남해안에서 고밀도 코클로디니움 적조가 발생하는 메커니즘 비교 연구

Abstract

Harmful Cochlodinium polykrikoides blooms have occurred and caused large damages to the fishing industry since 1995 in the southern coastal waters of Korea. Many researchers have made efforts to understand the outbreak mechanisms of high density C. polykrikoides blooms. Earlier studies suggested oceanographic and meteorological characteristics as the possible factors of C. polykrikoides blooms, which include water mass stratification, nutrient input through precipitation, solar irradiance, wind, and biological interactions. Most of the previous studies, however, have limitations in that the proposed hypotheses of C. polykrikoides blooms focused only on specific incidences. Therefore, these hypotheses need to be verified in a more rigorous manner. In this study, comparative analysis was conducted to see if such hypotheses can explain outbreaks in different locations for longer time period in a consistent way using meteorologic and oceanographic survey data (1999-2014). The results of the analysis indicate that none of the proposed factors can separately explain C. polykrikoides bloom outbreaks for the whole period. For example, precipitation showed a significant correlation with the outbreak duration in Yeosu for the period 1996-2003 but not for the whole period (1999-2014). Likewise, front formation and wind (direction and speed) could explain incidences in certain area only for some part of the period. These suggest the actual outbreak mechanisms could be complicated with multiple pathways whose switching would depend on the balance of many factors working in sequence rather than at the same time.