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Harmful algal blooms: mechanisms, monitoring, and prevention in a rapidly changing world
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Effect of a diatom on colony formation in the harmful bloom-forming species Phaeocystis globosa
P-B1-09-S
Qi Liu* , School of Life Sciences, Xiamen University, Xiamen 361102, China
Fang Han, School of Life Sciences, Xiamen University, Xiamen 361102, China
Lu Huang, School of Life Sciences, Xiamen University, Xiamen 361102, China
Chang-Ping Chen, School of Life Sciences, Xiamen University, Xiamen 361102, China
Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China
Lin Sun, State Key Laboratory of Marine Environment Science, Xiamen University, Xiamen 361102, China
Ya-Hui Gao, School of Life Sciences, Xiamen University, Xiamen 361102, China
State Key Laboratory of Marine Environment Science, Xiamen University, Xiamen 361102, China
Corresponding author:gaoyh@xmu.edu.cn
Jun-Rong Liang, School of Life Sciences, Xiamen University, Xiamen 361102, China
Key Laboratory of the Ministry of Education for Coastal and Wetland Ecosystems, Xiamen University, Xiamen 361102, China
Corresponding author: sunljr@xmu.edu.cn
Presenter Email: 897043466@qq.com |
| The prymnesiophyte Phaeocystis globosa, a dimethylsulfide (DMS) producer, often forms a large area harmful algal bloom, playing an important role in global sulphur and carbon cycle. P. globosa has a unique polymorphic life cycle that can alternate between single and colonial stage, and cooccurrence of diatoms with P. globosa in the latter is a common phenomenon in the ocean. Despite the significant contribution of colony formation to the bloom formation and development, the roles of diatoms that may interact with colony formation of P. globose still suffer from a sketchy knowledge. In the present study, a diatom species Ditylum brightwellii was co-grown with P. globosa in the cultures with different cell density ratio (P. globosa: D. brightwellii =1:1, 10:1, 50:1, or 100:1) in order to investigate the effects of the diatom on colony formation of P. globosa. The proportion of P. globosa colonial cells, average colony size, and number of colonies were enumerated. The results showed that diatom D. brightwellii could promote colony formation and increase colony size at early stage of colony formation when P. globosa was in a relative low initial cell density of 103 cells mL-1. Colony number and the diameter of P. globosa colony were improved by the diatom in early and late growth stages when the density ratio of the P. globosa to D. brightwellii was at least 10:1. When the density ratio of P. globosa to D.brightwellii was 100:1, the mean colony size increased up to 25% relative to the controls. The mean colony number of P. globosa was also increased up to 50% when the density ratio of P. globosa to D.brightwellii was 50:1.The findings suggested that diatom could play a role in colony formation of P. globose.
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