Factors associated with blooms of cyanobacteria in a large shallow lake, China.,Environmental Sciences Europe

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Factors associated with blooms of cyanobacteria in a large shallow lake, China.
Environmental Sciences Europe ( IF 5.9 ) Pub Date : 2018-07-28 , DOI: 10.1186/s12302-018-0152-2
Di Li _{1,

2} , Naicheng Wu ₃ , Song Tang ₄ , Guanyong Su ₅ , Xuwen Li ₂ , Yong Zhang ₂ , Guoxiang Wang ₆ , Junyi Zhang ₇ , Hongling Liu ₁ , Markus Hecker _{8,

9} , John P Giesy _{1,

10,

11,

12} , Hongxia Yu ₁

Affiliation

1State Key Laboratory of Pollution Control and Resource Reuse, School of the Environment, Nanjing University, Nanjing, Jiangsu 210046 China.
Jiangsu Environmental Monitoring Center, Nanjing, Jiangsu 210036 China.
3Department of Hydrology and Water Resources Management, Kiel University, Kiel, 24118 Germany.
4National Institute of Environmental Health, Chinese Center for Disease Control and Prevention, Beijing, 100021 China.
5Jiangsu Key Laboratory of Chemical Pollution Control and Resources Reuse, School of Environmental and Biological Engineering, Nanjing University of Science and Technology, Nanjing, 210094 China.
6School of the Environment, Nanjing Normal University, Nanjing, Jiangsu 210023 China.
Wuxi Environmental Monitoring Center, Wuxi, Jiangsu 214000 China.
8Toxicology Centre, University of Saskatchewan, Saskatoon, SK S7N 5B3 Canada.
9School of Environment and Sustainability, University of Saskatchewan, Saskatoon, SK S7N 5C3 Canada.
10Department of Veterinary Biomedical Sciences and Toxicology Centre, University of Saskatchewan, Saskatoon, SK S7N5B3 Canada.
11Department of Zoology and Center for Integrative Toxicology, Michigan State University, East Lansing, MI 48824 USA.
12School of Biological Sciences, University of Hong Kong, Hong Kong, SAR China.

Background

Eutrophication of freshwater systems can result in blooms of phytoplankton, in many cases cyanobacteria. This can lead to shifts in structure and functions of phytoplankton communities adversely affecting the quality of drinking water sources, which in turn impairs public health. Relationships between structures of phytoplankton communities and concentrations of the toxicant, microcystin–leucine–arginine (MC-LR), have not been well examined in large shallow lakes. The present study investigated phytoplankton communities at seven locations from January to December of 2015 in Tai Lake, and relationships between structures and diversities of phytoplankton communities and water quality parameters, including concentrations of MC-LR and metals, were analyzed.

Results

A total of 124 taxa of phytoplankton were observed, and the predominant taxa were Microcystis sp. and Dolichospermum flos-aquae of Cyanophyta and Planctonema sp. of Chlorophyta. The greatest diversities of phytoplankton communities, as indicated by species richness, Simpson, Shannon–Wiener, the Berger and Parker, and the Pielou evenness indices, were observed in spring. Furthermore, productivity of phytoplankton was significantly and negatively correlated with diversities. These results demonstrated that Simpson, Shannon–Wiener, the Berger and Parker, and the Pielou evenness indices of phytoplankton communities were significantly related to trophic status and overall primary productivity in Tai Lake. In addition, temperature of surface water, pH, permanganate index, biochemical oxygen demand, total phosphorus, arsenic, total nitrogen/total phosphorous ratio, and MC-LR were the main factors associated with structures of phytoplankton communities in Tai Lake.

Conclusion

The present study provided helpful information on phytoplankton community structure and diversity in Tai Lake from January to December of 2015. Our findings demonstrated that Simpson, Shannon–Wiener, the Berger and Parker, and the Pielou evenness indices could be used to assess and monitor for status and trends in water quality of Tai Lake. In addition, MC-LR was one of the main factors associated with structures of phytoplankton communities in Tai Lake. The findings may help to address important ecological questions about the impact of a changing environment on biodiversity of lake ecosystems and the control of algae bloom. Further studies are needed to explore the relationship between MC-LR and phytoplankton communities in the laboratory.

更新日期：2018-07-28

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