不同藻密度下Cd2+浓度对萼花臂尾轮虫生命表统计学参数的影响 |
| |
引用本文: | 石 娟,席贻龙,杨琳璐,汪圣广,陈枫华,苏田娟. 不同藻密度下Cd2+浓度对萼花臂尾轮虫生命表统计学参数的影响[J]. 生态学杂志, 2010, 21(6): 1614-1620 |
| |
作者姓名: | 石 娟 席贻龙 杨琳璐 汪圣广 陈枫华 苏田娟 |
| |
作者单位: | 安徽师范大学生命科学学院安徽高校生物环境与生态安全省级重点实验室,安徽芜湖 241000 |
| |
摘 要: | 为了比较不同食物密度下污染物浓度对受试生物的慢性毒性,筛选出以轮虫为受试生物对水环境中Cd污染进行监测的敏感指标,研究了在不同斜生栅藻密度(1.0×106、3.0×106和5.0 ×106 cells·ml-1)下不同浓度(2.5、5.0、10.0、20.0和40.0 μg·L-1)Cd2+对萼花臂尾轮虫生命表统计学参数的影响.结果表明:(25±1) ℃下Cd2+对轮虫的24 h LC50为37.7 μg·L-1.与各藻密度下的对照组相比,当藻密度为1.0×106 cells·ml-1时,20.0和40.0 μg·L-1的Cd2+显著延长了轮虫的世代时间,5.0 μg·L-1的Cd2+显著提高了轮虫的后代混交率;当藻密度为3.0×106 cells·ml-1时,除了5.0 μg·L-1外,其他浓度的Cd2+显著降低了轮虫的后代混交率;而当藻密度为5.0×106 cells·ml-1时,Cd2+浓度对轮虫的所有生命表统计学参数均无显著影(P>0.05).藻密度对轮虫的世代时间、生命期望、净生殖率和后代混交率均有显著影响(P<0.05),Cd2+浓度对轮虫的世代时间和后代混交率有显著影响(P<0.05),两者交互作用对后代混交率有极显著影响(P<0.01).轮虫的世代时间和后代混交率是在1.0×10.6和3.0×10.6 cells·ml-1食物密度下对Cd2+污染比较敏感的参数,其中后代混交率最敏感.
|
关 键 词: | Cd2+浓度 萼花臂尾轮虫 斜生栅藻 生命表统计学参数 |
Effects of Cd2+concentration on life table demography ofBrachionus calyciflorus under differentScenedesmus obliquus density. |
| |
Affiliation: | Anhui Province Key Laboratory of Biotic Environment and Ecological Safety, College of Life Sciences, Anhui Normal University, Wuhu 241000, Anhui, China |
| |
Abstract: | In order to understand the chronic toxicity of a pollutant to an organism in an aquatic environment with different food density, and screen out sensitive endpoints for monitoring Cd2+ pollution with rotifers as test animals, this paper studied the effects of different concentration (2.5, 5.0, 10.0, 20.0 and 40.0 μg·L-1) Cd2+ on the life table demography of Bracionus calyciflorus at the Scenedesmus obliquus density being 1.0×106, 3.0×106, and 5.0×106 cells·ml-1. The results showed that at 25±1 ℃, the 24 h LC50 of Cd2+to B. calyciflorus was 37.7 μg·L-1. Compared with the controls at the same food density, when the S. obliquus density was 1.0×106 cells·ml-1, 20.0 and 40.0 μg·L-1 of Cd2+prolonged the generation time of B. calyciflorus significantly, and 5.0 μg·L-1of Cd2+ increased the percentage of B. calyciflorusmictic offspring. When the S. obliquus density was 3.0×106 cells·ml-1, the Cd2+at all test concentrations except 5.0 μg·L-1 decreased the percentage of mictic offspring; when the S. obliquus density was 5.0×106 cells·ml-1, all test concentration Cd2+ had no effects on the life table demography (P>0.05). S. obliquus density had significant effects on the generation time, life expectancy at birth, net reproduction rate, percentage of mictic offspring of B. calyciflorus (P<0.05), Cd2+ concentration had significant effects on the generation timeand the percentage of mictic offspring (P<0.05), and the interaction of S. obliquus density and Cd2+ concentration had significant effects on the percentage of mictic offspring ( P<0.01). Among all the studied parameters, the generationtime and the percentage of mictic offspring were more sensitive to Cd2+ pollution under the algal densities of 1.0×106 and 3.0 ×106 cells·ml-1, with the latter being the most sensitive. |
| |
Keywords: | Cd2+ concentration Brachionus calyciflorus Scenedesmus obliquus life table demography |
|
| 点击此处可从《生态学杂志》浏览原始摘要信息 |
|
点击此处可从《生态学杂志》下载全文 |
|