Pollinator shifts despite hybridisation in the Cape's hyperdiverse heathers (Erica, Ericaceae)

IF 4.5 1区 生物学 Q1 BIOCHEMISTRY & MOLECULAR BIOLOGY
Seth D. Musker, Michael D. Pirie, Nicolai M. Nürk
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引用次数: 0

Abstract

Interrogating the ecological and geographic factors that influence population divergence dynamics can reveal why some groups of organisms diversify more prolifically than others. One such group is the heathers (Erica, Ericaceae), the largest plant genus in the Cape Floristic Region. We study Erica abietina, a highly variable species complex with four subspecies differing in geographic range, habitat and pollination syndrome. We test for population differentiation, hybridisation, introgression and pollinator-driven divergence using genotyping-by-sequencing on samples across the entire distribution. We find five variably distinct genetic groups, with one subspecies comprising two independent lineages that are geographically isolated and occur on different soil types. Phylogenetic analysis suggests two independent shifts between bird and insect pollination, with accompanying genetic divergence. However, for one pair of populations with different pollinators, we uncover several individuals of hybrid origin at a site of sympatry. These results suggest that floral differentiation driven by divergent selection acts in concert with geographic isolation to maintain reproductive isolation and promote speciation. Our investigations reveal a highly dynamic system whose diversity has been shaped by a variety of interacting forces. We suggest that such a system could be a model for much of the diversification of the Cape flora.

Abstract Image

尽管开普省的红叶石楠(Erica, Ericaceae)品种繁多,但传粉者仍发生了杂交。
对影响种群分化动态的生态和地理因素进行研究,可以揭示为什么某些生物群体的分化比其他生物群体更多。开普花卉区最大的植物属红叶石楠(Erica,Ericaceae)就是这样一个群体。我们对 Erica abietina 进行了研究,这是一个高度多变的物种群,有四个亚种,它们在地理范围、栖息地和授粉综合征方面各不相同。我们通过对整个分布区的样本进行基因分型测序,检验了种群分化、杂交、引种和授粉者驱动的分化。我们发现了五个不同的基因组,其中一个亚种由两个独立的品系组成,这两个品系在地理上相互隔离,并出现在不同的土壤类型中。系统发育分析表明,鸟类和昆虫授粉之间有两次独立的转变,并伴随着基因分化。然而,在一对使用不同授粉者的种群中,我们在一个共生地点发现了几个杂交个体。这些结果表明,由分化选择驱动的花朵分化与地理隔离共同作用,维持了生殖隔离并促进了物种分化。我们的研究揭示了一个高度动态的系统,其多样性是由各种相互作用的力量形成的。我们认为,这种系统可以作为海角植物区系多样化的一个模型。
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来源期刊
Molecular Ecology
Molecular Ecology 生物-进化生物学
CiteScore
8.40
自引率
10.20%
发文量
472
审稿时长
1 months
期刊介绍: Molecular Ecology publishes papers that utilize molecular genetic techniques to address consequential questions in ecology, evolution, behaviour and conservation. Studies may employ neutral markers for inference about ecological and evolutionary processes or examine ecologically important genes and their products directly. We discourage papers that are primarily descriptive and are relevant only to the taxon being studied. Papers reporting on molecular marker development, molecular diagnostics, barcoding, or DNA taxonomy, or technical methods should be re-directed to our sister journal, Molecular Ecology Resources. Likewise, papers with a strongly applied focus should be submitted to Evolutionary Applications. Research areas of interest to Molecular Ecology include: * population structure and phylogeography * reproductive strategies * relatedness and kin selection * sex allocation * population genetic theory * analytical methods development * conservation genetics * speciation genetics * microbial biodiversity * evolutionary dynamics of QTLs * ecological interactions * molecular adaptation and environmental genomics * impact of genetically modified organisms
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