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arXiv 1902.02155math.PRq-bio.PE
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Cannings模型、总体规模变化与多重合并

Cannings models, population size changes and multiple-merger coalescents

Fabian Freund

摘要:

多合并者,例如$Λ$ - $n$ -合并合并者,已经被提出作为一系列群体的$n$采样个体的系谱模型,这些群体的系谱结构不能被Kingman的$n$ -合并者很好地捕获。$Λ$ -coalescents可以看作是当时间重新标度和$N\to\infty$为总体规模时,具有固定总体规模的Cannings模型的离散谱系的极限过程。如Kingman的$n$ -聚结所建立的,离散群体模型中的适度总体规模波动应通过极限聚结的时间变化来反映。对于$Λ$ - $n$ -聚结剂,这仅在$Λ$ - $n$ -聚结剂的有限亚类和指数增长的群体中明确显示。本文给出了时变$Λ$ - $n$ -聚结子的一般构造,作为具有相当任意时变的特定Cannings模型的极限。

英文摘要:

Multiple-merger coalescents, e.g. $Λ$-$n$-coalescents, have been proposed as models of the genealogy of $n$ sampled individuals for a range of populations whose genealogical structures are not captured well by Kingman's $n$-coalescent. $Λ$-$n$-coalescents can be seen as the limit process of the discrete genealogies of Cannings models with fixed population size, when time is rescaled and population size $N\to\infty$. As established for Kingman's $n$-coalescent, moderate population size fluctuations in the discrete population model should be reflected by a time-change of the limit coalescent. For $Λ$-$n$-coalescents, this has been explicitly shown for only a limited subclass of $Λ$-$n$-coalescents and exponentially growing populations. This article gives a general construction of time-changed $Λ$-$n$-coalescents as limits of specific Cannings models with rather arbitrary time changes.

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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