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arXiv 0705.2607q-bio.PE
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非结构总体中的人口统计学随机性选择

Selection Against Demographic Stochasticity in Age-Structured Populations

Max Shpak

摘要:

研究表明,繁殖力方差的差异可以影响种群中基因型的入侵概率,即后代数量方差较低的基因型在有限种群中可能受到青睐,即使它的平均适合度比竞争者略低。在本文中,Gillespie的结果被扩展到人口遗传系统的明确的年龄结构,在人口统计方差(增长率的方差)的工作中计算的Engen和同事被用来作为一个推广的“后代数量的方差”来预测之间的相互作用的确定性和随机的力量驱动的等位基因频率的变化。通过计算方差的生活史〈动〉<动>参数,它表明,选择对方差的增长率将有利于基因型具有较低的随机性,年龄特异性的生存和生育率。一个扩散近似的选择和漂移的两种基因型与不同的生活史〈动〉<动>矩阵(因此,不同的增长率和人口统计学方差)的人口推导和显示是一致的与个人为基础的模拟。有人还认为,对于有限的人口,扰动分析的增长率和人口方差可能是必要的,以确定“健身”(广义)的生活史<动>参数的变化的敏感性。

英文摘要:

It has been shown that differences in fecundity variance can influence the probability of invasion of a genotype in a population, i.e. a genotype with lower variance in offspring number can be favored in finite populations even if it has a somewhat lower mean fitness than a competitor. In this paper, Gillespie's results are extended to population genetic systems with explicit age structure, where the demographic variance (variance in growth rate) calculated in the work of Engen and colleagues is used as a generalization of "variance in offspring number" to predict the interaction between deterministic and random forces driving change in allele frequency. By calculating the variance from the life history parameters, it is shown that selection against variance in the growth rate will favor a genotypes with lower stochasticity in age specific survival and fertility rates. A diffusion approximation for selection and drift in a population with two genotypes with different life history matrices (and therefore, different growth rates and demographic variances) is derived and shown to be consistent with individual based simulations. It is also argued that for finite populations, perturbation analyses of both the growth rate and demographic variances may be necessary to determine the sensitivity of "fitness" (broadly defined) to changes in the life history parameters.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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