种群起始密度对萼花臂尾轮虫休眠卵形成的影响

应用群体累积培养法，研究了种群起始密度对萼花臂尾轮虫休眠卵的形成及之相关的混交雌体百分率和受精率的影响，结果表明，在连续１１ｄ的培养中，轮虫休眠卵的产量和形成效率以及种群中的平均混交雌体百分率以种群起始密度为１．０－１０．０ｉｎｄ．ｍｌ＾－１组最大，２０．０ｉｎｄ．ｍｌ＾－１组次之，５０．０ｉｎｄ．ｍｌ＾－１组最小，各组间的平均混交雌体受精率则无显著差异，对轮虫休卢卵最大形成效率及其出现的时间以及

Effect of initial population density on resting egg formation of rotifer Brachionus calyciflorus

With the method of population accumulative culture, the effect of initial population density on the formation of resting eggs of freshwater rotifer(Brachionus calyciflorus), and on the rates of mictic female and fertilization was studied. During 11 days culture, the productivity and the formation efficiency of resting eggs, and the mean rate of mictic female were the biggest when the initial population density was 1.0-10.0 ind.ml-1, second by the density of 20.0 ind.ml-1, and the lowest by the density of 50.0 ind.ml-1. There was no significant effect of initial population density on the fertilization rate. Statistical analysis on maximum formation efficiency of resting eggs, their emergence and productivity showed that when the production of resting eggs was large-scaled proceeded, the feasible initial population density should be 10.0 ind.ml-1, and the corresponding time should be 6 days to obtain a higher yield of resting eggs and a higher formation efficiency.