Evidence of recent and continuous speciation in a biodiversity hotspot: a population genetic approach in southern African gladioli (Gladiolus; Iridaceae)
Evidence of recent and continuous speciation in a biodiversity hotspot: a population genetic approach in southern African gladioli (Gladiolus; Iridaceae)
复制标题
生物多样性热点地区近期和持续物种形成的证据：南部非洲唐菖蒲（唐菖蒲；鸢尾科）的群体遗传方法
DOI：
10.1111/j.1365-294x.2010.04794.x
复制
发表时间：
2010
影响因子：
4.9
通讯作者：
V. Savolainen
中科院分区：
文献类型：
--
作者：
P. Rymer;J. Manning;P. Goldblatt;M. Powell;V. Savolainen
关于生物多样性热点地区物种多样性的起源，特别是物种形成超过灭绝的速度和物种形成的地理模式，一直存在很多争论。在这里，我们研究了一个生物多样性热点地区不同程度的物种形成，重点研究了非洲南部开普植物区一个独特的形态分支——剑兰carinatus物种群（鸢尾科）。我们通过结合生态学和基因组学的方法来研究涉及种群和物种分化的机制。我们估计了空间和物候重叠、花形态差异、遗传隔离和基因组选择。一项遗传学分析估计，谱系分化的时间是在这些物种目前在地理上重叠的开普滨海平原建立可用栖息地之后。在过去的30 - 140万年里，开花时间和形态的显著变化在不同程度上发展了起来，这是基因流动的障碍。扩增的片段长度多态性基因组扫描显示了发散和平衡选择的特征，尽管一半的位点始终表现中立。不同的物种异常值（1%）和花形态异常值（3%）只占基因组的一小部分，但这些位点产生了清晰的物种遗传簇，并与花性状有显著关联。这些结果表明，G. carinatus复合体代表了最近物种形成的连续体。我们为基因流的生态适应提供了进一步的证据。
There has been much debate over the origin of species diversity in biodiversity hotspots, particularly the rate of speciation over extinction and the geographic mode of speciation. Here, we looked at speciation with varying degrees of sympatry in a biodiversity hotspot, focusing on a distinct morphological clade in the Cape Floristic Region in southern Africa, the Gladiolus carinatus species complex (Iridaceae). We investigate the mechanisms involved in population and species differentiation through a combination of ecological and genomic approaches. We estimated spatial and phenological overlap, differences in floral morphology, genetic isolation and genomic selection. A genetic coalescent analysis estimated that the time of divergence between lineages followed the establishment of available habitat in the Cape littoral plain where these species currently overlap geographically. Marked shifts in flowering time and morphology, which act as barriers to gene flow, have developed to varying degrees over the last 0.3–1.4 million years. An amplified fragment length polymorphism genome scan revealed signatures of divergent and balancing selection, although half of the loci consistently behaved neutrally. Divergent species outliers (1%) and floral morph outliers (3%) represent a small proportion of the genome, but these loci produced clear genetic clusters of species and significant associations with floral traits. These results indicate that the G. carinatus complex represents a continuum of recent speciation. We provide further evidence for ecological adaptation in the face of gene flow.
影响因子：
10.7
作者：
Hey, Jody
通讯作者：
Hey, Jody
染色体分化的向日葵物种之间适应性分歧的基因组模式。
影响因子：
10.7
作者：
Strasburg,JaredL;Scotti-Saintagne,Caroline;Scotti,Ivan;Lai,Zhao;Rieseberg,LorenH
通讯作者：
Rieseberg,LorenH
使用多位点基因型数据推断群体结构：连锁位点和相关等位基因频率。
影响因子：
3.3
作者：
Falush,Daniel;Stephens,Matthew;Pritchard,JonathanK
通讯作者：
Pritchard,JonathanK