저수온기, 동해연안의 식물플랑크톤 군집 조사

Abstract

Nano and picoplankton (<20 ㎛) account for more than 50% of primary product in an ocean. In Korea, the biomass of <20 and >20 ㎛ plankton were investigated at the East sea because the ‘East sea’ has similar characteristics of ocean. Especially, the biomass of <20 ㎛ plankton was over 50% for primary product in low temperature period. Thus, this study investigated phytoplankton composition in low temperature period. The sampling was conducted at 10 sites which locate between Sokcho Bay and Ulsan Bay 2 times during Mar. 2012. We divided phytoplankton by size, <20 and >20 ㎛ plankton, and <20 ㎛ phytoplankton divided by type, F(filament), O(oval), OF(oval & flagella), R(rod), S(spherical) type. Water temperature were ranged from 8.24∼13.05 ℃, salinity were ranged from 26.25∼35.35 PSU during sampling periods. The phytoplankton abundances were 1.94×105∼4.36×106 cells L-1 and the biomass of <20 ㎛ plankton were over 80% of primary products and it were observed at least 20 species. Diatom was most dominant for>20 ㎛ plankton and S type was most dominant for <20 ㎛ plankton. From this study, we could know the importance of the <20 ㎛ plankton for the primary products and bio-diversity. We suggest it’ll be needed for the identification and ecological study for them.specially, the biomass of <20 ㎛ plankton was over 50% for primary product in low temperature period. Thus, this study investigated phytoplankton composition in low temperature period. The sampling was conducted at 10 sites which locate between Sokcho Bay and Ulsan Bay 2 times during Mar. 2012. We divided phytoplankton by size, <20 and >20 ㎛ plankton, and <20 ㎛ phytoplankton divided by type, F(filament), O(oval), OF(oval & flagella), R(rod), S(spherical) type. Water temperature were ranged from 8.24∼13.05 ℃, salinity were ranged from 26.25∼35.35 PSU during sampling periods. The phytoplankton abundances were 1.94×105∼4.36×106 cells L-1 and the biomass of <20