Korean Journal of Environmental Biology Vol. 40 No. 1 (p.112-123)

2014년 부산 연안 해역에서 계절적 환경특성에 따른 식물플랑크톤 군집의 변화양상

Seasonal changes in phytoplankton community related with environmental factors in the Busan coastal region in 2014
키워드 :
river discharge,Nakdong river,Tsushima Warm Current (TWC),phytoplankton community,nutrients


서 론
재료 및 방법
   1. 현장조사
   2. 시료분석
   3. 기상자료 및 통계분석
결 과
   1. 환경요인의 변화
   2. 식물플랑크톤 군집구조 및 Chl. a 농도 변화
고 찰
   1. 환경인자특성
   2. 식물플랑크톤과 Chl. a 농도의 계절적 분포특성
   3. 주성분 분석에 의한 부산 연안 해역 해석
적 요
사 사


To assess the influence of environmental factors on the phytoplankton community structure and total phytoplankton biomass during four seasons in 2014, we investigated the abiotic and biotic factors at 25 stations in the Busan coastal region. The phytoplankton community and total phytoplankton biomass were strongly dependent on the discharge from the Nakdong River, and the high density of phytoplankton was related with the introduction of the Tsushima Warm Current (TWC), particularly in the thermohaline fronts of the fall season. The relationship between the salinity and nutrient (Dissolved inorganic nitrogen=DIN: R 2=0.72, p<0.001 and Dissolved inorganic silicon=DSi: R 2=0.78, p<0.001) highly correlated with the river discharge, implying that those nutrients have played a crucial role in the growth of diatom and cryptophyta. The total phytoplankton biomass was highest in the summer followed by autumn, spring, and winter. Diatom and cryptophyta species were dominant species during the four seasons. Additionally, there were strong positive correlations between Chlorophyll a and total phytoplankton biomass (R 2=0.84, p<0.001), cryptophyta (R 2=0.76, p<0.001) and diatom (R 2=0.50, p<0.001), respectively. In particular, we found that there were significant differences in the nutrients, phytoplankton community compositions, and total phytoplankton biomass between the inner and the outer coastal region of Busan, depending on the amount of river discharge from the Nakdong River, particularly during rainy seasons. Therefore, the seasonal change of TWC and river discharge from the Nakdong River serve an important role in determining phytoplankton population dynamics in the Busan coastal region.