Speciation in Heliconius Butterflies: Minimal Contact Followed by Millions of Generations of Hybridisation
Speciation in Heliconius Butterflies: Minimal Contact Followed by Millions of Generations of Hybridisation
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袖蝶的物种形成：最小的接触，随后是数百万代的杂交
DOI：
10.1101/015800
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
Martin S
中科院分区：
文献类型：
--
作者：
Martin S
记录物种形成过程中基因流动的全部范围是一个挑战，因为物种范围会随着时间的推移而变化，目前的杂交速度可能不能反映历史趋势。理论工作强调了面对正在进行的杂交时物种形成的潜力，以及可能促进这一过程的遗传机制。然而，事实证明，阐明物种之间的基因流动速度可能随着时间的推移而发生变化是困难的。在这里，我们使用近似贝叶斯计算(ABC)来拟合新热带蝴蝶Heliconius Melpomene和Heliconius cydno之间的物种形成模型。这些物种在生态上差异很大，很少杂交，表现为雌性杂交不育。然而，之前的基因组研究表明，它们之间普遍存在基因流动，深入到它们的过去，并可能贯穿物种形成过程。通过对物种形成早期和后期的基因流速度进行建模，我们发现这些物种已经杂交了数十万年，但自从最初的分歧以来并没有持续这样做。相反，在物种形成的早期阶段，基因流动似乎很罕见，甚至长达一百万年之久。因此，通过解剖这些物种之间的基因流动的时间，我们能够在面对持续的基因流动时拒绝纯粹共域物种形成的情景。我们认为，物种形成早期的最小接触时期可能允许基因组变化的积累，这些变化后来使这些物种保持独特，尽管杂交速度急剧增加。
Documenting the full extent of gene flow during speciation poses a challenge, as species ranges change over time and current rates of hybridisation might not reflect historical trends. Theoretical work has emphasized the potential for speciation in the face of ongoing hybridisation, and the genetic mechanisms that might facilitate this process. However, elucidating how the rate of gene flow between species may have changed over time has proved difficult. Here we use Approximate Bayesian Computation (ABC) to fit a model of speciation between the Neotropical butterfliesHeliconius melpomeneandHeliconius cydno. These species are ecologically divergent, rarely hybridize and display female hybrid sterility. Nevertheless, previous genomic studies suggests pervasive gene flow between them, extending deep into their past, and potentially throughout the speciation process. By modelling the rates of gene flow during early and later stages of speciation, we find that these species have been hybridising for hundreds of thousands of years, but have not done so continuously since their initial divergence. Instead, it appears that gene flow was rare or absent for as long as a million years in the early stages of speciation. Therefore, by dissecting the timing of gene flow between these species, we are able to reject a scenario of purely sympatric speciation in the face of continuous gene flow. We suggest that the period of minimal contact early in speciation may have allowed for the accumulation of genomic changes that later enabled these species to remain distinct despite a dramatic increase in the rate of hybridisation.
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DOI：
--
发表时间：
2012
期刊：
影响因子：
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作者：
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影响因子：
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作者：
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