Doam Bay is an estuary where harmful algal blooms (HABs) such as red tides develop frequently in summer. The bay also is influenced by freshwater inflow from Tamjin River in upper regions as well as from an artificial lake in lower regions. Phytoplankton size and species composition were investigated at six stations located in the lower regions in April, June and July, 2007. Physical properties (temperature, salinity and SS) were intensively measured for 3 days (5 occasions) after the freshwater discharges from the dike. The freshwater discharge affected temperature, salinity and turbidity in the study sites adjacent to the freshwater lake. Phytoplankton biomass was larger in April than June and it increased more in July. An explicit shift of species composition was observed. Diatoms were dominant in April and June (>70%) whereas their abundances greatly decreased and chlorophytes increased in July. Pseudo-nitzschia sp. was dominant at all stations (except St. 2) and this change was also detected in ecological indices such as diversity and dominance index.

Abstract
 1. 서 론
 2. 재료 및 방법
  2.1 현장 조사
  2.2 분석방법
 3. 결과
  3.1 물리환경 변화
  3.2 식물플랑크톤 변동: 크기구조와 종조성
  3.3 생태지수, 상관성 분석
 4. 고찰
 참고문헌

• 양응렬(목포해양대학교 환경 · 생명공학과) | Eeng-Ryul Yang (Department of Environmental Engineering & Biotechnology, Mokpo National Maritime University)
• 정병관(목포해양대학교 환경 · 생명공학과) | Byung-Kwan Jeong (Department of Environmental Engineering & Biotechnology, Mokpo National Maritime University)
• 이어진(목포해양대학교 환경 · 생명공학과) | Eo-Jin Lee (Department of Environmental Engineering & Biotechnology, Mokpo National Maritime University)
• 신용식(목포해양대학교 환경 · 생명공학과) | Yong-Sik Shin (Department of Environmental Engineering & Biotechnology, Mokpo National Maritime University) Corresponding author
• 류동기(군산대학교 해양과학대학 해양생명과학과) | Dong-Ki Ryu (Department of Aquaculture & Aquatic Science, College of Ocean Science & Technology, Kunsan National University)