播磨灘における植物プランクトン, 細菌, 海水水質の相互関係

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The interrelations among phytoplankton, bacteria and properties of seawater were investigated in the Sea of Harima. Symbiotic relationships between Chattonella antiqua and bacteria were also studied by cultivation in the seawater sampled.The following results were obtained.1) Inflow of fresh water and photosynthesis by phytoplankton were primary factors in changes in the properties of seawater. Bacteria could be classified into two groups : one correlated to the inflow of fresh water; the other, which required glycolate, to the concentration of chlorophyl-a.2) Observation of diurnal changes in the growth of phytoplankton and bacteria revealed that the growth of bacteria was reterded by several hours from the maximum activity of photosynthesis of phytoplankton.3) C. antiqua could not grow without vitamin B_<12> in the seawater medium, even if it contained sufficient inorganic nutrients. In the presence of bacteria, however, C. antiqua grew well without vitamins.4) Although C. antiqua grew well in symbiosis with bacteria in the seawater, its growth was inhibited by the presence of other phytoplankton.
1984-07-25