Algal blooms of haptophyte Phaeocystis globosa have been recorded in the Beibu Gulf,South China Sea(SCS)since 2011.Recent evidence suggests that Type Ⅰ and Type Ⅳ are the two dominant genotypes of P.globosa coexisting in this area,and their marker pigment profiles,colony sizes,and genetic information differ.Two genotype-specific quantitative polymerase chain reaction(qPCR)assays were used to clarify the distribution and dynamics of P.globosa bloom in the Beibu Gulf from November 2018 to February 2019.Results show that the patterns of spatial-temporal distribution of Type Ⅰ and Type Ⅳ were similar,the abundance of Type Ⅳ was higher than that of Type Ⅰ during the algal bloom,and thus Type Ⅳcells dominated the P.globosa bloom in winter 2018.The relationships between environmental factors and P.globosa abundance indicated that temperature and nitrate were critical to the distribution and dynamics of P.globosa blooms in this area.The distribution of P.globosa cells in different water masses before the bloom revealed that the westward water via the Qiongzhou Strait,the SCS bottom water,and the current in the northwestern waters of Hainan Island could transport P.globosa cells into the Beibu Gulf serving as the seed sources triggering the intense blooms in the Beibu Gulf.

Zhuang NIU;Weibing GUAN;Jinxiu WANG;Yongquan YUAN;Fanzhou KONG;Chao LIU;Qingchun ZHANG;Rencheng YU

CAS Key Laboratory of Marine Ecology and Environmental Sciences,Institute of Oceanology,Chinese Academy of Sciences,Qingdao 266071,China;Laboratory for Marine Ecology and Environmental Science,Pilot National Laboratory for Marine Science and Technology(Qingdao),Qingdao 266237,China;Center of Ocean Mega-Science,Chinese Academy of Sciences,Qingdao 266071,China;University of Chinese Academy of Sciences,Beijing 100049,China;State Key Laboratory of Satellite Ocean Environment Dynamics,Second Institute of Oceanography,Ministry of Natural Resources,Hangzhou 310012,China;School of Oceanography,Shanghai Jiao Tong University,Shanghai 200030,China

海洋湖沼学报（英文版）

[1]Zhuang NIU;Weibing GUAN;Jinxiu WANG;Yongquan YUAN;Fanzhou KONG;Chao LIU;Qingchun ZHANG;Rencheng YU-.Dynamics of Phaeocystis globosa bloom and implications for its seed sources in the Beibu Gulf,China)[J].海洋湖沼学报（英文版）,2022(06):2385-2400

haptophyte,Qiongzhou

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