2023 Early Hearing Detection & Intervention Conference
March 5-7, 2023 • Cincinnati, OH
6/06/2017 | 12:00 PM - 12:15 PM | Periodic wind mixing enhances cyanobacterial dominance in large, shallow, eutrophic Lake Taihu, China | 306B
Periodic wind mixing enhances cyanobacterial dominance in large, shallow, eutrophic Lake Taihu, China
Harmful blooms of cyanobacteria (CyanoHABs) have increased globally. Cyanobacterial dominance is controlled not only by nutrient supplies but also by physical processes induced by wind. Using field observations and mesocosm bioassay experiments, we investigated the impact of turbulence generated by wind on the phytoplankton community composition in large, shallow eutrophic Lake Taihu, China. During summer, when wind waves were strong in central lake, diatoms and green algae seemed to dominate while cyanobacteria dominated in more sheltered, highly eutrophic Meiliang Bay. Bioassays showed phytoplankton only grew well within the upper 1 meter of the water column in Lake due to high turbidity. Turbulence-induced bioassays showed that diatoms and green algae were favored by continuous turbulent mixing. However, short-term intermittent turbulence enhanced dominance by cyanobacteria. Increased water depth following the early summer monsoon reduced the influence of turbulence on phytoplankton biomass and composition. Climatice changes have led to warming and lower wind speeds in Taihu basin. Resultant enhanced stratification enhanced dominance by buoyant CyanoHAB species. This study suggests that the duration of wind events and their associated hydrodynamics are key factors for cyanobacterial dominance in Taihu.
- C20 Climate Change
- C01 Algae
- S20 Understanding physical controls on cyanobacteria dominance: toward prediction and prevention
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Presenters/Authors
HAI XU
(), Nanjing Institute of Geography & Limnology, Chinese Academy of Sciences, hxu@niglas.ac.cn;
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