捕食干扰对Myospalax baileyi种群繁殖力的影响

采用去除法对高原鼢鼠种群繁殖力的变化进行了研究。结果表明，在未受干扰的种群内有５０％的雌性成本不参与繁殖，其平均胎仔数３．４只，种群受干扰后其成体鼠的比例下降，幼体鼠的比例相对提高，繁殖鼠的比例和平均胎仔数均相应增加，随着干扰程度的加剧，其繁殖力也明显增加。土壤硬度和杂类草生物量决定了高原鼢鼠的种群密度，而种群密度是影响繁殖力的主要因素，未受捕食干扰的种群其数量接近于环境容纳量，由于密度作用使其繁

EFFECTS OF PREDATORY DISTURBANCE ON POPULATION REPRODUCTIVITY OF Myospalax baileyi

This paper deals with the change of population reproductivity of plateau zokor after predatory disturbance.The results showed that the nonbreeders adult females occupied 50 percent of the population in the undisturbed population and the mean number of litter size was 3.4 individuals.When the population was disturbed the number of adult decreased,but that of young increased;the number of breeders and litter size also increased,so the reproductivity obviously increased with the increasing degree of predatory disturbance.The population density which was determined by the soil firmness and forbs biomass was the main factor affecting the population reproductivity.In the undisturbed population,the density was closed to the carrying capacity and the reproductivity was low due to function of the density.But in the disturbed population,the density decreased and the intraspecific pressure became relatively lower thus causing an increase of the population reproductivity.