Studies with clonal culture show that female M. macrocopa did not produce male progeny directly, or, in other words, the parthenogenetic(amictic) female could not transform into microtic(amphoteric) female, when suffered from one-off acute or durative progressive stimulation. Under durative progressive stimulation by illumination, temperature, food density or pH, the intrinsic rates of increase were 0.7748, 0.7481, 0.6539 and 0.6310 d-1 ind-1, 0.9%, 4.0%, 16.4% and 19.3% less than the control, respectively, indicating that the animal was more sensitive to the fluctuation of food density and pH followed by temperature.