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CAO Xihua, YU Zhiming, WU Zaixing, CHENG Fangjin, HE Liyan, YUAN Yongquan, SONG Xiuxian, ZHANG Jianle, ZHANG Yongfeng, ZHANG Wanlei. Environmental characteristics of annual pico/nanophytoplankton blooms along the Qinhuangdao Coast[J]. HaiyangYuHuZhao, 2018, 36(2): 281-292

Environmental characteristics of annual pico/nanophytoplankton blooms along the Qinhuangdao Coast

CAO Xihua1, YU Zhiming1, WU Zaixing1, CHENG Fangjin1, HE Liyan1, YUAN Yongquan1, SONG Xiuxian1, ZHANG Jianle2, ZHANG Yongfeng2, ZHANG Wanlei2
1 Key Laboratory of Marine Ecology and Environmental Sciences, Institute of Oceanology, Chinese Academy of Sciences, Qingdao 266071, China;
2 Qinhuangdao Marine Environmental Monitoring Central Station, State Oceanic Administration(SOA), Qinhuangdao 066002, China
Blooms of some pico/nanophytoplankton have occurred frequently along the Qinhuangdao coast since 2009, and it is necessary to identify the critical environmental factors inducing them. In this study, variations in the physical and nutrient characteristics of the seawater were analyzed following the development of local blooms in 2013. The local environmental characteristics were also compared with those of the Changjiang River estuary, China, and the Long Island estuaries in the USA, which are also prone to blooms of special algal species. In Qinhuangdao the local water temperature varied seasonally and rose above 15℃ in 2013 early summer, coincident with the water discoloration. The salinity was more than 28 with a variation range of <3 throughout the year. Our results suggest that the physical conditions of the Qinhuangdao coastal area were suitable for the explosive proliferation of certain pico/nanophytoplankton, e.g. Aureococcus anophagefferens. The water supporting the bloom was not in a condition of serious eutrophication, but there were relatively high concentrations of reduced nitrogen (especially ammonium), which acted as an important nitrogen source for the pico/nanophytoplankton bloom. There was also a large gap between total nitrogen (TN) and dissolved inorganic nitrogen (DIN). Although the phosphate concentration was relatively low, there was no evidence of phosphorus limitation to the growth of pico/nanophytoplankton during bloom events.
Key words:    pico/nanophytoplankton|harmful algae blooms|eutrophication|physical conditions|Qinhuangdao coastal area   
Received: 2015-09-06   Revised:
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