Cite this paper:
QIU Lixia, YU Zhiming, CAO Xihua, JI Hena, SONG Xiuxian. The mechanism of a new type of modified clay controlling Phaeocystis globosa growth[J]. Journal of Oceanology and Limnology, 2020, 38(4): 1270-1282

The mechanism of a new type of modified clay controlling Phaeocystis globosa growth
QIU Lixia1,2,3,4, YU Zhiming1,2,3,4, CAO Xihua1,2,4, JI Hena1,2,3,4, SONG Xiuxian1,2,3,4
1 CAS Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 Laboratory of Marine Ecology and Environmental Science, Qingdao National Laboratory for Marine Science and Technology, Qingdao 266071, China;
3 University of Chinese Academy of Sciences, Beijing 100049, China;
4 Center for Ocean Mega-Science, Chinese Academy of Sciences, Qingdao 266071, China
Abstract:
Phaeocystis globosa is a harmful algal bloom (HAB) species worldwide. Using modified clay (MC) to control HABs and to mitigate their adverse effects is currently a commonly used method in China. In this paper, the effects of oxidized composite modified clay (OXI-MC) on P. globosa were studied from different perspectives. The results show that the OXI-MC could effectively remove P. globosa and inhibit both the growth of residual algal cells and the formation of new colonies. The P. globosa algal biomass removal efficiencies after 3 h reached 90% at a dose of 0.1 g/L, and the number of colonies with different particle sizes was greatly reduced. Compared with those of the control, the superoxide dismutase (SOD) activity, catalase (CAT) activity, and malondialdehyde (MDA) content of the residual algae significantly increased, indicating that OXI-MC caused oxidative stress in the algal cells. In addition, we evaluated the effects of OXI-MC on the photosynthesis of residual microalgae and found that the maximal photochemical efficiency of photosystem Ⅱ (PSⅡ) under dark adaptation (Fv/Fm) and actual photochemical efficiency of PSⅡ (ФPSⅡ) decreased, severely damaging the photosynthesis efficiency, implying that OXI-MC effected the photosynthesis system of P. globosa. The results of this study clarify that OXI-MC could remove the most of algal cells and break up the colonies of P. globosa by collision, flocculation, and releasing active substances, as well as inhibit effectively the growth and colony formation of residual P. globosa by causing oxidative stress, reducing photosynthesis activity, accelerating the degradation of polysaccharides, and inhibiting the formation of colonies.
Key words:    Phaeocystis globosa|modified clay|colony disruption|oxidative stress|photosynthesis   
Received: 2020-01-19   Revised: 2020-03-19
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