Journal of Life Science (생명과학회지)

Korean Society of Life Science (한국생명과학회)
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Effects of TBTCl on the Behavior and Reproduction of the Guppy (Poecilia reticulata)

TBTCl이 구피(Poecilia reticulata)의 행동과 번식에 미치는 영향

  • 윤명희 (경성대학교 이과대학 생물학과) ;
  • 오지현 (경성대학교 이과대학 생물학과)
  • Published : 2004.02.01
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Abstract

Sexually matured guppies (Poeiria reticulata) were exposed to TBTCI (0.1, 0.32, 1, 3.2, 10, 25, 32, 50, 75 and 100 $\mug/l$) for 144 hours to determine the bioaccumulation rate and effects on the reproduction and behavior. The ratio of TBT residues to $\SigmaBTs\; (TBT:\SigmaBTs)$ was 67% or higher in all the guppies exposed to TBTCl, and the higher the level of TBTCl exposed, the higher the ratio of TBT:∑BTs, suggesting that the higher the level of TBTCl exposed, the lower the metabolism rate of the fish. TBTCl exposure led to a poor reproductivity and an abnormal sexual behavior in the fish, i.e. a reduced number of the male sexual sigmoid display and of spermatophore in the efferent duct was observed in the fish exposed to 0.1 $\mug/l$ and higher levels of TBTCl, and a decreasing ratio of the testicular spermatophore cyst to the whole germ cell cysts was observed in the fish exposed to 0.32∼10 $\mug/l$)of TBTCl. The reduced ratio of the spermatophore cyst seems to be an effect of the endocrine disrupter inhibiting spermiogenesis. In the fish exposed to 25 $\mug/l$ and higher levels of TBTCl, more serious effects, such as a rapid increase of mortality, the necrosis of most of the germ cells, great damages in Sertoli cells and epithelial cells of the efferent duct, a significant increase of abnormal swimming behavior, and a cessation of feeding were observed, which suggest the acute toxicity of TBTCl inhibiting not only the reproduction and behavior but also the survival of the fish itself.

TBTCl(0.1, 0.32, 1, 3.2, 10, 25, 32, 50, 75 및 100 $\mug/l$)을 구피에게 144시간 동안 노출시켜 TBTCl의 구피 생체 내 축적정도 및 구피의 번식과 행동에 미치는 영향에 대해서 조사하였다. 0.1 $\mug/l$ 이상의 모든 TBTCl 실험군에서 $\SigmaBTs\; (TBT:\SigmaBTs)$가 67% 이상으로 매우 높았고, 고농도 실험군일수록 이 비율이 높아져, 고농도의 TBTCl에 노출될수록 구피의 대사능력이 저해됨을 알 수 있었다. 또한 TBTCl은 구피의 번식력을 약화시키고 행동이상을 유발함이 밝혀졌다. 즉, 0.1$\mug/l$의 실험군부터 수컷의 구애행동과 수출관 내 정포의 수가 감소되었고, 0.32∼10 $\mug/l$의 실험군에서는 정소 내 전체 생식세포낭에 대한 정포낭의 수도 점차 감소하여 TBTCl이 정자변태 과정에 영향을 미치는 내분비계 장애물질로서 작용하고 있음이 시사되었다. 더욱이 25 $\mug/l$이상의 고농도군에서는 단기간 내에 치사율이 증가하고, 생식세포가 괴사되고, 정소의 지지세포와 수출관 내의 상피세포가 상해되고, 유영행동 이상이 급증하고, 섭식이 중단되는 등 급성독성이 관찰되어, TBTCl이 구피의 번식 뿐 아니라 생존을 저해하고 있음이 시사되었다.

Keywords

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