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Relationship between the bloom of Noctiluca scintillans and environmental factors in the coastal waters of Sagami Bay, Japan
Miyaguchi, H.; Fujiki, T.; Kikuchi, T.; Kuwahara, V.S.; Toda, T. (2006). Relationship between the bloom of Noctiluca scintillans and environmental factors in the coastal waters of Sagami Bay, Japan. J. Plankton Res. 28(3): 313-324
In: Journal of Plankton Research. Oxford University Press: New York,. ISSN 0142-7873, more
Peer reviewed article  

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Keywords
    Algal blooms; Noctiluca scintillans (Macartney) Kofoid & Swezy, 1921 [WoRMS]; INW, Japan, Honshu, Sagami Bay [Marine Regions]; Marine

Authors  Top 
  • Miyaguchi, H.
  • Fujiki, T.
  • Kikuchi, T.
  • Kuwahara, V.S.
  • Toda, T.

Abstract
    In order to study the mechanism of the bloom formation of Noctiluca scintillans, the relationship between the variation in the abundance of N. scintillans and environmental factors was examined in the coastal waters of Sagami Bay, Japan. Hydrographic (temperature, salinity, water stability), biological (chlorophyll a concentration, zooplankton biomass) and meteorological (rainfall, wind velocity, wind direction) factors were investigated from 1997 to 2004. For all years, the abundance of N. scintillans started to increase from March and reached a maximum in spring between April and May. The abundance in 1997 and 2000 was relatively high compared to the other years while the abundance in 1998 and 2004 was relatively low. A stepwise multiple linear regression analysis showed that the wind direction and rainfall were significantly correlated with the variation in the abundance of N. scintillans. Our results suggest that bloom formation can be separated into a three-step process; 1) initial increase in the abundance of N. scintillans attributed to an increase in optimum hydrographic and biological factors, 2) N. scintillans are then accumulated by convergence of seawater by the factors of low rainfall and wind, and 3) swarmer-effects suggested enhance bloom formation. Accumulation is considered to be a key trigger in this process of the formation of large-scale blooms.

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