환경호르몬 비스페놀 A가 Xiphophorus maculatus의 생식에 미치는 영향
Effects of Environmental Endocrine Disruptor Bisphenol A on the Reproduction of Xiphophorus maculatus
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환경호르몬 비스페놀 A가 Xiphophorus maculatus의 생식에 미치는 영향을 알아보기 위하여 수컷을 100ppb, 200ppb, 400ppb, 800ppb의 농도에 3개월간 노출시킨 후 정상의 암컷과 교배시켜 치어수를 계수하여 수컷의 수정능력을 확인하였고, 치어를 6개월 동안 비스페놀 A에 노출시켜 치어의 암수비율, 기형율, 사망률 및 형태학적으로 정자형성과정을 조사하였다. 3개월간 비스페놀 A에 노출시킨 수컷과 정상인 암컷을 교배시켜 얻은 치어수는 정상대조군에서 평균 19.00±3.02마리였으나 비스페놀 A의 농도가 증가함에 따라서 치어수는 100ppb에서 11.50±2.22마리, 200ppb에서 6.40±2.76마리, 400ppb에서 5.70±1.34마리 및 800ppb에서 3.70±2.11마리로 감소하는 경향을 보였다. 치어의 암수비율은 비스페놀 A의 농도와 전혀 상관이 없었고 기형과 사망률은 0%였다. 노출시킨 지 6개월 후 정자형성과정은 800ppb에서도 정상적으로 일어나고 있었다. 이상과 같이 비스페놀 A는 성전환, 수컷의 비율감소, 기형 및 사망에는 전혀 영향을 주지 않았고 단지 출생 개체수에만 영향을 주었다.
Abstract
In this study, we examined effects of environmental endocrine disruptor bisphenol A on the reproduction of Xiphophorus maculatus. We exposed the males of X. maculatus to the bisphenol A adjusted to the various concentrations such as 100ppb, 200ppb, 400ppb and 800ppb for 3 months for the experimental groups and then inbreeded with normal females that was not any treated. We counted the number of second generation for confirmation of fertilizing ability of first generation. Also, we observed the ratios of female and male, the abnormality and mortality, and spermatogenesis of the second generation was exposed to bisphenol A for 6 months.As the result, the number of fry in the second generation was 11.50±2.22 in 100ppb, 6.40±2.76 in 200ppb, 5.70±1.34 in 400ppb and 3.70±2.11 in 800ppb at the experimental groups while it was 19.00±3.02 at the control group which was not treated with bisphenol A. This result showed that the experimental groups exhibited a decreasing tendency according to the increase of bisphenol A concentration comparing with the control group. The ratio of female and male of the second generation had no relations with the concentration of bisphenol A, and the ratios of abnormality and mortality were 0%. The spermatogenesis of experimental groups was normal in 800ppb as well as 100ppb, 200ppb, 400ppb after even 6 months.
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