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Harmful algal blooms: mechanisms, monitoring, and prevention in a rapidly changing world
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Factors influence the successive blooms induced by Noctiluca scintillans and Mesodinium rubrum
P-B1-18
Shuwen Zhang* , College of Life Science, South China Normal University, Guangzhou 510631, PR China
Xiaomin Xia, Laboratory of Marine Bio-resource Sustainable Utilization, South China Sea Institute of Oceanology, Chinese Academy of Sciences, Guangzhou, 510301, PR China
Ying Ke, Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
Shuqun Song, Key Lab of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao, 266071, China
Zhuo Shen, Microbial Ecology and Matter Cycle Group, School of Marine Sciences, Sun Yat-sen University, Zhuhai 519082, China
Shunyan Cheung, Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
Hongbin Liu, Division of Life Science, The Hong Kong University of Science and Technology, Clear Water Bay, Hong Kong SAR, China
Presenter Email: szhangaf@connecu.ust.hk |
| Noctiluca scintillans (Noctiluca) and Mesodinium rubrum bloomed concomitantly or successively from November to December 2014 in Port Shelter, a semi-enclosed bay in Hong Kong. Microscopic observation of microzooplankton and phytoplankton, as well as rRNA gene analysis of picoeukaryotes communities, together with environmental data collected before, during and following the bloom events are used to examine the factors that may have triggered such blooms. Our results showed that the onset of Noctiluca and M. rubrum blooms appeared to be driven initially by physical conditions, but stronger relationships were seen among communities afterwards, indicating that internal feedback mechanisms, including reciprocity, competition, preferential feeding and other predator-prey interactions, strongly influence the progression and demise of Noctiluca and M. rubrum blooms, as well as the structure of the phytoplankton community during and after bloom initiation. Our findings have great implications in coastal zones worldwide that are affected by these two ubiquitous red tide forming species. |
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