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Anqi ZHANG, Honghan LIU, Chenhong LI, Changping CHEN, Junrong LIANG, Lin SUN, Yahui GAO. Relationship between toxic and harmful microalgae and environmental factors in typical mariculture areas of East China Sea[J]. Journal of Oceanology and Limnology, 2022, 40(6): 2401-2415

Relationship between toxic and harmful microalgae and environmental factors in typical mariculture areas of East China Sea

Anqi ZHANG1, Honghan LIU1, Chenhong LI1, Changping CHEN1,3, Junrong LIANG1,3, Lin SUN2, Yahui GAO1,2,3
1 School of Life Sciences, Xiamen University, Xiamen 361102, China;
2 State Key Laboratory of Marine Environmental Science, Xiamen University, Xiamen 361102, China;
3 Key Laboratory of Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China
Toxic and harmful algal blooms are usually more frequent in mariculture areas due to the abundant trophic conditions. To investigate the relationship between toxic and harmful microalgae and environmental factors, we set up 12 stations near three mariculture regions (Gouqi Island, Sandu Bay, and Dongshan Bay) in the East China Sea. We collected samples from all four seasons starting from May 2020 to March 2021. We identified 199 species belonging to 70 genera, of which 38 species were toxic and harmful, including 24 species of Dinophyceae, 13 species of Bacillariophyceae, and 1 species of Raphidophyceae. The species composition of toxic and harmful microalgae showed a predominance of diatoms in the summer (August), and dinoflagellates in the spring (May), autumn (November), and winter (March). The cell densities of toxic and harmful microalgae were higher in summer (with an average value of 15.34×103 cells/L) than in other seasons, 3.53×103 cells/L in spring, 1.82×103 cells/L in winter, and 1.0×103 cells/L in autumn. Pseudonitzschia pungens, Prorocentrum minimum, Paralia sulcata, and Prorocentrum micans were the dominant species and were available at all 12 stations in the three mariculture areas. We selected 10 toxic and harmful microalgal species with frequency >6 at the survey stations for the redundancy analysis (RDA), and the results show that NO3-, water temperature (WT), pH, DO, and NO3- were the main factors on distribution 2 of toxic and harmful microalgae. We concluded that the rich nutrient conditions in the East China Sea mariculture areas increased the potential for the risk of toxic and harmful microalgal bloom outbreaks.
Key words:    phytoplankton|toxic and harmful microalgae|environmental factors|mariculture areas|East China Sea (ECS)   
Received: 2022-03-14   Revised:
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