새 논 문

본 연구팀이 Ocean Science Journal (Springer)에 제출한 논문(아래)이 2011년 6월 30일자로 출판되었습니다.

본 논문은 장염을 일으키는 비브리오 세균과 적조생물의 상호관계를 밝힌 논문입니다. 비브리오 세균은 적조생물의 먹이가 되기도 하고, 적조생물을 사멸시키기도 한다는 새로운 사실을 밝혔습니다. 특히 비브리오 세균은 유해성 적조생물인 Cochlodinium polykrikoides를 잘 사멸시키는 것으로 나타났습니다. 본 논문이 나오기까지 도움을 주신 분들께 진심으로 감사드립니다.

Interactions Between the Pathogenic Bacterium Vibrio parahaemolyticus and Red-tide Dinoflagellates

Kyeong Ah Seong^1*, Hae Jin Jeong²

Abstract − Vibrio parahaemolyticus is a common pathogenic bacterium in marine and estuarine waters. To investigate interactions between V. parahaemolyticus and co-occurring red-tide dinoflagellates, we monitored the daily abundance of  5 common red tide dinoflagellates in laboratory culture; Amphidinium carterae, Cochlodinium ploykrikoides, Gymnodinium impudicum, Prorocentrum micans, and P. minimum. Additionally, we measured the ingestion rate of each dinoflagellate on V. parahaemolyticus as a function of prey concentration. Each of the dinoflagellates responded differently to the abundance of V. parahaemolyticus. The abundances of A. carterae and P. micans were not considerably lowered by V. parahaemolyticus, whereas that of C. polykrikodes was lowered significantly. The harmful effect depended on bacterial concentration and incubation time. Most C. polykrikoides cells died after 1 hour incubation when the V. parahaemolyticus concentration was 1.4x10⁷ cells ml^-1, while cells died after 2 days of incubation when the bacterial concentration was 1.5x10⁶ cells ml^-1. With increasing V. parahaemolyticus concentration, ingestion rates of P. micans, P. minimum, and A. carterae on the prey increased, whereas that on C. polykrikoides decreased. The maximum or highest ingestion rates of P. micans, P. minimum, and A. carterae on V. parahaemolyticus were 55, 5, and 2 cells alga^-1 h^-1, respectively. The results of the present study suggest that V. parahaemolyticus can be both the predator and prey for some red tide dinoflagellates in laboratory culture.