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REPRODUCTION AND DENSITY-DEPENDENT REGULATION IN POPULATION OF MANDARIN VOLE(MICROTUS MANDARINUS)

TAI Fadao, ZHAO Yajun, WANG Tingzheng   

  • Online:2006-07-25 Published:2008-07-07

棕色田鼠种群繁殖特征及密度制约调节

邰发道,赵亚军,王延正   

  1. 陕西师范大学生命科学学院,西安

Abstract: Based upon the investigation of population ecology of mandarin vole during 1992-1994 in suburban area of Lingbao city, Henan province, we obtained the following results. The total sex ratio (female/male)was 1.2073(females 961, males 796). The mandarin vole reproduces in each month. The pregnancy rate, the litter size, the sex ratio, the reproduction index and the descended testis rate showed obvious yearly and seasonal differences, and were different in different age groups. The studies also revealed that reproduction characteristics were regulated obviously by population density. Under the years when the population density was increased, we observed that the sex ratio, pregnancy rate and reproduction index were lower. In the grids of high-density population, the reproductive intensity was suppressed too. Percentage of pregnant females, descendant testis rate were lower than those in the grids of low density population.

Key words: Mandarin vole(Microtus mandarinus), Reproduction traits, Density-dependent regulation

摘要: 1992-1994年在河南灵宝市郊黄土高原农作区春夏秋逐月捕获并解剖棕色田鼠1757只(雌性961只,雄性796只),总性为1.2073。全年都有繁殖鼠出现,但怀孕率、胎仔数、性比、繁殖指数有明显的季节变化,年间也有一定的差异。不同年龄组的性比、怀孕率、胎仔数、性比、繁殖指数、睾丸下降率不同。种群密度对繁殖特征有明显的调节作用。高密度年份的棕色田鼠的性比、怀孕率和繁殖指数低于低密度年份。高密度区种群的繁殖强度受到抑制,雌鼠怀孕率、睾丸下降率低于低密度种群。

关键词: 棕色田鼠, 繁殖特征, 密度制约调节