Abstract

Bacterial attachment to phytoplankton cells was investigated in natural sea water and with a mixed culture of Flavobacterium T-8D and marine diatom, Skeletonema costatum (Grev.) Cleve. The attached bacteria on incubated natural phytoplankton cells were considerably different from those in the surrounding sea water. The attachment rate of T-8D to the alga depended on the algal growth phase and light, but not on the bacterial concentration. The attachment of this strain to glass surfaces depended on the bacterial concentration. The results indicate that characteristic bacterial groups will attach to phytoplankton cells depending on the physiological condition of the algae, but not on the concentration of bacteria or dissolved organic matter.

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