Spatiotemporal Changes of Cyanobacterial Bloom in Large Shallow Eutrophic Lake Taihu, China

Qin, Boqiang; Yang, Guijun; Ma, Jing; Wu, Tingfeng; Li, Wei; Liu, Lizhen; Deng, Jianming; Zhou, Jian

doi:10.3389/fmicb.2018.00451

Cited by 96 publications

(42 citation statements)

References 58 publications

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“…These declined wind speeds along with consistent wind directions triggered the warming, which caused abrupt changes in water temperature after the tipping point due to higher stratification. Qin et al (2018) mentioned that the slow to moderate wind induced disturbances would help the formation and enlargement of colony size of cyanobacteria through minimizing the mixing and strong stratification at Lake Taihu. Therefore, it can be predicted based on present wind field analysis that slowing down of the winds along with deceased directional variability, algal blooms will be intensified at Lake Taihu.…”

Section: Discussionmentioning

confidence: 99%

Long-term wind induced internal response mechanisms at Meiliang Bay of large, shallow Lake Taihu

Jalil

Zhang

et al. 2020

Ann. Limnol. - Int. J. Lim.

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The internal response of shallow lakes to external factors is very important to investigate for understanding their role in long-term changes of the shallow lake ecosystem. The current study investigated the impacts of long-term wind dynamics on in-lake processes of the degraded shallow lake. The long-term high-frequency wind field, water quality, and Chlorophyll-a data analysis showed that there were two groups of variables found with higher internal similarity at Meiliang bay of large, shallow Lake Taihu. The temporal trends of wind, temperature, and Chl-a found highly consistent while dissolved oxygen (DO), total nitrogen (TN), total phosphorus (TP), suspended solids (SS) and Secchi depth were not significantly correlated in long-term temporal trends analysis. The results showed that Chl-a and other shallow lake ecosystem variables (abiotic) are strongly related to long-term wind field. The changes in nutrients and lower mixing scenarios trigger the growth of Chl-a and onshore lower winds help in the formation of colonies. There was a shift in wind and internal response variables before and after 2006. Wind and internal water quality parameters were highly variable before 2006 whereas, decline in wind speeds along with stable wind directional switching caused intense blooms formation along with thermal stratification (warming) for a longer period of time (after 2006) in the shoreline areas. The current study can help to understand the internal ecosystem response mechanisms in long-term interactions with wind field to control the eutrophication and algal blooms.

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Section: Discussionmentioning

confidence: 99%

Long-term wind induced internal response mechanisms at Meiliang Bay of large, shallow Lake Taihu

Jalil

Zhang

et al. 2020

Ann. Limnol. - Int. J. Lim.

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“…In Lake Taihu, China, Microcystis blooms often occur in summer. M. aeruginosa in Lake Taihu can form a colony [20,25,42]. M. aeruginosa cultured under laboratory conditions is different from natural lakes.…”

Section: Discussionmentioning

confidence: 99%

Control of the buoyancy of Microcystis aeruginosa via colony formation induced by regulating extracellular polysaccharides and cationic ions

et al. 2019

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It is well recognized that gas vesicles influence the buoyancy of Microcystis and control the migration in the water column. Some of Microcystis strains do not have gas vesicles, so these strains cannot obtain buoyancy from them. In this study, we used two types of Microcystis strains such as the non-gas vesicle synthesizing strain M. aeruginosa UTEX-2061 and the gas vesicle synthesizing strain M. aeruginosa NIES-843 in the buoyancy control experiments of M. aeruginosa. By inducing colony formation and calculating the relative buoyancy rate of each strain, it was proven that the colony formation was strictly related to the buoyancy of both Microcystis strains. M. aeruginosa NIES-843 possessing gas vesicles could obtain buoyancy under the lower concentration of calcium and magnesium than M. aeruginosa UTEX-2061 possessing no gas vesicles. With the addition of the extracellular polysaccharides (EPS) extracted from Microcystis blooms into the culture medium, M. aeruginosa NIES-843 and UTEX-2061 could present higher buoyancy at the lowest concentrations of calcium and magnesium. It was suggested that EPS combined with the divalent metal cations such as calcium and magnesium made Microcystis form colony effectively. Calcium and magnesium ions enhanced the ability of colony formation of Microcystis and had a significant influence on buoyancy.

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“…Samples were collected at five sites ( Figure 1) that could be taken as representatives as four main sub-ecotypes of Lake Taihu [43]. Station DPE and ZSB are, respectively, situated on the estuary area of the Dapu river and Yicun river, which are the two greatest inflow rivers of Lake Taihu [38].…”

Section: Study Sitesmentioning

confidence: 99%

Spatiotemporal Variations in Seston C:N:P Stoichiometry in a Large Eutrophic Floodplain Lake (Lake Taihu): Do the Sources of Seston Explain Stoichiometric Flexibility?

Cai

Bai

Tang

et al. 2019

Water

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Although sources of seston are much more complicated in lakes compared to oceans, the influences of different sources on the spatiotemporal variations in seston stoichiometry are still underexplored, especially in large eutrophic floodplain lakes. Here, we investigated seston stoichiometric ratios across a typical large eutrophic floodplain lake (Lake Taihu, East China) over one year. In addition, we used the n-alkane proxies to examine the influence of the seston source on seston stoichiometry variation. Throughout the study, the average value of the C:N:P ratio of 143:19:1 across Lake Taihu was close to the canonical lake's ratios (166:20:1). Similar to other eutrophic lakes, seston C:N ratios varied the least across all environments, but C:P and N:P ratios varied widely and showed a strong decreasing trend in ratios of N:P and C:P from growing season to senescence season. This seasonal change was mainly associated with the decreasing contribution from algal-derived materials in seston pools because the non-algal dominated seston exhibited significantly lower ratios than algal-dominated seston. Furthermore, the spatial heterogeneity of stoichiometric ratios was also related to the seston source. During the senescence season, the terrestrial-dominated seston from agricultural watershed exhibited the lowest ratios in estuary sites compared with other areas. Statistically, the predictive power of environmental variables on stoichiometric ratios was strongly improved by adding n-alkanes proxies. Apart from source indicators, particulate phosphorus (PP) contents also partly explained the spatiotemporal variations in stoichiometric ratios. This study, thus, highlights the utility of multiple-combined n-alkane proxies in addition to simple C:N ratios to get more robust source information, which is essential for interpreting the spatiotemporal variations in seston stoichiometric ratios among eutrophic floodplain lakes and other freshwater ecosystems.

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Spatiotemporal Changes of Cyanobacterial Bloom in Large Shallow Eutrophic Lake Taihu, China

Cited by 96 publications

References 58 publications

Long-term wind induced internal response mechanisms at Meiliang Bay of large, shallow Lake Taihu

Long-term wind induced internal response mechanisms at Meiliang Bay of large, shallow Lake Taihu

Control of the buoyancy of Microcystis aeruginosa via colony formation induced by regulating extracellular polysaccharides and cationic ions

Spatiotemporal Variations in Seston C:N:P Stoichiometry in a Large Eutrophic Floodplain Lake (Lake Taihu): Do the Sources of Seston Explain Stoichiometric Flexibility?

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