Adaptive zones shape the magnitude of premating reproductive isolation in Timema stick insects
Adaptive zones shape the magnitude of premating reproductive isolation in Timema stick insects
复制标题
适应区决定了蒂玛竹节虫交配前生殖隔离的程度
DOI：
10.1098/rstb.2019.0541
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发表时间：
2020
期刊：
影响因子：
--
通讯作者：
P. Nosil
中科院分区：
文献类型：
--
作者：
Moritz Muschick;V. Soria;J. Feder;Z. Gompert;P. Nosil
辛普森的化石记录启发的“适应区”模型提出，进化是由适应区内的小波动主导的，偶尔会被区域之间的较大变化打断。这个模型可以解释为什么种群分化过程中往往导致弱或中度的生殖隔离（RI），而不是强RI和不同的物种。应用到物种形成过程中，适应区假说做出了两个相互关联的预测：（i）区域之间的大的变化是相对罕见的，（ii）当大的变化确实发生时，它们会产生比区域内的变化更强的RI。在这里，我们使用生态，系统发育和行为的数据来测试这些预测在Timema棒昆虫。我们表明，主机使用在Timema是占主导地位的温和的变化内的系统划分的开花植物和针叶树，只有少数极端的变化之间的这些部门。然而，当发生极端变化时，它们产生的RI比更温和的变化更大。我们的研究结果支持的适应区模型，并建议，生态变化多样化的净贡献是依赖于它们的幅度和频率。我们讨论的一般性，我们的研究结果中出现的证据，从不同的类群，RI的演变并不总是决定物种多样性的起源的唯一因素。这篇文章是“走向物种形成的完成：超越第一个障碍的生殖隔离的进化”主题的一部分。
Simpson's fossil-record inspired model of ‘adaptive zones’ proposes that evolution is dominated by small fluctuations within adaptive zones, occasionally punctuated by larger shifts between zones. This model can help explain why the process of population divergence often results in weak or moderate reproductive isolation (RI), rather than strong RI and distinct species. Applied to the speciation process, the adaptive zones hypothesis makes two inter-related predictions: (i) large shifts between zones are relatively rare, (ii) when large shifts do occur they generate stronger RI than shifts within zones. Here, we use ecological, phylogenetic and behavioural data to test these predictions in Timema stick insects. We show that host use in Timema is dominated by moderate shifts within the systematic divisions of flowering plants and conifers, with only a few extreme shifts between these divisions. However, when extreme shifts occur, they generate greater RI than do more moderate shifts. Our results support the adaptive zones model, and suggest that the net contribution of ecological shifts to diversification is dependent on both their magnitude and frequency. We discuss the generality of our findings in the light of emerging evidence from diverse taxa that the evolution of RI is not always the only factor determining the origin of species diversity. This article is part of the theme issue ‘Towards the completion of speciation: the evolution of reproductive isolation beyond the first barriers’.
影响因子：
16.8
作者：
Nosil, Patrik;Feder, Jeffrey L.;Gompert, Zachariah
通讯作者：
Gompert, Zachariah