Effects of Nonylphenol and Diethylhexyl Phthalate on the Population Growth of Freshwater HABs, Microcystis and Stephanodiscus

내분비교란물질이 조류의 성장에 미치는 영향

  • Lee, Ju-Han (Department of Life Science, Hanyang University) ;
  • Kim, Baik-Ho (Department of Life Science, Hanyang University) ;
  • Han, Myung-Soo (Department of Life Science, Hanyang University)
  • Published : 2005.09.30

Abstract

Effects of two endocrine disrupters (EDs) , nonylphenol (NP) and diethylhexyl phthalate (DEHP), on the population growth and morphology of two freshwater HABs (harmful algal blooms) , Microcystis aeruginosa and Stephanodiscus hantzschii, which frequently evoked the hazard bloom in an eutrophic lakes and reservoirs worldwide, were examined with seven different concentrations of EDs (0.01, 0.05, 0.1, 1,2, 2.5 and 3 ppm). Even at concentration below 0.01 ppm, NP strongly inhibited the algal growth of both M. aeruginosa and S. hantzschii, regardless of the algal growth phase. Morphologically, the algal cell treated with NP gradually lost green color in cytoplasm, became smaller in cell size, and then, was hardly seen in microscopic field. On the other hand, DEHP employed did not affect two algae at all concentrations, and rather stimulated the growth by about 10% with a treatment at 3.00 ppm compared to control. These results indicate that the continuous input of EDs, DEHP into the natural water system plays a crucial role to enhance or help an outbreak of algal bloom in eutrophic waters.

내분비계 장애물질이 식물플랑크톤의 개체군 성장에 미치는 영향을 이해하고자 부영양 호수 및 하천에서 우점하는 남조 M. aeruginosa와 규조 S. hantzschii를 성장시기에 따라 자연수 농도의 10 ${\sim}$ l,000배까지 다양한 농도로 투여하고 현존량 및 형태적 변화를 조사하였다. Nonylphenol (NP)을 조류세포 배양초기나 대수성장기에 처리하였을 경우 농도 0.01 ppm이상에서 곧바로 성장억제 현상을 보였으며, 남조 M. aeruginosa가 규조 S. hantzschii보다 더 심한 억제현상을 보였다. 이에 반해 diethyhexyl phthalate(DEHP)의 경우에는 조류세포 성장시기나 처리농도에 상관없이 성장 억제 현상은 관찰되지 않았고, 실험 중 가장 높은 처리농도인 3.00 ppm 처리군에서는 오히려 대조군보다 10% 이상의 높은 성장을 나타냈다. 조류세포의 형태적 변화는 NP를 처리한 모든 실험군에서 조류세포의 색소체 변화가 뚜렷하였으며, M. aeruginosa 세포의 경우, 크기가 점차 작아지는 특징을 보였다. 결국 DEHP의 자연계로의 유출은 식물플랑크톤을 섭식하는 섬모충이나 동물플랑크톤의 성장을 억제하거나 M. aeruginosa 및 S. hantzschii와 같은 유해조류의 성장을 촉진함으로써 부영양수역 조류대발생의 중요한 요인으로 작용될 수 있음을 시사해주고 있다.

Keywords

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