환경생물 (Korean Journal of Environmental Biology)

  • 제31권2호
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  • Pages.113-120
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  • 2013
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  • 1226-9999(pISSN)
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  • 2287-7851(eISSN)
한국환경생물학회 (Korean Society of Environmental Biology)
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저출력 초음파가 Microcystis sp. (Cyanobacteria)에 미치는 영향

Effects of Low Powered Ultrasonic Wave Exposure on Microcystis sp. (Cyanobacteria)

  • 박영미 (안동대학교 자연과학대학 생명과학과) ;
  • 권오창 (안동대학교 자연과학대학 생명과학과) ;
  • 박정원 (국립공원연구원) ;
  • 정규영 (안동대학교 자연과학대학 생약자원학과) ;
  • 이종은 (안동대학교 자연과학대학 생명과학과) ;
  • 서을원 (안동대학교 자연과학대학 생명과학과)
  • Park, Young Mi (Department of Biological Science, Andong National University) ;
  • Kwon, O Chang (Department of Biological Science, Andong National University) ;
  • Park, Jung Won (National Park Research Institute) ;
  • Chung, Gyu Young (Department of Medicinal Plant Resource, Andong National University) ;
  • Lee, Jong Eun (Department of Biological Science, Andong National University) ;
  • Seo, Eul Won (Department of Biological Science, Andong National University)
  • 투고 : 2012.12.03
  • 심사 : 2013.05.29
  • 발행 : 2013.06.30
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초록

본 연구는 초음파의 주파수별 노출 시간이 녹조현상을 일으키는 Microcystis sp.의 군체에 미치는 영향을 알아보고자 하였다. 각 조사 지점 내의 녹조 생물은 남조강(Cyanophyceae)인 Microcystis sp.가 전체 조류의 약 99.5%를 차지하였다. 초음파의 노출에 따른 녹조류의 chlorophyll-a 농도를 분석해보면 노출시간이 길어짐에 따라 점차적으로 감소하였으며, 특히 70 kHz의 주파수 영역에서 녹조 생물이 세포분열을 통한 생물량의 증가를 억제하는 데 효과적인 것으로 조사되었다. 초음파에 노출되기 전 Microcystis sp.는 단세포가 점액성 물질에 조밀하게 쌓여 있는 군체의 형태로 관찰되었으나 70 kHz 초음파에 노출된 후 Microcystis sp.의 군체의 결속이 약화되고 세포가 군체에서 떨어져 나가는 것으로 나타났다. 또한 초음파는 동 식물성 플랑크톤의 형태적 변화와 운동성에 영향을 미치지 않아 다른 수중 미생물에는 부정적인 영향을 주지 않는 것으로 확인되었다. 따라서 초음파는 Microcystis sp.의 군체와 형태적 변화를 유발하고 세포를 파괴시켜 녹조현상을 일으키는 조류의 생물량을 감소시키는 데 효과적으로 작용할 것으로 사료된다.

This study aimed to investigate the effects of ultrasonic wave on colonial changes of Microcystis sp. causing water-bloom. The effects of frequency change and exposure time of ultrasonic wave on Microcystis sp. were also perceived by measuring the concentration of chlorophyll-a. The concentrations of chlorophyll-a showed a decreasing tendency in all experimental groups exposed to ultrasonic waves, especially the highest decrease at 70 kHz. Before exposed to ultrasonic wave, single cells of Microcystis sp. were observed in a form of colonies which were densely accumulated onto their mucilage layer. However, after one hour exposure to 70 kHz ultrasonic wave, the bonds of colonies were weakened and single cells were separated from the colonies. Moreover, the single cells of the colony were destroyed with the 5 hour exposure time at 70 kHz. As a result, we proposed that the frequency strength and the exposure time of ultrasonic wave might have effects in decrease of biomass of blue-green algae by reducing the concentration of chlorophyll-a, thereby changing and destroying forms of Microcystis sp. colonies.

키워드

참고문헌

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