知识与财富的链接
采用实验生态学方法研究了除草剂百草枯对褶皱臂尾轮虫(Brachionus plicatilis)的摄食和种群动态的影响。结果表明,百草枯对褶皱臂尾轮虫的24hLC50为9.17mg/L,对褶皱臂尾轮虫的摄食具有明显的抑制作用。实验浓度下褶皱臂尾轮虫对小球藻的滤水率和摄食率随百草枯浓度的增加先下降后升高。百草枯对褶皱臂尾轮虫种群动态影响显著,使轮虫的胚胎发育时间、繁殖前期和繁殖后期延长,繁殖期和平均寿命缩短,产卵量和繁殖率降低。轮虫的净生殖率和世代时间均低于对照,不同百草枯浓度下轮虫能够维持一定的种群增长。
In this paper, effects of paraquat on the feeding and population dynamics of Brachionus plicatilis were studied by method of experimental ecology. The results show that the 24h LC50 of paraquat on B. plicatilis was 9.17mg/L. The paraquat had significant effects on the feeding of B. plicatilis. The ingestion rate (IR) and clearance rate (CR) decreased first and then increased with increasing concentration of paraquat. The herbicides showed significant effects on the growth and development of B. plicatilis by expending the durations of its pre-reproductive period, post-reproductive period, and the rotifer’s embryonic development, shortening the durations of its reproduction and mean lifespan, and reducing its egg-laying and fecundity. The net reproduction rate and generation time of B. plicatilis decreased significantly, in comparison with those of control. However, B. plicatilis could maintain certain population increase at the presence of different concentration of paraquat.
