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해산 로티퍼 (Brachionus plicatilis)의 생존율 및 개체군 성장률을 이용한 신방오물질 (Chlorothalonil)의 독성영향

Toxic effect of chlorothalonil, an antifouling agent, on survival and population growth rate of a marine rotifer, Brachionus plicatilis

최훈|윤성진|박윤호|권기영|이주욱|황운기|허승
한국환경생물학회 (Korean Society Of Environmental Biology)|2021.09|환경생물 (Korean Journal of Environmental Biology)|제39권 제3호|pp. 390-398

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키워드

antifouling agentchlorothaloniltoxicity assessmentmarine rotiferBrachionus plicatilis

초록

어류 치어기의 주요 먹이로 생물로 사용되는 해산 로티퍼 (Brachionus plicatilis)의 생존율 및 개체군 성장률을 이용하여, 국내 연안에 잔류하고 있는 것으로 알려진 신방오물질인 chlorothalonil의 독성을 평가하고자 하였다. B. plicatilis의 생존율은 0.039 mg L-1에서 유의하게 감소하기 시작하여, chlorothalonil의 농도가 증가할수록 감소하는 농도의존성을 나타냈다. 생존율의 무영향농도는 0.020 mg L-1, 최소영향농도는 0.039 mg L-1, 반수영향농도는 0.057 mg L-1로 나타났다. 개체군 성장률 또한 생존율과 마찬가지로 0.313 mg L-1에서부터 농도의존적으로 감소하는 경향을 나타냈다. 개체군 성장률의 무영향농도는 0.156 mg L-1, 최소영향농도는 0.313 mg L-1, 반수영향농도는 0.506 mg L-1 로 나타났다. 본 연구 결과, 해양 생태계 내에서 신방오물질인 chlorothalonil의 잔류 농도가 0.039 mg L-1 이상일 경우 B. plicatilis에게 독성영향을 줄 것으로 예상되며, 본 연구의 생태독성 시험결과를 바탕으로 해양환경 내 chlorothalonil의 독성을 평가하기 위한 기초연구자료 및 다른 방오물질과의 독성영향을 비교평가할 수 있는 자료로 활용될 수 있을 것이다.

Abstract

In this study, the toxicity of chlorothalonil was investigated using survival rate and population growth rate of a marine rotifer, Brachionus plicatilis, typically used in live food in marine aquaculture systems. The survival rate of B. plicatilis was determined after 24 h of exposure to chlorothalonil (0.010-0.156 mg L-1). Population growth rate of B. plicatilis was calculated after 72 h of exposure to chlorothalonil (0.078-1.250 mg L-1). The survival rate and population growth rate of B. plicatilis exposed to chlorothalonil in single-dose toxicity assessment showed concentration-dependent reductions. Survival rates of B. plicatilis exposed to chlorothalonil had the following values: NOEC, 0.020 mg L-1; LOEC, 0.039 mg L-1; and EC50, 0.057 mg L-1. Population growth rate of B. plicatilis exposed to chlorothalonil had the following values: NOEC, 0.156 mg L-1; LOEC, 0.313 mg L-1; and EC50, 0.506 mg L-1. When the residual concentration of chlorothalonil in the marine coastal area was more than 0.039 mg L-1, it had a toxic effect on B. plicatilis, a zooplankton. This paper provides toxicity values that can be used as baseline data for organizing environmental standards of chlorothalonil. It also provides insight into toxic effects of chlorothalonil on other non-target organisms.

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