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In a population that is not at Hardy-Weinberg equilibrium, the frequency of alleles changes over time. Therefore, any deviations from the five conditions of Hardy-Weinberg equilibrium can alter the genetic variation of a given population. Conditions that change the genetic variability of a population include mutations, natural selection, non-random mating, gene flow, and genetic drift (small population size).
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Monitoring Spatial Segregation in Surface Colonizing Microbial Populations
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空间限制和随机播种颠覆了微生物军备竞赛.

Raymond Copeland1,2, Christopher Zhang2,3, Brian K Hammer3

  • 1School of Physics, Georgia Institute of Technology, Atlanta, Georgia, United States of America.

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微生物群落的大小对竞争结果产生重大影响. 由于随机机会,小环境有利于缓慢杀死细菌的稀有性,而大环境则有利于它们的普遍性.

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科学领域:

  • 微生物生态学 微生物生态学
  • 进化生物学 进化生物学
  • 数学生物学 数学生物学

背景情况:

  • 微生物群落通常存在于规模有限的环境中.
  • 这些尺寸限制对微生物竞争动态的影响尚不清楚.

研究的目的:

  • 研究微生物群落的大小如何影响细菌菌株之间的接触杀伤竞争的结果.
  • 确定有限尺寸效应是否可以改变竞争优势.

主要方法:

  • 基于个体的模型被用来模拟细菌菌株竞争,杀死率和社区规模各不相同.
  • 为了验证模拟结果,使用限制在传输电子显微镜网中的Vibrio cholerae菌株进行了实验.

主要成果:

  • 社区的大小对竞争结果有很大影响;最适合的压力可以在大和小的环境之间有所不同.
  • 在小环境中,初始丰度的随机波动会导致不同的结果,当稀有时有利于缓慢杀死菌株.
  • 相反,在小环境中,随机性可以有利于快速杀死菌株,当缓慢杀死菌株具有数值优势时.

结论:

  • 有限尺寸效应显著改变了对抗性微生物竞争.
  • 殖民地规模可以通过改变竞争动态来破坏微生物军备竞赛.