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The velocity of evolutionary responses of species to ecological change; testing adaptive limits in time and space

物种对生态变化的进化反应速度；

基本信息

批准号：
NE/N015711/1
负责人：
Ilik Saccheri
金额：
$ 59.2万
依托单位：
University of Liverpool
依托单位国家：
英国
项目类别：
Research Grant
财政年份：
2016
资助国家：
英国
起止时间：
2016 至无数据
项目状态：
已结题

来源：
https://gtr.ukri.org/projects?ref=NE%2FN015711%2F1
关键词：
velocity evolutionary responses species ecological

项目摘要

Climate change is causing the populations of some species to increase, some to remain relatively stable, and others to decline, even when the species co-exist and might be expected to exhibit comparable ecological responses (e.g., some southern species have expanded their ranges northwards, whereas others have retreated). This diversity of responses to climate change may reflect differences in their capacities to undertake evolutionary and plastic responses that determine success or failure. However, multi-species studies of historical evolutionary responses to environmental change are lacking. In the proposed research, we will use: (1) analyses of historical and present-day DNA from 30 species (10 declining, 10 stable and 10 expanding) to identify the commonality or diversity of adaptive responses to anthropogenic climate change; (2) experimental studies to tease apart plastic, epigenetic and evolutionary responses in a focal species; and (3) modelling to evaluate the contributions of evolutionary, epigenetic and plastic changes to the responses of British Lepidoptera to past and future climatic changes. Moths and butterflies represent an ideal study group because extensive datasets allow us to document the ecological (population abundance, distribution change) and plastic (phenology) responses of species to climate change over the past four decades with a precision not possible for other taxa. Their annual (or faster) generations permit rapid evolutionary change as well as plastic responses to within- and between-year variation in climatic conditions. Museum collections will enable us to assess historical levels of genetic variation within our study species prior to 20th century anthropogenic climate change. We will take advantage of recent advances in sequencing technology to quantify ancestral genetic variation in our study species, and compare this with current genomic diversity to enumerate genetic changes taking place in declining, stable and increasing species, and specifically to evaluate whether species with higher levels of genetic variation show greater ability to adapt to climate change. We will complement this multi-species analysis by evaluating the capacity of expanding, stable and declining populations of one focal species, Pararge aegeria (Speckled wood butterfly) to exhibit evolutionary change, phenotypic plasticity and epigenetic effects using experiments in which we manipulate environmental conditions during larval development (temperature, photoperiod and host-plant desiccation). These experiments will reveal if there are environmental thresholds beyond which adaptive plasticity fails, and the potential for plasticity to evolve and buffer species under future environments. We will then use dynamic simulation models that incorporate our empirical data to test the relative importance of phenotypic plasticity, epigenetic effects, and evolutionary responses in determining species' responses to climate change, and how the relative importance of these factors varies among different species and population types. Once calibrated, we can then use our models to project the responses of these species to future climate change, based on observed limits to adaptation and plasticity. Distinguishing the key factors (ecological, demographic, and genomic) that determine species' responses to environmental change, and how these depend on evolutionary responses, will allow us to identify potential conservation strategies to facilitate population persistence and growth in the face of ongoing climate change.

气候变化正在导致一些物种的数量增加，一些物种保持相对稳定，而另一些物种数量减少，即使这些物种共存并可能表现出类似的生态反应（例如，一些南方物种向北扩大了它们的活动范围，而另一些物种则退缩了）。这种应对气候变化的多样性可能反映了它们采取决定成败的进化和塑性应对能力的差异。然而，多物种对环境变化的历史进化反应的研究还很缺乏。在本研究中，我们将使用：(1)分析来自30个物种（10个下降，10个稳定和10个扩展）的历史和现代DNA，以确定对人为气候变化的适应性响应的共性或多样性；(2)通过实验研究梳理焦点物种的可塑性、表观遗传和进化反应；(3)建立模型，评估进化、表观遗传和塑性变化对英国鳞翅目对过去和未来气候变化的响应的贡献。飞蛾和蝴蝶是一个理想的研究群体，因为广泛的数据集使我们能够记录过去四十年来物种对气候变化的生态（种群丰度，分布变化）和塑料（物候）反应，其精度是其他分类群无法做到的。它们的年度（或更快）世代允许快速的进化变化以及对年内和年间气候条件变化的可塑性反应。博物馆的收藏将使我们能够评估我们研究物种在20世纪人为气候变化之前的遗传变异的历史水平。我们将利用最新的测序技术来量化我们研究物种的祖先遗传变异，并将其与当前的基因组多样性进行比较，以列举在下降、稳定和增加的物种中发生的遗传变化，特别是评估遗传变异水平较高的物种是否表现出更强的适应气候变化的能力。我们将利用控制幼虫发育过程中的环境条件（温度、光周期和寄主植物干燥）的实验，通过评估一个焦点物种Pararge aegeria（斑点木蝴蝶）种群扩张、稳定和下降的能力来补充这种多物种分析。这些实验将揭示是否存在超过适应性可塑性失效的环境阈值，以及可塑性在未来环境中进化和缓冲物种的潜力。然后，我们将使用结合我们的经验数据的动态模拟模型来测试表型可塑性、表观遗传效应和进化反应在决定物种对气候变化的反应中的相对重要性，以及这些因素在不同物种和种群类型之间的相对重要性如何变化。一旦校准，我们就可以使用我们的模型来预测这些物种对未来气候变化的反应，基于观察到的适应和可塑性的限制。区分决定物种对环境变化的反应的关键因素（生态、人口统计学和基因组学），以及这些因素如何依赖于进化反应，将使我们能够确定潜在的保护策略，以促进种群在面对持续气候变化时的持续和增长。