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首页> 外文期刊>Canadian Journal of Zoology >Effective population size and genetic structure of a Piute ground squirrel(Spermophilus mollis) population
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Effective population size and genetic structure of a Piute ground squirrel(Spermophilus mollis) population

机译：琵琶鼠（Spermophilus mollis）种群的有效种群大小和遗传结构

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Piute ground squirrels (Spermophilus mollis) are distributed continuously in habitat dominated by native shrubs and perennial grasses in the Snake River Birds of Prey National Conservation Area in Idaho, U.S.A. This habitat is being fragmented and replaced by exotic annual plants, changing it to a wildfire-dominated system that provides poor habitat for ground squirrels. To assess potential effects of this fragmentation on ground squirrel populations, we combined an estimate of effective population size (N-e) based upon a demographic study with a population genetic analysis. The study area included three subpopulations separated from each other by 8-13 km. The ratio of effective population size to census number (N-e/N) was 0.57. Combining N-e/N with dispersal distances from a radio-tracking study, we calculated that neighborhood size was 62.2 ha, which included between 204 and 480 individuals. Our population genetic analysis (based on randomly amplified polymorphic DNA (RAPD) and microsatellite markers) showed relatively low levels of genetic differentiation (Theta (populations) congruent to 0.07-0.10) between subpopulations and no inbreeding within subpopulations (f = 0.0003). These estimates of population subdivision translate into an effective migration rate (N(e)m) of 2.3-3.3 per year, which represents a high level of gene Row. Invasion by exotics will reduce the overall productivity of the habitat, and will lead to isolation among subpopulations if favorable habitat patches become isolated.
机译：有毒的地面松鼠（Spermophilus mollis）连续分布在美国爱达荷州蛇河国家野生动物保护区的以蛇麻草和多年生草为主的栖息地中。该栖息地被零碎的外地植物取代，变成了野火。为主的系统，为地松鼠提供了恶劣的栖息地。为了评估这种破碎对地松鼠种群的潜在影响，我们结合了基于人口统计学研究和种群遗传分析的有效种群规模（N-e）估计值。研究区域包括三个亚群，彼此间隔8-13公里。有效人口规模与人口普查数的比率（N-e / N）为0.57。结合无线电跟踪研究的N-e / N和传播距离，我们计算出邻里面积为62.2公顷，其中包括204至480个人。我们的群体遗传分析（基于随机扩增的多态性DNA（RAPD）和微卫星标记）显示亚群之间的遗传分化水平相对较低（Theta（群）等于0.07-0.10），并且亚群内无近亲繁殖（f = 0.0003）。这些对人口细分的估计转化为每年2.3-3.3的有效迁移率（N（e）m），这表示高水平的Row基因。外来物种的入侵将降低栖息地的整体生产力，如果隔离有利的栖息地，则会导致亚种群之间的隔离。

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