Akashiwo sanguinea 발생에 따른 부유성 박테리아와 부착성 박테리아의 변화 및 환경특성 파악

Abstract

To investigate changes in environmental factors and bacteria community during Akashiwo sanguinea blooms, we conducted daily monitoring for 41 days (Nov. 14, 2016 &#8211 Feb. 27, 2017), in Jangmok Bay, a semi-closed bay on the southern coast of South Korea. A. sanguinea was first observed on Oct. 31, 2016, and up to 2,935 cells mL-1 appeared on Nov.18, 2016, and A. sanguinea cell disappeared on Jan. 30, 2017. The mean temperature and salinity were 14.4℃ and 32.2 at the occurrence of A. sanguinea blooms, respectively. Dissolved inorganic phosphorus and dissolved inorganic nitrogen increased during the blooming period, while dissolved silica was not changed. Dissolved organic carbon was similar pattern to that of A. sanguinea and showed a maximum of 7.56 mg L-1. The time-lag changes in bacteria abundances might be associated with fluctuation in A. sanguinea blooms. A free living bacterium, Rickettsia rhipicephali (α-proteobacteria) was strongly and positively associated with A. sanguinea blooms. All attached bacteria cannot find positive correlation with A. sanguinea blooms. The increase in this bacterium is presumably due to the use of inorganic nutrients from the DOM from A. sanguinea. In contrast, Flaviramulus ichthyoeuteri (Bacteriodetes) and Leutibacter algarum (α-proteobacteria) in attached bacteria were negatively related with dinoflagellate blooms. In this study, specific responses of free living and attachet of South Korea. A. sanguinea was first observed on Oct. 31, 2016, and up to 2,935 cells mL-1 appeared on Nov.18, 2016, and A. sanguinea cell disappeared on Jan. 30, 2017. The mean temperature and salinity were 14.4℃ and 32.2 at the occurrence of A. sanguinea blooms, respectively. Dissolved inorganic phosphorus and dissolved inorganic nitrogen increased during the blooming period, while dissolved silica was not changed. Dissolved organic carbon was similar pattern to that of A. sanguinea and showed a maximum of 7.56 mg L-1. The time-lag changes in bacteria abundances might be associated with fluctuation in A. sanguinea blooms. A free living bacterium, Rickettsia rhipicephali (α-proteobacteria) was strongly and positively associated with A. sanguinea blooms. All attached bacteria cannot find positive correlation with A. sanguinea blooms. The increase in this bacterium is presumably due to the use of inorganic nutrients from the DOM from A. sanguinea. In contrast, Flaviramulus ichthyoeuteri (Bacteriodetes) and Leutibacter algarum (α-proteobacteria) in attached bacteria were negatively related with dinoflagellate blooms. In this study, specific responses of free living and attache