The role of genetic architecture in adaptation to novel environments has received considerable attention when the source of adaptive variation is de novo mutation. Relatively less is known when the source of adaptive variation is inter- or intraspecific hybridization. We model hybridization between divergent source populations and subsequent colonization of an unoccupied novel environment using individual-based simulations in order to understand the influence of genetic architecture on the timing of colonization and the mode of adaptation. We find that two distinct categories of genetic architecture facilitate rapid colonization but that they do so in qualitatively different ways. For few and/or tightly linked loci, the mode of adaptation is via the recovery of adaptive parental genotypes. With many unlinked loci, the mode of adaptation is via the generation of novel hybrid genotypes. The first category results in the shortest colonization lag phases across the widest range of parameter space, but further adaptation is mutation limited. The second category takes longer and is more sensitive to genetic variance and dispersal rate, but can facilitate adaptation to environmental conditions which exceed the tolerance of parental populations. These findings have implications for understanding the origins of biological invasions and the success of hybrid populations. This article is protected by copyright. All rights reserved.

中文翻译：

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遗传结构影响杂交何时以及如何促成殖民

当适应性变异的来源是从头突变时，遗传结构在适应新环境中的作用受到了相当多的关注。当适应性变异的来源是种间或种内杂交时，人们对它的了解相对较少。我们使用基于个体的模拟来模拟不同来源种群之间的杂交和随后无人居住的新环境的殖民化，以了解遗传结构对殖民化时间和适应模式的影响。我们发现两种不同类别的遗传结构促进了快速定植，但它们以不同的方式进行。对于少数和/或紧密连锁的基因座，适应性模式是通过适应性亲本基因型的恢复。有许多未连接的位点，适应模式是通过产生新的杂交基因型。第一类导致在最广泛的参数空间范围内最短的定植滞后阶段，但进一步的适应是突变有限的。第二类需要更长的时间，对遗传变异和扩散率更敏感，但可以促进对超出亲本种群耐受性的环境条件的适应。这些发现对理解生物入侵的起源和杂交种群的成功具有重要意义。本文受版权保护。版权所有。第二类需要更长的时间，对遗传变异和扩散率更敏感，但可以促进对超出亲本种群耐受性的环境条件的适应。这些发现对理解生物入侵的起源和杂交种群的成功具有重要意义。本文受版权保护。版权所有。第二类需要更长的时间，对遗传变异和扩散率更敏感，但可以促进对超出亲本种群耐受性的环境条件的适应。这些发现对理解生物入侵的起源和杂交种群的成功具有重要意义。本文受版权保护。版权所有。