Verification of prolonged toxicity of tributyltin chloride toward marine bacteria in sediments of busy ports

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Tributyltin chloride(TBTCl) has still been existed in sediments by adsorption to minerals. We isolated 10 species of TBT-tolerant marine bacteria from busy pots of Japan. Photobacterium sp. TKY1, which was isolated from quarantine anchorage in Tokyo Bay, showed the most tolerant ability toward TBTCl. The isolate survived even when the number of 10^<12. 8> molecules of TBT^+ was associated with a single cell. Changes in the number of surviving cells of TBT-sensitive Vibrio sp. was examined in the presence of the isolate when 100μM of TBTCl was existed. Two order reduction of the number of surviving cells of Vibrio sp. was observed in comparison with that in the absence of the isolate, indicating that the TBT-tolerant marine bacteria might have contributed to the disruption of marine microbial diversity through accumulation of TBT^+ onto cell surface.