温度和食物密度对裂足臂尾轮虫(Brachionus diversicornis)生命表统计学参数的影响  

Combined effects of temperature and algal food density on life table demography of Brachionus diversicornis (Rotifera)

作　　者：宁乐锋[1] 席贻龙[1] 孙强[1] 周澳[1] 

机构地区：[1]安徽师范大学生命科学学院,安徽省高校生物环境与生态安全省级重点实验室,芜湖241000

出　　处：《湖泊科学》2013年第2期295-301,共7页Journal of Lake Sciences

基　　金：国家自然科学基金项目(31170395);安徽省高校生物环境与生态安全省级重点实验室专项基金项目(2004sys003);重要生物资源保护和利用研究安徽省重点实验室专项项目联合资助

摘　　要：运用单个体培养方法研究了温度(15、20、25和30℃)和斜生栅藻(Scenedesmus obliquus)密度(1.0×106、3.0×106和5.0×106cells/ml)对裂足臂尾轮虫(Brachionus diversicornis)出生时的生命期望、世代时间、总生殖率、净生殖率、种群内禀增长率和后代混交率等生活史参数的影响.结果表明,温度对轮虫出生时的生命期望、世代时间、净生殖率和总生殖率均有显著的影响,但对种群内禀增长率和后代混交率无显著的影响;食物密度对轮虫的净生殖率和总生殖率均有显著的影响,但对轮虫出生时的生命期望、世代时间、种群内禀增长率和后代混交率均无显著的影响;食物密度与温度之间的交互作用对轮虫所有生命表统计学参数均无显著影响.轮虫出生时的生命期望和世代时间均随着温度的升高而逐渐显著缩短.轮虫的净生殖率在15℃下最低,30℃下最高,20和25℃间无显著差异;轮虫的总生殖率在15℃下较低,20、25和30℃下较高且三者间无显著差异;轮虫的净生殖率和总生殖率均在3.0×106cells/ml食物密度下较高,1.0×106和5.0×106cells/ml食物密度下较低且两者间无显著差异.Effects of temperature （ 15, 20, 25 and 30℃ ） and Scenedesmus obliquus density （ 1.0 ×106 , 3,0 ×106 and 5.0 ×106 cells/ml） on life history parameters including life expectancy at hatching, generation time, gross reproductive rate, net reproduc- tive rate, intrinsic rate of population increase and proportion of sexual oft^pring of Brachionus diversicornis were studied by means of individual culture. Results showed that temperature affected significantly life expectancy at hatching, generation time, gross repro- ductive rate, net reproductive rate and intrinsic rate of population increase, but did not affect proportion of sexual offspring. Food level affected markedly gross reproductive rate and net reproductive rate, but had no effect on life expectancy at hatching, genera- tion time, intrinsic rate of population increase and proportion of sexual offspring. The interaction between food level and tempera- ture did not significantly influence all the life table demographic parameters. Both the life expectancy at hatching and the generation time decreased with increasing temperature. The lowest and highest net reproductive rate was obtained at 15 and 30℃, respective- ly; while with no difference between 20 and 25 ℃. The gross reproductive rate was lower at 15 ~C than those at 20, 25 and 30℃, and no difference was observed among those at the latter three temperatures. Both the net reproductive rate and the gross reproduc- tive rate were higher at 3.0 × 106 cells/ml than those at 1.0 × 106 and 5.0 × 106 cells/ml of Scenedesmus obliquus, and those at the two latter food levels were similar.

关 键 词：裂足臂尾轮虫 温度 食物密度 生活史特征 单个体培养 

分 类 号：Q958.8[生物学—动物学]