摘要
研究重金属镉对家蝇生长发育的影响 ,以及镉在家蝇变态过程中的代谢。结果表明 :低浓度的Cd2 + 对家蝇的生长发育几乎没有什么影响 ,而高浓度的Cd2 + 则影响家蝇卵孵化率、幼虫相对存活率、化蛹率、羽化率、百头幼虫重和百头蛹重。进入家蝇幼虫体内的Cd2 + 主要分布在消化道 ,其次是体壁 ,脂肪体和血淋巴中含量很少。在家蝇变态过程中 ,Cd2 + 的含量变化趋势十分明显 :幼虫期Cd2 + 逐渐累积 ,化蛹后Cd2 + 含量大幅度下降 ,羽化后的第 6天 ,成虫体内只剩下极微量的Cd2 + 。这些结果表明家蝇对环境中重金属镉的反应是一种在自然选择过程中形成的高度的进化适应。
The objective of this study was to elucidate the effects of cadmium on housefly, Musca domestica. It is suggested that of cadmium in low concentrations of had little influence on growth and development of housefly. Cadmium was mainly distributed in the digestive tracts of housefly larvae, where the cadmium content was higher than that of other parts. During the metamorphosis of housefly the change trend of the cadmium content was very apparent. The cadmium content increased gradually in larval period, whereas it decreased significantly after pupariation. Until the sixth day after emergence, only negligible cadmium was left in adult housefly. All these results demonstrated that the response of housefly to cadmium is an evolution adaptation in natural selection.
基金
湖北省自然科学基金 (项目号 :2 0 0 0J0 85 )
华中农业大学科技创新基金资助项目
关键词
镉
代谢
家蝇
生长发育
变态
重金属
cadmium, metabolism, housefly, growth and development, metamorphosis
