Carbon biomass of plankton community, Total Organic Carbon (TOC) and Chlorophyll a (chl.a) concentration were examined in the SeoNakdong river from January to December in 2014, to assess composition of phyto- and zoo-plankton variation, to certify the correlation between chl.a and TOC and to determine the level of contribution of plankton carbon content to TOC in the reservoir-river ecosystem. The correlation level between TOC and chl.a was low in the year 2014 but exceptionally was highly correlated only during the period with cyanobacterial bloom. The high level of contribution of plankton carbon content to TOC was attributed to cyanobacterial carbon biomass from May to November and to Cladocera carbon biomass from March to May, November and December despite of its low abundance. These results suggest that there were inter-relationships between phytoplankton, zooplankton and TOC and also subtle consistency of their properties through the year. These patterns should be discussed in relation to the physiochemical and biological characteristics of the environment, as well as to allochthonous organic matters from non-point pollution sources.

Abstract
1. 서 론
2. 재료 및 방법
    2.1. 연구대상 지역
    2.2. 물리화학적 환경요인
    2.3. 동․식물플랑크톤 종 조성 및 탄소 생물량
3. 결과 및 고찰
    3.1. 물리화학적 환경 요인
    3.2. 동·식물플랑크톤 종 조성 및 군집 변화
    3.3. TOC, chl.a 농도와 플랑크톤 탄소 생물량의 상관성
4. 결 론
REFERENCES

• 이유정(부산광역시보건환경연구원) | You-Jung Lee (Busan Metropolitan City Institute of Health and Environment(BIHE)) Corresponding author