EFFECT OF SKELETONEMA-COSTATUM (GREV) CLEVE ON THE GROWTH OF MARINE-BACTERIA

The effect of Skeletonema costatum (Grev.) Cleve on bacterial growth was investigated in mixed culture. Twenty marine bacterial strains of four genera were tested. Generally, the growth of Pseudomonas and Vibrio was inhibited by the alga. Conversely, the growth of Flavobacterium was apparently stimulated. A clear tendency was not obtained for Acinetobacter. The inhibitory action of Skeletonema costatum was strongest during the exponential growth phase under 3,000 lux illumination. Further enrichment with nitrogen and phosphorus sources and glucose as a carbon source had no influence on the action, but yeast extract counteracted it. Only slight suppression of bacterial growth was shown by an algal culture filtrate. © 1979.