TI:Analysis on the Population Dynamics of Meriones meridianus
AU:DONG Weihui , HOU Xixian , YANG Yuping.
AD:Grassland Research Institute , Chinese Academy of A gricultural Sciences , Hohhot 010010 ,China
【Abstract】Objective To study population dynamics of little Chinese jird ( Meriones meridianus) and its affecting elements. Methods The population dynamics of little Chinese jird was investigated by rectilinear2trap2day method in middle ten days of each month from April to October during 199121998. Results There are ten species of rodents in Dalate County during 199121998. Northern three2toed jerboa ( Dipus sagitta) , desert hamster ( Phodopus roborovskii) , little Chinese jird and striped hamster ( Cricetulus barabensis) accounted for over 10 % ,respectively. The seasonal fluctuation has two peaks every year. In 199121998 , the population dynamics fluctuated with low valley (1991) , increase (1992) , peak (199321994) ,decrease (1995) and low valley(199621998) among 8 years. Annual capture rates are all under 2 % , s (of log x , x = population density of M. meridianus) < 0. 5. Between the number of M. meridianus and pregnant rate , r = | - 0. 758| > r0. 05 = 0. 754 ; Between the number and repregnant rate , r = 0. 827 > r0. 05 = 0. 811 ; Between capture rate in Oct . and capture rate in Apr. next year , r =0. 759 > r0. 05 = 0. 754 , df = 5 ; Between the number of the jird and the number of D. sagitta , P. roborovskii and C. barabensis , r = 0. 662 ( < r0. 05 = 0. 707) ,0. 762 ( > r0. 05 = 0. 707) and 0. 498 ( < r0. 05 = 0. 707) respectively. Conclusion D. sagitta , P. roborovskii , M. meridianus and C. barabensis are the dominant rodent species in Dalate County in 199121998.The population number is maximum in March and in J uly. The annual fluctuation is not periodical. The important elements of population dynamics were the pregnant rate , the repregnant rates , reproduction index , the capture rate and the population number of other species ( D. sagitta , P. roborovskii and C. barabensis) .
【Key words】 Little Chinese jird ( Meriones meridianus) ; Population number ; Pregnant rate ; Reproduction index
