In this study, changes in the microbial ecosystem of the Yeongheungdo island coastal waters were investigated for five years to collect basic data. To evaluate the influence of distance from the coast on the microbial ecosystem, four sites, coastal Site (S1) and 0.75, 1.5, and 3 km away from the coast, were set up and the changes in physicochemical and biological factors were monitored. The results showed seasonal changes in water temperature, dissolved oxygen, salinity, and pH but with no significant differences between sites. For nutrients, the concentration of dissolved inorganic nitrogen increased from 6.4 μM in April-June to 16.4 μM in July-November, while that of phosphorus and silicon phosphate increased from 0.4 μM and 2.5 μM in April-June to 1.1 μM and 12.0 μM in July-November, respectively. Notably, phosphorus phosphate concentrations were lower in 2014-2015 (up to 0.2 μM) compared to 2016-2018 (up to 2.2 μM), indicating phosphorus limitation during this period. However, there were no differences in nutrients with distance from the coast, indicating that there was no effect of distance on nutrients. Phytoplankton (average 511 cells mL-1) showed relatively high biomass (up to 3,370 cells mL-1) in 2014-2015 when phosphorus phosphate was limited. Notably, at that time, the concentration of dissolved organic carbon was not high, with concentrations ranging from 1.1-2.3 mg L-1. However, no significant differences in biological factors were observed between the sites. Although this study revealed that there was no disturbance of the ecosystem, further research and more basic data on the microecosystem are necessary to understand the ecosystem of the Incheon.

1. 서 론
2. 재료 및 방법
    2.1. 현장 샘플링
    2.2. 물리화학적 요인의 분석
    2.3. 박테리아 샘플 보관 및 현존량 분석
    2.4. 종속영양 미소 편모류, 식물플랑크톤, 섬모충류 및동물플랑크톤의 샘플 보관 및 현존량 분석
    2.5. 물리, 화학, 생물학적 요인 간 통계 분석
3. 결 과
    3.1. 조사 정점의 물리, 화학적 요인의 변화
    3.2. 박테리아 및 HNF의 현존량 변화
    3.3. 식물플랑크톤의 현존량 및 조성
    3.4. 섬모충류의 현존량 및 조성
    3.5. 동물플랑크톤의 현존량 및 조성
4. 고 찰
    4.1. 식물플랑크톤 용출 및 박테리아의 소비에 따른용존유기탄소의 변화
    4.2. 모니터링 기간 동안의 생물학적 요인의 변화
    4.3. 팔당댐의 방류량과 Chaetoceros 속의 현존량변화
    4.4. 먹이 섭식에 따른 식물플랑크톤, 섬모충류,동물플랑크톤의 조성 변화
5. 결 론
적 요
사 사

• 김세희(한양대학교 생명과학과) | Sae-Hee Kim (Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 04763, Republic of Korea)
• 김진호(제주대학교 지구해양과학과) | Jin Ho Kim (College of Ocean Sciences, Jeju National University, Jeju 63243, Republic of Korea)
• 강윤호(국립환경과학원 물환경연구부) | Yoon-Ho Kang (Water Environment Research Department, National Institute of Environmental Research, Incheon 22689, Republic of Korea)
• 박범수(한양대학교 생명과학과) | Bum Soo Park (Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 04763, Republic of Korea)
• 한명수(한양대학교 생명과학과) | Myung-Soo Han (Department of Life Science, College of Natural Sciences, Hanyang University, Seoul 04763, Republic of Korea) Corresponding author
• 주재형(국립호남권생물자원관 환경소재연구부) | Jae-Hyoung Joo (Division of Bioresource Utilization, Honam National Institute of Biological Resources, Mokpo 58762, Republic of Korea) Corresponding author