UV-B辐射对2种海水轮虫的致死效应

The Lethal Effect of UV-B Radiation on Two Species of Marine Rotifers

运用生态毒理学方法研究了UV-B辐射对褶皱臂尾轮虫(Brachionusplicatilis)和壶状臂尾轮虫(Brachionusurceus)的致死效应,旨在为阐明UV-B辐射对海洋生态系统的影响和建立指示UV-B辐射的生态毒理学指标体系提供科学依据。结果表明:UV-B辐射对2种轮虫都有严重的伤害作用,且当辐射强度达一定强度阈值会对其产生急性致死作用。实验测得:UV-B辐射对2种轮虫的急性致死强度阈值为:(50±10)μW/cm2;24h,48h和96h的半致死剂量:褶皱臂尾轮虫为4.393,2.694和1.720kJ/m2;壶状臂尾轮虫为5.856,4.516和1.730kJ/m2。由此可知,本实验UV-B辐射剂量范围和观察时间内,褶皱臂尾轮虫在UV-B辐射处理后的24h和48h内对UV-B辐射的敏感性相对要大于壶状臂尾轮虫,而在UV-B辐射处理后的96h内2种轮虫对UV-B辐射的敏感性则相近。

This paper reports the acute lethal effect of UV-B radiation on two species of marine rotifers （Brachionus plicatilis and Brachionus urceus） with the aim of elucidating the effects of UV-B radiation on the marine ecological system and providing ascientifi basis for building a indices system for denoting UV-B radiation in Eco toxicology. The results showed that the UV-B radiation was very harmful to rotifers and could make acute lethal effect on them when the UV-B radiation intensity achieved some threshold. Moreover, the 24h, 48h and 96h LD50 doses of UV-B radiation for Brachionus plicatilis were 4. 393, 2. 694 and 1. 720 kJ/m^2, respectively. while for Brachionus urceus they were 5. 856, 4. 516 and 1. 730kJ/m^2, respectively. However, both of the two rotifer species had the same acute lethal intensity threshold of UV-B radiation at （50± 10）μW/cm^2. Furthermore, in the radiation dose range of the experiment, the Brachionus plicatilis was more sensitive to UV-B radiation than the Brachionus urceus at 24h or 48h after UV-B radiation treatment, However, there was no significant difference in the sensitivity to UV-B radiation between these two rotifer species at 96h after treatment.