부산항에서 월별 영양염과 엽록소 a와 식물플랑크톤 군집의 월별 변동

Abstract

The global movement of ballast water by ships appears to be the largest single vector for non-indigenous species(bacteria, phytoplankton and zooplankton) transfers (Ruiz et al., 1997). The ballast water of most container ships is stored in ballast tanks and is used to trim and stabilise the vessel (Zhang and Dickman, 1999). Recently, size and speed of ships have increased due to developments of industry, resulting in increased frequency and volume of ballast water discharge. In this study, we conducted the series of nutrient manipulation bioassays to assess the relationship of increased inorganic nutrient concentration and phytoplankton community structure and function. The red tide species (S. costastum, P. sulcata and Ch. socialis) were affected by nutrients (p<0.01) such as nitrite and phosphate. And toxic species showed no relationship on physico-chemical factors (p>0.05), because of low frequency at all seasons and areas. But toxic species appeared to be higher frequency in summer season at all ports, which were affected by temperature and nitrate (p<0.01).