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Collaborative Research: LTREB: Feedbacks between evolution and demography in severely fragmented prairie populations of the purple coneflower, Echinacea angustifolia

合作研究：LTREB：严重分散的紫色金光菊、紫锥菊草原种群进化与人口统计学之间的反馈

基本信息

批准号：
1557075
负责人：
Stuart Wagenius
金额：
$ 25万
依托单位：
Chicago Horticultural Society
依托单位国家：
美国
项目类别：
Standard Grant
财政年份：
2016
资助国家：
美国
起止时间：
2016-04-01 至 2022-03-31
项目状态：
已结题

来源：
https://www.nsf.gov/awardsearch/showAward?AWD_ID=1557075&HistoricalAwards=false
关键词：
Collaborative Research LTREB Feedbacks between

项目摘要

This project will continue a long-term study of natural selection in the purple coneflower, Echinacea angustifolia. At the beginning of the 1800s, prairie covered a great swath of North America. Since then, about 99% of the tallgrass prairie has been destroyed. The small, isolated patches of prairie that remain harbor great biodiversity, yet rates of local plant extinctions are alarmingly high in remnant prairies. This project will advance scientific understanding of why some populations go extinct and others persist. Threats to prairie populations include fire suppression, declines of pollinators, inbreeding, loss of genetic diversity, and a reduced capacity to evolve by natural selection. This project builds on a long-term investigation of these ecological and genetic processes and feedbacks between them affecting a model prairie plant species. The purple coneflower typifies prairie plants in its long lifespan, often decades, and in other attributes. This study is the first of its kind to illustrate a population's capacity to adapt. In addition to advancing scientific knowledge and disseminating information to scientists and land stewards, this project will provide research experience and training to diverse participants at a level appropriate for their interests and career stage: high school, college, and graduate students, teachers, and citizen scientists in Minnesota and at the Chicago Botanic Garden.The project uses formal quantitative genetic approaches and common garden experimental designs to quantify additive genetic variance for fitness, population differentiation, and inbreeding depression. Researchers will estimate the amount of genetic variation in Darwinian fitness of individuals planted in 2003, many of which flowered for the first time in 2015 using aster statistical models to analyze fitness data. Other experiments will estimate the reduction in mean fitness due to mating between siblings. Together with demographic censuses of remnant populations, started in 1996, these studies will yield comprehensive assessments of population growth rates and the potential for evolutionary rescue. A key strength of the research is that experiments are conducted in a realistic habitat, including interactions of the coneflower with its pollinators and herbivores. The core datasets comprise continuous individual fitness records, including annual survival and reproduction of over 17,000 plants in ten experiments and in 27 natural prairie remnants in Minnesota. These datasets, which will extend up to 30 years by the end of the project, offer a rare window into the interplay of evolutionary and ecological processes of a long-lived species.

本计画将继续进行紫锥菊自然选择之长期研究。在19世纪初，大草原覆盖了北美的大片地区。从那时起，大约99%的高草草原被摧毁。小的、孤立的草原保留了丰富的生物多样性，然而在残留的草原上，当地植物的灭绝率高得惊人。该项目将促进科学理解为什么一些种群灭绝而另一些种群持续存在。对草原种群的威胁包括灭火、传粉媒介的减少、近亲繁殖、遗传多样性的丧失以及自然选择进化能力的降低。该项目建立在对这些生态和遗传过程以及它们之间影响草原植物物种的反馈的长期调查的基础上。紫色的松果花是草原植物的典型代表，其寿命长，往往几十年，并在其他属性。这项研究是第一次说明人口的适应能力。除了向科学家和土地管理员推广科学知识和传播信息外，该项目还将向不同参与者提供研究经验和培训，培训水平适合他们的兴趣和职业阶段：高中、大学、研究生、教师，以及明尼苏达州和芝加哥植物园的公民科学家。该项目使用正式的定量遗传方法和常见的花园实验设计量化适合度、群体分化和近交衰退的加性遗传方差。研究人员将估计2003年种植的个体的达尔文适应性的遗传变异量，其中许多在2015年首次开花，使用aster统计模型分析适应性数据。其他实验将估计由于兄弟姐妹之间的交配而导致的平均适应度的降低。这些研究将与1996年开始的残余人口的人口普查一起，对人口增长率和进化拯救的潜力进行全面评估。这项研究的一个关键优势是，实验是在一个现实的栖息地进行的，包括锥花与其传粉者和食草动物的相互作用。核心数据集包括连续的个体适应度记录，包括在10个实验和明尼苏达州27个自然草原遗迹中超过17，000种植物的年度生存和繁殖。这些数据集将在项目结束时延长至30年，为长寿物种的进化和生态过程的相互作用提供了一个难得的窗口。

项目成果

期刊论文数量（8）

专著数量（0）

科研奖励数量（0）

会议论文数量（0）

专利数量（0）

Fires slow population declines of a long-lived prairie plant through multiple vital rates

火灾通过多种生命率减缓了长寿草原植物的种群数量下降

DOI：
10.1007/s00442-021-04955-2
发表时间：
2021
期刊：
Oecologia
影响因子：
2.7
作者：
Nordstrom, Scott W.;Dykstra, Amy B.;Wagenius, Stuart
通讯作者：
Wagenius, Stuart

R code and data for “Offspring emergence, but not survival, increases with maternal mating opportunity"

R 代码和数据 – 后代出现率随母体交配机会增加，但存活率不增加"

DOI：
10.13020/b74k-7f48
发表时间：
2022
期刊：
Data Repository for the University of Minnesota (DRUM
影响因子：
0
作者：
Waananen, Amy;Richardson, Lea K.;Thoen, Riley D.;Nordstrom, Scott W.;Eichenberger, Erin G.;Kiefer, Gretel;Dykstra, Amy B.;Shaw, Ruth G.;Wagenius, Stuart
通讯作者：
Wagenius, Stuart

High juvenile mortality overwhelms benefits of mating potential for reproductive fitness

高幼体死亡率压倒了交配潜力对生殖健康的好处

DOI：
10.1086/730112
发表时间：
2024
期刊：
The American Naturalist
影响因子：
0
作者：
Waananen, Amy;Richardson, Lea K;Thoen, Riley D;Nordstrom, Scott W;Eichenberger, Erin G;Kiefer, Gretel;Dykstra, Amy B;Shaw, Ruth G;Wagenius, Stuart
通讯作者：
Wagenius, Stuart

Data and code: Habitat fragmentation decouples fire-stimulated flowering from plant reproductive fitness

数据和代码：生境破碎化将火刺激开花与植物繁殖适应性脱钩