황해 부유생태계에 미치는 태풍의 잠재적 영향

Abstract

The response of planktonic ecosystem to Typhoon passage was assessed in the Yellow Sea in summer during four years (2010-2013). In-situ surveys were carried out to investigate the water column properties and spatial distribution of mesozooplankton population at the fixed station in the summer, when the water column was strongly stratified. Only year 2011, one of the strongest typhoons, named ‘MUIFA’, directly passed through the study site just before the in-situ survey. The spatial distributions of nutrient, chlorophyll-a (chl-a), and mesozooplankton community were compared between the year(s) with and without the typhoon passage. Typically, the water column was strongly stratified (more than 10 ℃) in thesummer of the years without the typhoon, whereas in the year 2011, the vertical stratification became weakened after the typhoon passage. Due to the vertical mixing of the water column, nutrient concentrations (nitrate, phosphate, and silicate) of the subsurface waters were higher in the year 2011 than other years, leading to increment of chl-a and standing crops of phytoplankton. Vertical distributional pattern of female adults and copepodites (CIV and CV) of Calanus sinicus was clearly different between the years with vs. without the typhoon passage although the difference of C. sinicus abundance was not clear. Large abundance of female adults and copepodite (CV) at surface waters in the year 2011 could be relankton population at the fixed station in the summer, when the water column was strongly stratified. Only year 2011, one of the strongest typhoons, named ‘MUIFA’, directly passed through the study site just before the in-situ survey. The spatial distributions of nutrient, chlorophyll-a (chl-a), and mesozooplankton community were compared between the year(s) with and without the typhoon passage. Typically, the water column was strongly stratified (more than 10 ℃) in thesummer of the years without the typhoon, whereas in the year 2011, the vertical stratification became weakened after the typhoon passage. Due to the vertical mixing of the water column, nutrient concentrations (nitrate, phosphate, and silicate) of the subsurface waters were higher in the year 2011 than other years, leading to increment of chl-a and standing crops of phytoplankton. Vertical distributional pattern of female adults and copepodites (CIV and CV) of Calanus sinicus was clearly different between the years with vs. without the typhoon passage although the difference of C. sinicus abundance was not clear. Large abundance of female adults and copepodite (CV) at surface waters in the year 2011 could be re