Study Of The Character Of Distribution Of Synechococcus In The East China Sea And The Yellow Sea

1. The abundance, biomass and character of distribution of Synechococcus in the East China Sea and the Yellow Sea were investigated as well as the contribution of Synechococcus to the total planktonic biomass in two seasons, autumn (Oct--Nov, 2000) and spring (Mar--Apr, 2001). In autumn, the abundance and biomass of Synechococcus were 1.72×10~4cell/ml and 5.07(gC/L respectively and in spring these two value were 4.83×10~4cell/ml and 7.25(gC/L respectively. Both of the abundance and the biomass of Synechococcus were higher in spring than in autumn and higher in the East China Sea than in the Yellow Sea. The contributions of Synechococcus to the total planktonic biomass in the two seasons were familiar with 43.9% in Autumn and 43.4% in Spring. Both of the biomass of Synechococcus and the contribution of Syenchococcus to the total planktonic biomass presented a clear vertical distribution tendency, surface>middle>bottom, except the contribution of Syenchococcus to the total planktonic biomass in autumn which had the maximum in the bottom. The abundance, biomass and character of distribution of Synechococcus in the Yellow Sea were investigated as well as the contribution of Synechococcus to the total planktonic biomass from Oct. 2000 to Jun. 2001. The abundance and biomass of Synechococcus reached their minimums ( 1.19×10~4cell/ml and 3.49(gC/L, respectively) from Oct. 2000 to Dec. 2000. From Dec. 2000 to Apr. 2001, the abundance and biomass of Synechoccus increased sharply to2. 4.68×10~4cell/ml and 7.02(gC/L respectively, and then kept some kind of stable with a little increasing from Apr. to Jun. 2001. In our research, the maximums of the abundance and biomass of Synechococcus (5.25×10~4cell/ml and 7.88(gC/L, respectively) appeared in Jun. 2001. The vertical distribution of the Syenchococcus was well agreed with the temperature. In Apr. 2001, when the temperature was uniform in the water column, the vertical distribution of Syenchococcus appeared a clear tendency of decreasing from surface to the bottom which was correlated with the light. The contribution of Synechococcus to the total planktonic biomass changed from 32.26 to 42.5% in the different voyages. In the same region (near shore) of the sea area investigated, it presented a similar pattern of change with the abundance and biomass of Synechococcus and the maximum and minimum were 27.97% (Oct. 2000) and 38.82% (Jun. 2001) respectively. Also, its vertical distribution had a same pattern as those of the biomass and abundance of Synechococcus, decreasing from surface to bottom.