation. HIGHLIGHTS Phytoplankton functional groups (PFGs) in relation to the ecological conditions in a tropical floodplain reservoir were investigated.; The trophic state index (TSI) ranged from light-eutrophic to hyper-eutrophic conditions.; Sixteen PFGs were found with the dominant group being M (Microcystis spp.).; Nutrient concentrations, water level fluctuation, and mixing regimes are critical factors in selecting PFGs in the TAR.;http://aqua.iwaponline.com/content/71/3/401environmental variablesfloodplain reservoirfunctional groupshydrological conditionswater level fluctuation |
| spellingShingle | Thanh Luu Pham Thi Hoang Yen Tran Thanh Thai Tran Factors affecting the seasonal succession of phytoplankton functional groups in a tropical floodplain reservoir in Vietnam Aqua environmental variables floodplain reservoir functional groups hydrological conditions water level fluctuation |
| title | Factors affecting the seasonal succession of phytoplankton functional groups in a tropical floodplain reservoir in Vietnam |
| title_full | Factors affecting the seasonal succession of phytoplankton functional groups in a tropical floodplain reservoir in Vietnam |
| title_fullStr | Factors affecting the seasonal succession of phytoplankton functional groups in a tropical floodplain reservoir in Vietnam |
| title_full_unstemmed | Factors affecting the seasonal succession of phytoplankton functional groups in a tropical floodplain reservoir in Vietnam |
| title_short | Factors affecting the seasonal succession of phytoplankton functional groups in a tropical floodplain reservoir in Vietnam |
| title_sort | factors affecting the seasonal succession of phytoplankton functional groups in a tropical floodplain reservoir in vietnam |
| topic | environmental variables floodplain reservoir functional groups hydrological conditions water level fluctuation |
| url | http://aqua.iwaponline.com/content/71/3/401 |
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