Stable isotope tracers were first applied to evaluate the Microcystis cell assimilation efficiency of bivalves, since the past identification method has been limited to tracking the changes of each chl-a, clearity, and nutrient. The filter-feeders (Sinanodonta woodiana and Unio douglasiae) were assessed under the condition of cyanobacteria (Microcystis aeruginosa) blooms through an in mesocosm experiment using 13C and 15N dual isotope tracers. Chl-a concentration in the treatment mesocosm was dramatically decreased after the beginning of the second day, ranging from 116 to 66 μg L−1. In addition, the incorporated 13C and 15N atom % in the S. woodiana bivalve showed higher values than U. douglasiae bivalves. The results demonstrate that U. douglasiae has less capacity to assimilate toxic cyanobacteria derived from diet. Our results therefore also indicate that S. woodiana can eliminate the toxin more rapidly than U. douglasiae, having a larger detoxification capacity.

Abstract
 서 론
 재료 및 방 법
  1. 조사지점
  2. 안정동위원소 추적자 (13C, 15N)을 이용한 메소코즘현장실험
  3. 수질조사 분석항목 및 방법
  4. 식물플랑크톤 정성 및 정량 분석
  5. 탄소, 질소 함량 및 안정동위원소비 분석
 결 과
  1. 환경변화
  2. 식물플랑크톤 생물량의 변화
  3. 입자태 유기물 및 이매패류의 안정동위원소비 변화
 고 찰
  1. 이매패류의 남조류 섭식율 변화
  2. 이매패류를 이용한 수질개선효과
 적 요
 REFERENCES

• 서연지(한국해양과학기술원 대양자원연구센터) | Seo Yeon-Ji (Global Ocean Research Center, Korea Institute of Ocean Science and Technology)
• 김민섭(국립환경과학원 환경측정분석센터) | Min-Seob Kim (Environmental Research Complex) Corresponding author