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The availability of tropical copepod Nitocra sp. for marine ecotoxicological evaluation

해양생태독성평가를 위한 열대 요각류 Nitocra sp.의 이용 가능성

  • Lee, Kyun-Woo (Marine Life & Ecosystem Division, Korea Institute of Ocean Science & Technology) ;
  • Choi, Young-Ung (Marine Life & Ecosystem Division, Korea Institute of Ocean Science & Technology)
  • Received : 2016.10.04
  • Accepted : 2016.11.10
  • Published : 2016.11.30

Abstract

Indigenous species are needed for more accurate toxicity assessments in tropical regions. Thus, we determined not only the optimum culture conditions for stable maintenance of Nitocra sp. isolated from tropical regions but also the availability of copepods for marine ecotoxicological evaluation. Experiments on temperature, salinity, and diet as factors for optimum culture conditions as well as acute and chronic toxicity tests for ecotoxicological assessment were carried out. Data on optimum culture conditions were analyzed for statistically significant observations using one-way analysis of variance (ANOVA). Optimum temperature and salinity for Nitocra sp. were $29^{\circ}C$ and 24~39‰, and Nitocra sp. fed Tetraselmis suecica had relatively faster development and higher survival than other microalga. Under optimum culture conditions, toxicity tests were carried out. The $LC_{50}$ level and NOEC (no observed effect concentration) levels of copper and arsenic were calculated in the acute toxicity test. In the chronic test of Cu and As, developmental time and survival traits were usable endpoints for toxicity assessments. As a result, tropical copepod Nitocra sp. seems to be a potential candidate organism for marine ecotoxicological evaluation.

Keywords

Tropical;Copepod;Nitocra sp.;Ecotoxicological evaluation;Endpoint

Acknowledgement

Supported by : 한국해양과학기술원

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