Mechanisms of high-frequency dinoflagellate blooms of Scrippsiella trochoidea in Daya Bay,South China Sea  

作　　者：Yuan TIAN Simin HU Xianzhi LIN Hui HUANG Xingyu SONG Yan YAN Xuedong XIE Tao LI Sheng LIU 

机构地区：[1]Key Laboratory of Tropical Marine Bio-resources and Ecology,Guangdong Provincial Key Laboratory of Applied Marine Biology,South China Sea Institute of Oceanology,Chinese Academy of Sciences,Guangzhou 510301,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]Tropical Marine Biological Research Station in Hainan,Chinese Academy of Sciences,Sanya 572000,China [4]Nansha Marine Ecological and Environmental Research Station,Chinese Academy of Sciences,Guangzhou 510301,China [5]Guangdong Ocean and Fishery Environment Monitoring and Forecasting Center,Guangzhou 510222,China

出　　处：《Journal of Oceanology and Limnology》2021年第4期1293-1304,共12页海洋湖沼学报（英文）

基　　金：Supported by the Strategic Priority Research Program of the Chinese Academy of Sciences(Nos.XDA13020102,XDA13020104);the National Key Research and Development Project of China(Nos.2016YFC0502800,2017YFC0506302);the National Natural Science Foundation of China(No.41806188);the Science and Technology Planning Project of Guangdong Province,China(Nos.2015A020216013,2017B0303014052)。

摘　　要：Harmful algal blooms(HABs),such as dinoflagellate blooms,have adverse eff ects on coastal water environments,causing seafood contamination and aquaculture economic losses.Based on historical HAB records data(1983-2017)and phytoplankton data(1982-2008),field investigation and laboratory experiments on frequently bloomed dinoflagellate species,we analyzed the possible mechanisms of high frequency dinoflagellate blooms in Daya Bay,South China Sea.The HAB records data show that the proportion of dinoflagellate blooms increased from 15% before 1994 to 77.27% after 2011.The bloom occurred mostly in summer(57.58%)in Yaling Bay(76.92%).The species inducing dinoflagellate blooms tended to be singular over time,with high proportion of Scrippsiella trochoidea(42.86%-88.88%).Laboratory experiment and field investigation of S.trochoidea bloom showed that this species grew rapidly at 30℃ and 32.1℃(r=0.47,P<0.05),respectively.Results indicate that temperature rise in Yaling Bay was aff ected by nearby nuclear plant effluent,which favored the S.trochoidea bloom.Coincidently,nearly 70% of S.trochoidea blooms occurred in about 7 days after local spring tide and strong wind(wind velocity>7 m/s),which disturbed the resting cysts in the sediment and bring them into surface layer.Taking into account of environmental parameters,algae source,and atmospheric conditions,the probable mechanism of S.trochoidea bloom could be explained.The cysts were resuspended by the spring tide or strong wind,germinated at the bottom layer,reproduced rapidly at higher temperature,and then aggregated in the inner bay(Yaling Bay),resulting the frequent S.trochoidea bloom.Considering the influences of global warming and human activities,it should be taken more attention that dinoflagellate blooms might increase along the coastal waters.

关 键 词：harmful algal blooms DINOFLAGELLATE Daya Bay Scrippsiella trochoidea 

分 类 号：X17[环境科学与工程—环境科学] X55