摘要
采用克隆培养法 (编制生命表 )和群体累积培养法 ,研究了长江口疏浚弃土悬沙对褶皱臂尾轮虫(Brachionusplicatilis)的影响 .实验设 0 (CK)、1、3、5、7、9mg·ml-16个悬沙梯度和 2 0、12× 10 6cells·ml-1两个饵料密度 .结果表明 ,克隆培养时 ,悬沙可使该轮虫种群的内禀增长率 (rm)下降 2 9.6 %～ 6 4 .1% ,最大降幅为 130 .0 % .悬沙对轮虫种群的存活率 (lx)有影响 ,而对种群的繁殖率 (mx)无显著影响 .群体累积培养时 ,悬沙对轮虫种群的雌体密度、雄体密度、孤雌生殖卵和休眠卵的密度以及种群的动态变化规律无显著影响 .可见 。
The effect of suspended silt from dredging at Yangtze estuary on Brachionus plicatilis was investigated by clonal culture (to construct life table) and population accumulative culture. The intrinsic increasing rate of the rotifer population was greatly reduced under different concentrations (1, 3, 5, 7 and 9mg·ml -1 ) of silt, from 29.6% to 64.1%, and to a maximum of 130.0%. The suspended silt affected population survival rate, rather than its reproduction rate. In accumulative culture, the densities of female, males, parthenogenetic eggs, and resting eggs in the population were not affected by silt. It was concluded that the presence of suspended silt should have a certain negative influence on the rotifer population in dredging Yangtze estuary.
出处
《应用生态学报》
CAS
CSCD
2002年第7期871-874,共4页
Chinese Journal of Applied Ecology
基金
国家自然科学基金 ( 39770 5 79)
上海市教委曙光计划 ( 99SG0 5 )
农业部重点资助项目 (渔 95 B 96 10 0 1 0 ) .
关键词
长江口
弃土悬沙
褶皱臂尾轮虫
Yangtze estuary, Suspended silt, Brachionus plicatilis .
