4.3 Article

Effects of Modified Clay on Phaeocystis globosa Growth and Colony Formation

出版社

MDPI
DOI: 10.3390/ijerph181910163

关键词

Phaeocystis globosa; solitary cell; colony; HABs control; modified clay

资金

  1. National Key Research and Development Program of China [2017YFC1404300]
  2. Taishan Scholars Climbing Program of Shandong Province of 2019
  3. Science and Technology Major Project of Guangxi [AA17202020-4]
  4. Shandong Provincial Natural Science Foundation, China [ZR2019QD014]

向作者/读者索取更多资源

P. globosa colonies have resistance to environmental stress, with higher density at MC concentrations below 0.2g/L. Concentrations of MC greater than 0.2g/L can reduce the density of solitary cells and colonies, as well as decrease colony diameter and EPS content.
Phaeocystis globosa is a globally distributed harmful algal blooms (HABs) species dominated by the colonial morphotype, which presents dramatic environmental hazards and poses a threat to human health. Modified clay (MC) can effectively flocculate HAB organisms and prevent their subsequent growth, but the effects of MC on colony-dominated P. globosa blooms remain uncertain. In this paper, a series of removal and incubation experiments were conducted to investigate the growth, colony formation and colony development of P. globosa cells after treatment with MC. The results show that the density of colonies was higher at MC concentrations below 0.2 g/L compared to those in the control, indicating the role of P. globosa colonies in resistance to environmental stress. Concentrations of MC greater than 0.2 g/L could reduce the density of solitary cells and colonies, and the colony diameter and extracellular polysaccharide (EPS) content were also decreased. The adsorption of MC to dissolved inorganic phosphorus (DIP) and the cell damage caused by collision may be the main mechanisms underlying this phenomenon. These results elucidate that the treatment with an appropriate concentration of MC may provide an effective mitigation strategy for P. globosa blooms by preventing their growth and colony formation.

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