Korean Journal of Ecology and Environment (생태와환경)

The Korean Society of Limnology (한국수생태학회)
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Seasonal Variations of Cyanobacterial Toxins (microcystins) in Yeongchun Reservoir

영천호에서 남조류 독소(microcystins)의 계절적 변동

  • Published : 2008.06.30
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Abstract

Seasonal variations of cyanobacterial toxins (microcystins) in Yeongehun reservoir were studied from March to December, 2007. High level of microcystins production was shown during the late autumn and winter seasons. Total microcystins concentration increased sharply when the dominant species changed from Anabaena sp. to Microcystis aeruginosa. Microcystins-RR and -YR were the main components of the microcystins, whereas microcystin-LR was detected in small quantities. Especially, large amounts of microcystin-LR were detected when standing crops of M. aeruginosa increased exponentially. Total microcystins concentration showed a negative correlation with water temperature. However, total microcystins were lowly correlated with other environmental factors except for water temperature. As a result, this study clearly demonstrated that M. aeruginosa was the main producer of microcystins in Yeongchun reservoir.

영천호를 대상으로 2007년 3월부터 12월까지 남조류 발생현황, 환경요인, 남조류 독소인 microcystins의 생성 농도를 조사 분석하였다. HPLC 분석방법으로 영천호의 계절별 microcystins 농도를 분석한 결과, 각 요인에 따라 뚜렷한 증감패턴을 나타냈다. 계절적 인 우점종이 Anabaena sp.에서 M. aeruginosa로 바뀌면서 microcystins 생성량이 현저하게 증가하는 현상이 관찰되었고, 주요 출현종 중 M. aeruginosa 밀도와 microcystins 농도 간의 상관성이 가장 높은 것으로 나타났으며, M. aeruginosa 균주들의 높은 독소 생성율을 고려할 때, M. aeruginosa가 남조류 독소인 microcystins 생성에 가장 기여도가 높은 것으로 확인되었다. Microcystins와 환경요인들 간의 상관성 분석결과, 조사된 6개 항목(수온, pH, 전도도, 총인, 총질소, 용존 규소) 중 수온과는 약 $20^{\circ}C$ 이상의 수온범위에서 역의 상관성이 있는 것으로 확인되었다.

Keywords

References

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