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초록

수서생태계에서 중금속 오염은 경제적, 환경보건적으로나 매우 중요한 문제이다. 최근 중금속에 의한 생태계의 안전과 건강성에 대한 우려가 대두되고, 이를 모니터링하고자 하는 시도가 이루어지는 실정이다. 이에 국내산 무갑류인 풍년새우(Branchinella kugenumaensis)를 대상으로 카드뮴(Cd)과 구리(Cu)의 장기간 노출에 따른 생물학적 반응을 파악하고자 하였다. 장기간(30일) 동안 Cd와 Cu에 노출된 풍년새우에서 생존율이 모든 농도에서 통계적 유의수준으로 급격히 감소하였다 (p<0.05). 특히 상대적으로 고농도의 Cd와 Cu 노출된 개체들이 크게 감소한 것으로 나타났고(p<0.01), Cd 노출의 경우 농도 의존적으로 반응이 나타났다. 풍년새우의 성장률 또한 두 중금속 노출 후 모든 농도에서 감소되는 것을 확인하였다. 풍년새우의 내구란 수로 관찰한 생식율은 Cd와 Cu 노출 후 급격히 감소하는 것을 관찰할 수 있었다. 나아가, 장기적인 중금속 고농도 노출에서 풍년새우의 생식이 심각하게 저해되는 반면에, 풍년새우의 성비에는 영향이 크지 않았다. Cd 노출 후에 풍년새우에서 비대칭적인 telson 형태기형이 관찰되었으나 이러한 기형형태는 대조군에서는 전혀 발견되지 않았다. 결론적으로, 본 연구를 통해 Cd와 Cu의 중금속 장기노출에 의해 풍년새우의 생물학적 반응지표들의 변화를 확인하였다. 장기적인 노출실험 결과, 풍년새우는 중금속 노출에 대해 민감한 지표종일 뿐만 아니라 장기적인 수생태계의 모니터링을 위한 기반 자료로 중요한 가치가 있을 것으로 고려되어졌다.

Abstract

Heavy metal contaminants on the aquatic environment are of interest because they can have severe effects on economy and public health. Recently, the studies for monitoring of heavy metals try to do on aquatic system to assess safety and health of ecosystem by heavy metals. Thus, biological responses were investigated on Korean fairy shrimp Branchinella kugenumaensis exposed to cadmium (Cd) or copper (Cu) for long-periods (30 days). The survival rate decreased significantly (p<0.05) on B. kugenumaensis exposed to Cd and Cu at all concentrations. Especially, the highest decrease was observed at the relatively high concentration of Cd and Cu (p<0.01) and the response by Cd exposure was at dose-dependent. The growth rates were also decreased significantly (p<0.05) on B. kugenumaensis exposed to Cd and Cu for at all concentrations. Then, the reproduction rate, numbering cyst, was decreased significantly (p<0.01) on B. kugenumaensis after Cd or Cu exposures. Long exposure of the relatively high concentration Cd and Cu can have severe effects on the reproduction, while exposures of Cd and Cu can not have effects on sex ratios of B. kugenumaensis. Additionally, asymmetric telson deformity was only observed after Cd exposure. Therefore, these results suggest that B. kugenumaensis is a sensitive bio-indicator of heavy metal exposure and these biological responses of B. kugenumaensis give important information for long-term monitoring on aquatic ecosystem.

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이 논문을 인용한 문헌 (3)

  1. Shin, Yun Kyung ; Park, Jung Jun ; Lim, Hyun Sig ; Lee, Jung Sick 2013. "Copper Toxicity on Survival, Respiration and Organ Structure of Mactra veneriformis (Bivalvia: Mactridae)" 한국패류학회지 = The Korean journal of malacology, 29(2): 129~137 
  2. Min, EunYoung ; Kang, Ju-Chan 2014. "Chronic Effects of Copper on Antioxidant Enzymes and Acetylcholinesterase Activities in Rock bream Oplegnathus fasciatus" 한국수산과학회지 = Korean journal of fisheries and aquatic sciences, 47(6): 874~881 
  3. Baeck, SuKyong ; Min, EunYoung ; Kang, Ju-Chan 2014. "Combined effects of copper and temperature on Hematological constituents in the Rock fish, Sebastes schlegeli" 韓國魚病學會誌= Journal of fish pathology, 27(1): 57~65 

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