Multiple parapatric pollinators have radiated across a continental fig tree displaying clinal genetic variation
Multiple parapatric pollinators have radiated across a continental fig tree displaying clinal genetic variation
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多个近亲传粉者已经辐射到一棵大陆无花果树上，显示出临床遗传变异
DOI：
10.1111/mec.15046
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发表时间：
2019-05-01
影响因子：
4.9
通讯作者：
Kjellberg, Finn
中科院分区：
文献类型：
--
作者：
Yu, Hui;Tian, Enwei;Kjellberg, Finn
植物喂养昆虫多样化的方式对于我们对陆地生态系统的理解至关重要。强大的托儿所授粉互助主义提供了高度相关的模型系统，这些模型系统是如何多样化的植物及其昆虫同事的多样性的，而无花果树（FICUS）超过800种允许比较研究。无花果树可以在无花果中繁殖的一种或多种授粉无花果黄蜂（Agaonidae），但影响其数量的因素仍有待确定。在一些分布广泛的无花果树中，植物形成了由大量海洋分离的种群，不同的种群被不同的黄蜂物种授粉。其他具有连续分布的紫菜物种可能会通过距离呈现分离的遗传特征，这表明授粉媒介分散剂有限，这也可能促进传粉媒介的形成。我们检验了以下假设：ficus hirta的初步数据显示了逐距离遗传隔离的物种，它将支持其范围内的许多授粉媒介物种。我们的结果表明，在其范围内，hirta显示了clinal遗传变异，并由瓦利西亚的九种属性物种进行了授粉。这是迄今为止对任何ficus物种报告的最多的传粉媒介数量，它是无花果寄主物种在显示连续遗传结构的无花果宿主上出现的首次证明。跨紫菜物种的未来比较研究应该能够建立促进传粉媒介分散行为，授粉媒介物种和宿主植物空间遗传结构的演变的植物特征。
The ways that plant-feeding insects have diversified are central to our understanding of terrestrial ecosystems. Obligate nursery pollination mutualisms provide highly relevant model systems of how plants and their insect associates have diversified and the over 800 species of fig trees (Ficus) allow comparative studies. Fig trees can have one or more pollinating fig wasp species (Agaonidae) that breed within their figs, but factors influencing their number remain to be established. In some widely distributed fig trees, the plants form populations isolated by large swathes of sea, and the different populations are pollinated by different wasp species. Other Ficus species with continuous distributions may present genetic signatures of isolation by distance, suggesting more limited pollinator dispersal, which may also facilitate pollinator speciation. We tested the hypothesis that Ficus hirta, a species for which preliminary data showed genetic isolation by distance, would support numerous pollinator species across its range. Our results show that across its range F. hirta displays clinal genetic variation and is pollinated by nine parapatric species of Valisia. This is the highest number of pollinators reported to date for any Ficus species, and it is the first demonstration of the occurrence of parapatric pollinator species on a fig host displaying continuous genetic structure. Future comparative studies across Ficus species should be able to establish the plant traits that have driven the evolution of pollinator dispersal behaviour, pollinator speciation and host plant spatial genetic structure.