斜生栅藻密度对新安江萼花臂尾轮虫种群动态的影响  

Effects of Scenedesmus obliquus density on the population dynamics of Brachionus calyciflorus from Xin'an River

作　　者：董丽丽[1] 杨景伟[1] 岑梓龙[1] 黄松[1] 

机构地区：[1]黄山学院生命与环境科学院,安徽黄山245041

出　　处：《生态学杂志》2012年第1期124-130,共7页Chinese Journal of Ecology

基　　金：国家自然科学基金项目(30870290;31071891);安徽省教育厅优秀青年人才基金项目(2010SQRL168);黄山学院科研项目(2010xkj001)资助

摘　　要：以浓度分别为1.0×106、2.0×106、4.0×106和8.0×106cells·mL-1的斜生栅藻(Scenedesmus obliquus)为轮虫食物,在25℃下,应用群体累积培养和单个体培养法研究了食物浓度对采自新安江水域(屯溪段)的萼花臂尾轮虫的种群动态影响。结果表明:食物浓度对轮虫的种群增长率和休眠卵产量均有显著的影响,均表现为低食物浓度下(≤4.0×106cells·mL-1)萼花臂尾轮虫的种群增长率和休眠卵产量较小且无差异,高食物浓度下(8.0×106cells·mL-1)轮虫的种群增长率和休眠卵产量较大;食物浓度对轮虫的混交雌体百分率和受精率无显著影响;在食物浓度为4.0×106cells·mL-1时萼花臂尾轮虫的净生殖率最大,世代时间最长,而其内禀增长率在食物浓度为1.0×106cells·mL-1时最小;在食物浓度为8.0×106cells·mL-1时平均寿命和生命期望最长。With 1.0×10^6, 2.0×10^6,4.0×10^6, and 8.0×10^6 cells·mL^-1 of Scenedesmus obliquus as the food of Brachionus calyciflorus, and by using population accumulative culture method and life table demographic approach, this paper studied the effects of S. obliquus density on the population dynamics of B. calyciflorus collected from the Tunxi section of Xin’an River at 25 ℃. The results showed that food concentration had significant effects on the population growth rate and resting egg production of B. calyciflorus. At lower food concentrations （≤4.0×10^6 cells·mL^-1）, the population growth rate and resting egg production of B. calyciflorus were lower and had no differences, while at high food concentration （8.0×10^6 cells·mL^-1）, both the population growth rate and the resting egg production were larger. Food concentration had no significant effects on the mixture rate and fertilization rate of B. calyciflorus. At food concentration 4.0×10^6 cells·mL^-1, the net reproductive rate and generation time of B. calyciflorus were the highest and longest, respectively. The intrinsic rate of population increase of B. calyciflorus at food concentration 1.0×10^6 cells·mL^-1 was the smallest, and the average lifespan and life expectancy at food concentration 8.0×10^6 cells·mL^-1 were the longest.

关 键 词：萼花臂尾轮虫 种群增长率 休眠卵产量 食物浓度 

分 类 号：Q958.8[生物学—动物学]