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|Publication Type||Journal Article|
|Year of Publication||1999|
|Authors||Sakami, T.; Nakahara, H.; Chinain, M.; Ishida, Y.|
|Journal Title||J Exp Mar Biol Ecol|
The effects of epiphytic bacteria on the growth of the ciguatera dinoflagellate Gambierdiscus toxicus were examined. Neither of the two G. toxicus strains used in this experiment were able to proliferate in PES medium when the algal cells were in an axenic condition, while proliferation occurred in four of seven bacterial strains examined. Alteromonas sp. strain B4 was the most effective and was found to excrete high molecular weight (> 10 k Da) substances into the medium. The effects of isolated epiphytic bacteria on the growth of G. toxicus were assayed using an algal culture which was contaminated by associated bacteria to maintain the algal growth constant. Most bacteria isolated from the surfaces of red algae Jania spp. with peptone-agar medium did not affect the growth of G. toxicus. One strain, however, Flavobacterium sp. strain C1 clearly inhibited algal growth. Many bacteria were isolated with the utilization of enrichment techniques from Jania spp. where G. toxicus abundantly occurs. The bacterial flora on Jania spp. differed between samples in both number and colony characteristics and the inhibition of G. toxicus growth.
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