Journal of Tropical Oceanography ›› 2020, Vol. 39 ›› Issue (2): 88-97.doi: 10.11978/2019027CSTR: 32234.14.2019027

• Marine Biology • Previous Articles     Next Articles

Variation characteristics of the evolution of Karenia mikimotoi bloom and environmental factors based on online monitoring buoy data*

Congjiao ZHAO1(), Xizhen LIU1, Shengjing FU2, Weimin YAO2, Yan ZHOU1,4(), Jun MA3   

  1. 1. Marine Monitoring & Forecasting Center of Zhejiang Province, Hangzhou 310007, China;
    2. Marine Monitoring Center of Wenzhou, Wenzhou 325011, China
    3. Marine Monitoring Center of Taizhou, Taizhou 318000, China
    4. Zhejiang Province Academy of Marine Sciences, Hangzhou 310012, China
  • Received:2019-03-12 Revised:2019-10-15 Online:2020-03-10 Published:2020-03-10
  • Supported by:
    Foundation item: Key Laboratory of Integrated Monitoring and Applied Technology for Marine Harmful Algal Blooms, S.O.A.(MATHAB201709);Public Science and Technology Research Funds Projects of Ocean(201305012)

Abstract:

Superior to traditional monitoring methods, the marine monitoring buoys are able to obtain long-term and real-time continuous marine environmental data to reflect the dynamic changes in marine environmental conditions. In order to clarify the occurrence and development of the red tide of Karenia mikimotoi, and to carry out integrated monitoring and early warning of red tide disasters, we analyzed the evolution of Karenia mikimotoi bloom and environmental factors based on online monitoring buoy data obtained from the coastal area of Nanji Island of Zhejiang Province in June 2017. K. mikimotoi bloom occurs in the sea water with temperature and salinity ranging from 22.8℃ to 26.0℃ and from 28.8 to 31.8, and when the air temperature is between 20.4℃ and 27.3℃, which are suitable for the cell growth of K. mikimotoi. Higher light intensity can support higher K. mikimotoi cell density. Pearson correlation analysis shows that the cell density of K. mikimotoi is significantly positively correlated with chlorophyll a (chl-a). Dissolved oxygen (DO), dissolved oxygen saturation (DO%), pH, water temperature, and air temperature are all significantly positively correlated with chl-a. Salinity is significantly negatively correlated with chl-a. Wind blowing ocean current may facilitate the accumulation of algae to the shore, which creates suitable conditions for the outbreak of red tides. During the red tide, chl-a, DO% and pH have synergistic changes, which may carry out red tide early-warning signs based on the online monitoring buoy data.

Key words: Karenia mikimotoi, red tide evolution, marine water quality monitoring buoy, meteorological data

CLC Number: 

  • P762.33