Cite this paper:
Zhao Xiangwei, Wei Yuqiu, Sun Jun, Zhang Guicheng, Zhao Liang, Jia Dai. Picophytoplankton from Qinhuangdao coastal waters in spring and summer[J]. Haiyang Xuebao, 2020, 42(2): 106-114

Picophytoplankton from Qinhuangdao coastal waters in spring and summer

Zhao Xiangwei1, Wei Yuqiu1, Sun Jun2,3, Zhang Guicheng2,3, Zhao Liang2,3, Jia Dai2,3
1. Institute of Marine Science and Technology, Shandong University, Qingdao 266237, China;
2. Tianjin Key Laboratory of Marine Resources and Chemistry, Tianjin University of Science and Technology, Tianjin 300457, China;
3. Research Centre for Indian Ocean Ecosystem, Tianjin University of Science and Technology, Tianjin 300457, China
During June and August 2017, two picophytoplankton groups including Synechococcus and picoeukaryotes were found in Qinhuangdao coastal waters, and Synechococcus could be divided into two sub-groups of Synechococcus Ⅰ and Synechococcus Ⅱ. During the sampling period, it was during high-incidence period of brown tide. To investigate the effects of the related environmental factors on the spatical distributions of picophytoplankton in Qinhuangdao coastal waters, we compared their cell abundances, carbon biomass and distributional characteristics during the brown tide. The results showed that the average abundances of picoeukaryotes, Synechococcus Ⅰ and Synechococcus Ⅱ in June were 1.14×104 cell/mL, 4.02×104 cell/mL and 1.04×104 cell/mL, respectively, and the average carbon biomass were 27.22 μg/L, 8.49 μg/L and 2.27 μg/L respectively. While in August, the average abundances of picoeukaryotes, Synechococcus Ⅰ and Synechococcus Ⅱ were 3.27×103 cell/mL, 5.79×104 cell/mL and 2.58×104 cell/mL, and the average carbon biomass were 6.35 μg/L, 13.41 μg/L and 5.83 μg/L respectively. The abundance of picoeukaryotes decreased by an order of magnitude from June to August, indicating that the growth of dominant species of brown tide was limited by high temperature and low nutrients in August. Picoeukaryotes, Synechococcus Ⅰ and Synechococcus Ⅱ showed different distributions in June and August. Synechococcus Ⅰ and Synechococcus Ⅱ increased gradually from estuary to nearshore in June, while picoeukaryotes showed a downward trend. Inversely, picoeukaryotes and Synechococcus Ⅰ showed a decreasing trend from estuary to nearshore in August, and the distribution character of Synechococcus Ⅱ abundance was not obvious in Qinhuangdao coastal waters, mainly existing in surface layer. The results of correlation analysis with related environmental factors indicated that nitrate and ammonium salt were the key factor in controlling the growth of Synechococcus Ⅰ in June while picoeukaryotes was limited by the silicate concentration. There was no significant correlation between Synechococcus Ⅱ and environment factors in June. In August, the growth of picoeukaryotes was affected by a variety of environmental factors, such as nitrate, nitrite, silicate, phosphate, temperature and light while Synechococcus Ⅰ was positively correlated with nitrate. The temperature and light were the key factors affecting the Synechococcus Ⅱ distribution in August.
Key words:    picophytoplankton    brown tide    environmental factors    Qinhuangdao   
Received: 2019-03-12   Revised: 2019-06-13
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