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

Journal of Oceanology and Limnology 2018年第2期36卷 281-292页

作者：曹西华俞志明吴在兴程芳晋贺立燕袁涌铨宋秀贤张建乐张永丰张万磊 Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences Qinhuangdao Marine Environmental Monitoring Central Station State Oceanic Administration (SOA)

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°C in 2013 early summer, coincident with the water discoloration. The salinity was more than 28 with a variation range of pico/nanophytoplankton, e.g. Aureococcus anophageff erens. 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.

关键词： pico/nanophytoplankton harmful algae blooms eutrophication physical conditions Qinhuangdao coastal area

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