摘要
目的 研究引起子午沙鼠种群数量变动的影响因子。方法 1991～ 1998年每年 4～ 10月中旬利用直线夹日法 ,在达拉特旗沙地草场不同生境内进行数量调查 ,捕获鼠按常规称重、测量后解剖 ,详细记录繁殖情况 ,对有关数据进行分析。结果 8年共捕鼠 10种 843 4只 ,其中三趾跳鼠、小毛足鼠、子午沙鼠和黑线仓鼠数量均超过鼠类群落组成的10 % ,子午沙鼠位居第 3位。子午沙鼠种群数量随季节和年际变化明显 ,年际数量变动受怀孕率、二次怀孕率、繁殖指数、月捕获率及其他 3种鼠数量变化等因素的影响。结论 了解子午沙鼠种群数量变化因子及其相互关系 ,可为预测预报和鼠类防制提供依据。
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 rectilinear trap day method in middle ten days of each month from April to October during 1991 1998. Results There are ten species of rodents in Dalate County during 1991 1998. Northern three toed 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 1991 1998, the population dynamics fluctuated with low valley(1991), increase(1992), peak(1993 1994),decrease(1995) and low valley(1996 1998) 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|> r 0.05 =0.754; Between the number and repregnant rate, r =0.827> r 0.05 =0.811; Between capture rate in Oct.and capture rate in Apr. next year, r = 0.759 > r 0.05 =0.754, df =5; Between the number of the jird and the number of D.sagitta , P.roborovskii and C.barabensis , r =0.662(< r 0.05 = 0.707 ), 0.762 (> r 0.05 = 0.707 ) and 0.498(< r 0.05 = 0.707 ) respectively. Conclusion D.sagitta ,P.roborovskii,M.meridianus and C.barabensis are the dominant rodent species in Dalate County in 1991 1998. The population number is maximum in March and in July. 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 ).
出处
《中国媒介生物学及控制杂志》
CAS
CSCD
北大核心
2005年第1期23-25,共3页
Chinese Journal of Vector Biology and Control
基金
"八五"
"九五"农业部重点课题的部分内容。
关键词
子午沙鼠
种群数量
动态分析
怀孕率
繁殖指数
草原害鼠
Little Chinese jird ( Meriones meridianus )
Population number
Pregnant rate
Reproduction index
