Eco-evolutionary dynamics of pollinator-driven diversification

我的实验室的研究重点是被子植物谱系，特别是那些受授粉影响的物种，在进化成功方面取得广泛成功的因素，以及它们为什么对当代生态系统的维持至关重要。在接下来的五年里，我的实验室将把系统发育比较方法与田间成分和适当的分子工具结合起来，研究授粉影响植物多样性的三个主要途径： 主题I植物谱系的范围扩大、性状进化和多样化： 我的实验室目前正在研究传粉者的射程变化和伴随的变化对植物物种形成的影响。我们将配对车前科多样性和范围的系统发育分析，以估计远距离扩散对鸟类授粉的影响。在更局部的范围内，我们正在调查适应新环境如何影响传粉者的组成和阿尔伯塔省落基山脉彭斯通物种内种群之间的基因流动。最后，在更广泛的范围内，我们正在将蜂鸟授粉进化的约130个属的群落生态学与历史生物地理学结合起来。我们将构建这些谱系的过时的系统发育史，以确定(1)传粉者的相似程度通常与这些不同支系成员的范围扩大相一致，以及(2)传粉者的专门化是否与多样化速率的变化有关。 主题二：性状保守性和不稳定性对植物多样性的影响： 潜在的性状基因组学影响着性状保守性的程度。我的实验室目前正在研究紫外光(UV)反射率的数量遗传学，这被认为是许多物种授粉成功的关键性状，使用点滴水母作为模式系统。这项研究将扩展到调查一个性状的潜在遗传结构如何影响它的进化速度。我们正在分析(1)一个性状的稳定选择程度是否与多样化比率有关，以及(2)一个性状所涉及的基因数量是否与进化速度有关。 主题III植物-传粉者生态系统遗传学、植物多样性和生态系统服务： 扩大我们之前在植物系统发育群落结构方面的工作，我的实验室将着手研究温带和热带地区的植物和传粉者的多样性。更高的连接性在较小的网络中观察到，并与更高的稳定性相关，这表明专家可能会破坏网络的稳定，并提供有限的生态系统服务。我们将构建整个网络中发现的植物和传粉者的系统发育图，根据种子集来衡量传粉者群落为植物群落提供的生态系统服务。对于这一提议，我们将比较温带和热带传粉者组成的周转(在贝塔多样性和叶位多样性方面)，并测试物种周转是否与专家对授粉的生态系统功能的总贡献有关。

Research in my lab maintains a focus on the factors responsible for the wide range in evolutionary success among angiosperm lineages, especially those influenced by pollination, and why they matter for the maintenance of contemporary ecosystems. Over the next five years, my lab will combine phylogenetic comparative approaches with field components and appropriate molecular tools to investigate three major avenues by which pollination influences plant diversification: Theme I Range expansion, trait evolution, and diversification of plant lineages: My lab is currently investigating the influence of range shifts and the accompanying shifts in pollinators on plant speciation. We will pair phylogenetic analyses of diversification and range in Plantaginaceae to estimate the influence of long-distance dispersal to bird pollination. At a more local scale, we are investigating how adaptation to new environments can affect pollinator composition and gene flow between populations within species of Penstemon in the Alberta Rockies. Finally, at a broader scale, we are integrating community ecology with historical biogeography in the ~130 genera where hummingbird pollination has evolved. We will construct dated phylogenies of these lineages to determine (1) what extent parallels in pollinators are commonly aligned with range expansion among members of these disparate clades and 2) whether pollinator specialization is associated with altered rates of diversification. Theme II The influence of trait conservatism and lability in plant diversification: The underlying genomics of traits influences the extent of trait conservatism. My lab is currently investigating the quantitative genetics of ultraviolet (UV) reflectance, a trait considered critical to the pollination success of many species, using Mimulus guttatus as a model system. This study will be extended to investigate how the underlying genetic architecture of a trait influences the rate at which it can evolve. We are conducting analyses of whether (1) the degree of stabilizing selection on a trait is associated with diversification rate and (2) whether the number of genes involved in a trait are associated with evolutionary rates. Theme III Plant-pollinator ecophylogenetics, phylobetadiversity, and ecosystem services: Expanding our previous work on plant phylogenetic community structure, my lab will embark on studies of plant and pollinator betadiversity in temperate and tropical locales. Higher connectance is observed in smaller networks and is associated with higher stability, indicating that specialists potentially destabilize networks and offer limited ecosystem service. We will construct phylogenies for plants and pollinators found throughout the networks, measuring the ecosystem service the pollinator community provides to the plant community in terms of seed set. Novel to this proposal, we will compare the turnover (in terms of betadiversity and phylobetadiversity) in pollinator composition in temperate versus tropical sites and test whether species turnover is associated with the summed contribution of specialists to the ecosystem function of pollination.