EP-1与溴敌隆对长爪沙鼠野生种群增长的控制作用

2010年3—10月,在内蒙古鄂尔多斯荒漠草原分别设置不育剂试验区、毒饵试验区和对照区3个样区,采用春季一次性足量投饵、按月铗捕统计种群相对数量的方法,比较了不育剂EP-1和毒饵溴敌隆对长爪沙鼠Meriones unguiculatus野生种群数量增长的控制作用。结果显示,EP-1改变了 长爪沙鼠种群的年龄结构,不育剂区与毒饵区成体组成差异显著(F_{2, 14}=5.89,P<0.05),降低了长爪沙鼠幼体出生率和全年种群密度,全年幼体数量和总体种群数量均呈下降趋势(R₃²=0.8552,R₄²=0.5126)。EP-1对长爪沙鼠种群增长有持续控制作用,而溴敌隆对长爪沙鼠种群的有效杀灭作用只持续3个月,仅是短期控制。

Comparison effects of sterility and lethal controlling on Mongolian gerbil population

From March to October in 2010, we have used EP-1 (levonorgestrel-quinestrol), a compound sterility mixture, and poisoned baits (bromadiolone), to conduct contraception and lethal controlling contrast experiments on Mongolian gerbil, Meriones unguiculatus, wild population with one-time enough EP-1 and poison baits in spring in Ordos Desert Grasslands, Inner Mongolia. The experiments were conducted in the following aspects: sterile experimental, lethal experimental and control areas, respectively. The gerbils were captured by trapping monthly. The results showed that not only gerbil population age structures were changed, but also population densities and juvenile recruitments have significantly reduced in the sterile experimental area in which EP-1 was used, and the gerbil adults ratio differences were significant in population compared with lethal area (F_{2, 14}=5.89, P<0.05), the juvenile recruitments and population densities were on a declining curve (R₃²=0.8552, R₄²=0.5126). The EP-1 results an effective sustained control to gerbil population. However, the lethal controlling effects to gerbil population was continued only for three months, which functioned as a short-term controlling effects.