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arXiv 1709.03031q-bio.PE
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Moran过程中的环境适合度异质性

Environmental fitness heterogeneity in the Moran process

Kamran Kaveh, Alex McAvoy, Martin A. Nowak

摘要:

许多进化的数学模型都假设所有个体都经历相同的环境。在这里,我们研究的Moran过程在异构环境中。种群的规模有限,有两种相互竞争的类型,它们暴露在固定数量的环境条件下。繁殖率是由类型和环境决定的。我们首先计算选择的条件,以有利于突变体相对于居民野生型。在大种群中,当且仅当突变体的空间平均繁殖率超过居民时,突变体才受到青睐。但是环境的异质性揭示了突变体和原住民之间有趣的不对称性。具体来说,突变体的异质性抑制了它的固定概率;如果这种异质性足够强,它甚至可以完全抵消选择的影响(包括在大种群中)。相反,居民异质性对突变体在大群体中的固定概率没有影响,并且可以在小群体中放大它。

英文摘要:

Many mathematical models of evolution assume that all individuals experience the same environment. Here, we study the Moran process in heterogeneous environments. The population is of finite size with two competing types, which are exposed to a fixed number of environmental conditions. Reproductive rate is determined by both the type and the environment. We first calculate the condition for selection to favor the mutant relative to the resident wild type. In large populations, the mutant is favored if and only if the mutant's spatial average reproductive rate exceeds that of the resident. But environmental heterogeneity elucidates an interesting asymmetry between the mutant and the resident. Specifically, mutant heterogeneity suppresses its fixation probability; if this heterogeneity is strong enough, it can even completely offset the effects of selection (including in large populations). In contrast, resident heterogeneity has no effect on a mutant's fixation probability in large populations and can amplify it in small populations.

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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