Ecology and Resilient Infrastructure

Korean Society of Ecology and Infrastructure Engineering (응용생태공학회)
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Application Possibility of Naphthoquinone Derivative Nq 4-6 for Mitigation of Winter Diatom Bloom

겨울철 규조류 대발생 제어를 위한 Naphthoquinone 유도체 Nq 4-6의 적용 가능성

  • Received : 2015.08.09
  • Accepted : 2015.08.31
  • Published : 2015.09.30
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Abstract

We conducted the algicidal activity screening tests using 10 L microcosm to investigate the possibility of the field application of naphthoquinone derivative Nq 4-6 compound as an algicide. We determined its application range to assess its algicidal effects on the phytoplankton and to evaluate the response of the planktonic community and the water environment to this chemical. From results of the microcosm experiments, Nq 4-6 compound showed high algicidal activity on the centric diatoms such as Stephanodiscus hantzschii and Cyclotella meneghiniana, but it had no effect on other phytoplankton. The abundance of S. hantzschii continuously increased in the control, but its cell density decreased 1 day after the Nq 4-6 treatment. In particular, Nq 4-6 showed algicidal activity of 94.4% against S. hantzschii 7 days after the treatment. The dominance index of phytoplankton community was lower in the treatment than in the control. The diversity index, richness index and evenness index of phytoplankton community was higher in the treatment. Environmental factors and biological factors did not show specific changes after the Nq 4-6 compound treatment. Therefore, the results of this study demonstrates that Nq 4-6 is an effective agent for the control of S. hantzschii blooms, and that the microcosm tests play a crucial role when assessing field application.

겨울철 한강과 낙동강에서 규조 Stephanodiscus hantzschii에 의한 조류발생이 빈번하게 일어나며, 이로 인한 수자원의 질적변화와 정수과정에 많은 경제적 손실을 주고 있다. 본 연구진은 조류대발생의 원인종인 S. hantzschii을 제어할 수 있는 naphthoquinone (Nq) 화합물을 개발하였다. 본 연구는 개발된 Nq 화합물 중 가장 친환경적인 화합물을 선정하기 위한 실험으로 물질의 살조범위 실험과 낙동강 현장수를 이용한 10 L 규모의 미소생태 실험을 수행하였다. 그 결과 Nq 4-6 화합물의 살조범위는 원반형 규조류에 특이적으로 나타났으며, 남조류 및 녹조류에 대해 살조 활성이 나타나지 않았다. 미소생태 실험 결과, 대조구에서 S. hantzschii가 지속적으로 세포밀도가 증가한 반면, Nq 4-6 화합물을 접종한 처리구에서는 처리 7일째 대조구 대비 S. hantzschii가 94.4% 감소하였으며, S. hantzschii를 제외한 나머지 규조류 및 녹조류에서는 Nq 4-6 화합물 처리 후 살조활성이 관찰되지 않았다. 식물플랑크톤 군집 분석 결과 대조구에 비해 처리구에서 우점도는 낮게 나타났으며, 다양도, 풍부도, 균등도 등은 처리구에서 높게 나타났다. 물리화학적요인 (용존산소, pH, 영양염) 및 미소생물 (heterotrophic nanoflagellates, 섬모충, 박테리아) 등에서도 Nq 4-6 화합물 처리 후 특이적인 변화는 나타나지 않았다. 따라서 본 연구에서 개발된 Nq 4-6 화합물은 생태독성이 낮고, 겨울철 국내 하천에서 매년 대발생을 일으키는 규조 S. hantzschii만을 특이적으로 제어함을 확인하였으며, 적용 시 식물플랑크톤 종 다양성을 증진시키는 친환경적인 조류제어제로 판단된다.

Keywords

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