새 논 문

본 연구팀이 Harmful Algae(IF = 2.46)에 제출한 논문(아래)이 2008년 4월호에 출판되었습니다. 

본 논문은 유해성 적조생물인 코클로디니움(Cochlodinium polykrikoides)가 일으키는 적조를 천적인 Strombidinopsis jeokjo (스트롬비디놉시스, 섬모충)를 투입하여 제어할 가능성이 있음을 보여주는 논문입니다. 코클로디니움은 해마다 여름-가을에 발생하며, 1995년 720억원의 어민 피해를 끼쳐 온 이래 올해에도 110억원의 피해를 발생시킨 바 있습니다. 최근에는 일본, 중국, 필리핀, 말레이시아, 캐나다, 미국 등에서도 코클로디니움 적조가 발견되는 등 국제적 관심을 끌고 있는 적조생물입니다.

본 연구에서는 천적인 스트롬비디놉시스가 메조코즘 안에 있던 코클로디니움을 2일 안에 거의 모두 제거하는 것을 보여주었습니다. 앞으로 이 천적을 대량배양한 후 육상양식장이나 해상가두리 근방에 투입하여 코클로디니움 적조를 제어하도록 할 예정입니다.

본 논문이 나올때까지 많은 도움을 주신 여러분들께 진심으로 감사드립니다.

Hae Jin Jeong, Jae Seong Kim, Yeong Du Yoo, Seong Taek Kim, Jae Yoon Song, Tae Hoon Kim, Kyeong Ah Seong, Nam Seon Kang, Mi Seon Kim, Jong Hyeok Kim, Shin Kim, Jina Ryu, Hee Mahn Lee, Won Ho Yih (2008) Control of the harmful alga Cochlodinium polykrikoides by the naked ciliate Strombidinopsis jeokjo in mesocosm enclosures. Harmful Algae. 7:368-377

Control of the harmful alga Cochlodinium polykrikoides by the naked ciliate Strombidinopsis jeokjo in mesocosm enclosures

Hae Jin Jeong^a,*, Jae Seong Kim^a, Yeong Du Yoo^a, Seong Taek Kim^b, Jae Yoon Song^b, Tae Hoon Kim^b, Kyeong Ah Seong^b, Nam Seon Kang^a, Mi Seon Kim^b, Jong Hyeok Kim^b, Shin Kim^c, Hee Mahn Lee^b, Won Ho Yih^b

^aSchool of Earth and Environmental Sciences, College of Natural Sciences, Seoul National University, Seoul 151-747, Republic of Korea

^bDepartment of Oceanography, College of Ocean Science and Technology, Kunsan National University, Kunsan 573-701, Republic of Korea,

^cMarineBio Co., Myrongdong San 68, Kunsan 573-701, Republic of Korea

Abstract. Red tides dominated by the harmful dinoflagellate Cochlodinium polykrikoides have caused annual losses of USD $5-60 million to the Korean aquaculture industry since 1995 and a loss of USD $3 million during a 1999 net-pen fish mortality event in Canada. In order to evaluate the potential to control C. polykrikoides red tides using mass-cultured heterotrophic protistan grazers, we monitored the abundance of Strombidinopsis jeokjo (a naked ciliate) and C. polykrikoides after mass-cultured S. jeokjo was introduced into mesocosms (ca. 60 l) deployed in situ and containing natural red tide waters dominated by C. polykrikoides. Water temperature, salinity, and pH, as well as the abundance of other co-occurring protists and metazooplankton were measured concurrently. To compare the growth and ingestion rates of S. jeokjo feeding on cultured versus natural populations of C. polykrikoides, we also monitored the abundance of cultured C. polykrikoides and S. jeokjo in bottles during laboratory grazing experiments. S. jeokjo introduced into the mesocosms grew well, effectively reducing natural populations of C. polykrikoides from about 1000 cells ml^-1 to below 10 cells ml^-1 within 2d. The growth and ingestion rates of cultured S. jeokjo on natural populations of C. polykrikoides in the mesocosms for the first 30 h (0.72 d^-1 and 51 ng C grazer^-1 d^-1) were 84% and 44%, respectively, of those measured in the laboratory during bottle incubations with similar initial prey concentrations. The calculated grazing impact of S. jeokjo on natural populations of C. polykrikoides suggests that large-scale cultures of this ciliate could be used for controlling C. polykrikoides red tides in small areas. 

Keywords: Growth, harmful algal bloom, ingestion, management, mitigation, red tide