关键词: 布氏田鼠(Lasiopodomys brandtii), 不育控制, 种群增长

Abstract: Using mark-recapture method under enclosure,the influence of different percentages individual sterility on the population of Brandt′s vole(Lasiopodomys brandtii).The results show:(1) there were new-born Brant′s voles in the normal breeding group(control) from June to August,and the reproduction stopped after September.The reproductive rates of female in different months were 45% in June,40% in July,and 33% in August,respectively.The population quantity decreased at the late stage of propagation.The quantity fluctuation in current year appeared as a single-peak curve.The population quantity of each sterility group with different percentage of sterilized individuals presented a downward trend.(2) Individuals of both male and female full sterility groups extincted within three to four months indicating that a population constituted only by overwinter individuals without addition of neonatal individual would die out in short time.(3) The reproductive rates of partial sterility groups were lower than that of control,among which the reproductive rate of male 1/3 sterility group and female 1/3 sterility group were higher than that of male 2/3 sterility group and female 2/3 sterility group,respectively.During the experimental periods,all partial sterility population presented negative growth.This indicates that the mating system of Brant′s vole is not mixed mating.(4) In the partial sterility groups,Brant′s vole born in current year did not participate in mating.It could be that the sterile individuals disturbed their copulation.Therefore,the application of chemosterilant might become an effective measure to control the population of Brant′s vole.

Key words: Brandt′s vole(Lasiopodomys brandtii), Sterility control, Population growth