Hybrid breakdown is elevated near the historical cores of a species' range
Hybrid breakdown is elevated near the historical cores of a species' range
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在物种分布范围的历史核心附近，杂交分解率较高
DOI：
10.1098/rspb.2022.0070
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
Busch, Jeremiah W.
中科院分区：
文献类型：
--
作者：
Koski, Matthew H.;Galloway, Laura F.;Busch, Jeremiah W.
当新物种在繁殖上被隔离时，它们就形成了。一个经典的物种形成模型假定，衍生突变出现在孤立的种群中，当在杂交种中结合时，会降低适应性。虽然这些Bateson-Dobzhansky-Muller不相容性是已知的，随着种群随时间的推移而分化，它们也可能反映种群内的常设遗传变异量。我们分析了F2杂种在24个种群的植物物种（美洲风铃草）之间的杂交的适应性与广泛的变化，在常设的遗传变异和遗传分化驱动的冰川期后的范围扩张。杂交故障变化很大，是最强的种群之间的物种范围内的遗传多样性很高的历史核心附近。近一半的混合故障的变化预测的综合效应的常设种群内的遗传变异，成对的遗传分化和他们居住的气候差异。混合故障之间的人口居住在不同的气候，可能反映了当地的适应增强。结果支持突变导致混合故障，物种形成的原料，更常见于长期居住的地区的物种范围。因此，庇护区的遗传多样性是物种形成过程中至关重要的不相容性的一个重要来源。
New species form when they become reproductively isolated. A classic model of speciation posits that derived mutations appear in isolated populations and reduce fitness when combined in hybrids. While these Bateson–Dobzhansky–Muller incompatibilities are known to accumulate as populations diverge over time, they may also reflect the amount of standing genetic variation within populations. We analysed the fitness of F2hybrids in crosses between 24 populations of a plant species (Campanula americana) with broad variation in standing genetic variation and genetic differentiation driven by post-glacial range expansions. Hybrid breakdown varied substantially and was strongest between populations near the historical cores of the species range where within-population genetic diversity was high. Nearly half of the variation in hybrid breakdown was predicted by the combined effects of standing genetic variation within populations, their pairwise genetic differentiation and differences in the climates they inhabit. Hybrid breakdown was enhanced between populations inhabiting distinct climates, likely reflecting local adaptation. Results support that the mutations causing hybrid breakdown, the raw material for speciation, are more common in long-inhabited areas of the species range. Genetic diversity harboured in refugial areas is thus an important source of incompatibilities critical to the speciation process.
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