Evolution is more repeatable in the introduction than range expansion phase of colonization
Evolution is more repeatable in the introduction than range expansion phase of colonization
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DOI：
10.1093/evlett/qrad063
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发表时间：
2023-12-29
影响因子：
5
通讯作者：
Melbourne，Brett A.
中科院分区：
文献类型：
--
作者：
Tittes，Silas;Weiss-Lehman，Christopher;Melbourne，Brett A.
基因组和表型尺度上的进化可重复性如何？我们使用赤拟谷盗进行了重复的微观实验，研究了 8 代殖民过程中进化的可重复性。根据同一代或同一实验地点的种群中发生的共享等位基因频率变化的模式，我们发现适应性进化在殖民化的引入和建立阶段比在种群扩大范围的传播阶段更具可重复性。最后，通过研究保守位点等位基因频率的变化，我们找到了理论预测的证据，即范围扩展降低了清除有害等位基因的选择效率。总的来说，我们的结果增加了我们对殖民期间适应性进化的理解，证明进化可以高度重复，同时也表明随机性仍然发挥着重要作用。
How repeatable is evolution at genomic and phenotypic scales? We studied the repeatability of evolution during 8 generations of colonization using replicated microcosm experiments with the red flour beetle,Tribolium castaneum. Based on the patterns of shared allele frequency changes that occurred in populations from the same generation or experimental location, we found adaptive evolution to be more repeatable in the introduction and establishment phases of colonization than in the spread phase, when populations expand their range. Lastly, by studying changes in allele frequencies at conserved loci, we found evidence for the theoretical prediction that range expansion reduces the efficiency of selection to purge deleterious alleles. Overall, our results increase our understanding of adaptive evolution during colonization, demonstrating that evolution can be highly repeatable while also showing that stochasticity still plays an important role.