The Sea:JOURNAL OF THE KOREAN SOCIETY OF OCEANOGRAPHY (한국해양학회지:바다)

The Korean Society of Oceanography (한국해양학회)
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Development of Ecotoxicological Standard Methods using Early Life Stage of Marine Rotifer Brachionus plicatilis and Benthic Copepod Tigriopus japonicus

윤충류 Brachionus plicatilis 및 저서 요각류 Tigriopus japonicus의 초기 생활사를 이용한 해양생태독성시험 방법에 관한 연구

  • 이승민 (국립수산과학원 서해수산연구소) ;
  • 박경수 (안양대학교 해양생명공학과) ;
  • 윤성진 ((주)바이오니아) ;
  • 강영실 (국립수산과학원 해양생태연구과) ;
  • 오정환 (부산대학교 생명과학과)
  • Published : 2008.05.31
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Abstract

Marine ecotoxicological standard method was applicated using marine rotifer and benthic copepod as primary consumer of marine ecosystem. Marine rotifer, Brachionus plicatilis and benthic copepod, Tigriopus japonicus were designated as standard test species with the endpoints of 24hr neonate mortality (24hr $LC_{50}$) and 48hr population growth (48hr $EC_{50}$) for rotifer, and 48hr nauplius mortality (48hr $LC_{50}$) for benthic copepod. Tests method was referred to those of ASTM (American Society for Testing and Materials) with the replacement of test species which are widely distributed in Korean waters. The two species showed a wide tolerance on salinity ($5{\sim}35\;psu$) and can be easily cultured in small space even they were not as sensitive as in the mortality test using the nauplius of marine invertebrates. However, these species revealed the significant "concentrationresponse relationship" tested with ocean disposal wastes, and reproducibility using cadmium as standard reference material between laboratories. Accordingly, these two species have good potential as test species for marine ecotoxicological test species. Also, we strongly recommend that at least one of these species be included in the test species of "battery test" in marine bioassay.

해양생태독성평가를 위한 표준시험방법 개발을 위하여 해양생태계의 1차 소비자인 윤충류 및 저서 요각류를 이용한 시험방법을 정립하였다. 표준시험생물로 윤충류 Brachionus plicatilis와 저서 요각류 Tigriopus japonicus를 선정하였으며, endpoint는 윤충류 신생개체의 사망률(24 hr $LC_{50}$) 및 개체군성장률(48 hr $EC_{50}$)과 저서 요각류 유생($100{\sim}200\;{\mu}m$)의 사망률(48 hr $LC_{50}$)로 설정하였다. 표준시험방법은 미국재료시험협회 (ASTM)의 독성시험법을 참고하였으며, 표준시험생물은 국내 해양생태계의 특성 및 종의 유용성 등을 고려하여 재설정하였다. 윤충류 B. plicatilis와 저서 요각류 T. japonicus는 광염성으로 $5{\sim}35\;psu$ 구간에서 실험이 가능하고, 또한 배양이 용이한 점이 고려되었다. 상기 두 종을 이용한 독성시험은 시험생물 확보 및 배양이 쉽고 시험기간이 짧고 간단한 장점이 있는 반면 독성시험의 민감도가 무척추동물의 유생을 이용한 시험법보다 떨어지는 단점이 있다. 두 종 모두 해양유입 유해물질을 이용한 독성실험결과, 농도-반응의 선형관계가 뚜렷하였다. 카드뮴을 이용한 윤충류 개체군성장에 대한 실험실간 교차분석결과 $EC_{50}$이 각각 39.3 mg/L와 33.7 mg/L로 유사한 값을 보였다. 따라서 윤충류 및 저서 요각류는 독성시험생물로서 유용한 것으로 판단되며, 위의 두 종중 최소 1종은 해양생태 독성실험의 "battery test"에 포함할 것을 권장한다.

Keywords

References

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