Data for: Increasing aridity may threaten the maintenance of a plant defense polymorphism

It is unclear how environmental change influences standing genetic variation in wild populations. Here, we characterized environmental conditions that protect vs. erode polymorphic chemical defenses in Boechera stricta (Brassicaceae), a short-lived perennial wildflower. By manipulating drought and herbivory in a four-year field experiment, we measured the effects of driver variation on vital rates of genotypes varying in defense chemistry and then assessed interacting driver effects on total fitness (estimated as each genotype’s lineage growth rate, λ) using demographic models. Drought and herbivory interacted to shape vital rates, but contrasting defense genotypes had equivalent total fitness in many environments. Defense polymorphism thus may persist under a range of conditions; however, ambient field conditions fall close to the boundary of putatively polymorphic environment space, and increasing aridity may drive populations to monomorphism. Consequently, elevated intensity and/or f..., Data were collected by monitoring the survival, growth, and reproduction of experimental genotypes differing at a genetic locus controlling defense chemistry. These genotypes were transplanted into field conditions where we manipulated two putative drivers of natural selection on defense chemistry: drought and herbivory. We then process raw census data from the field to parameterize demographic models that integrate the effects of these two drivers on vital rates and total fitness for each genotype., , # Data for: Increasing aridity may threaten the maintenance of a plant defense polymorphism Corresponding author Lauren N. Carley: [[e-mail]](mailto:[e-mail]) ## STRUCTURE OF THIS ARCHIVE: Details on the purpose of each file in these folders, and their sub-directories, are provided below, following the general outline: ``` cfr-drought-herbivory-archive-R2/ README.txt 1-data/ 2-modelsel/ 3-ipm/ out_concat/ 4-analyses/ figures/ ``` ``` cfr-drought-herbivory-archive-R2/ ``` This directory contains all of the other subdirectories, which take you through data processing, modeling, and analysis step by step. It also contains one file: ``` README.txt ``` You are currently reading this text file. It explains all of the other files associated with this archive. ``` cfr-drought-herbivory-archive-R2/1-data/ ``` This folder contains data from the field transplant experiments described in this paper. It also contains one co...目前尚不明确环境变化如何影响野生种群的现存遗传变异（standing genetic variation）。本研究以短命多年生野生草本植物直立南芥（Boechera stricta，十字花科Brassicaceae）为研究对象，解析了能够维持与侵蚀其化学防御多态性（polymorphic chemical defenses）的环境条件。通过开展为期四年的田间实验操控干旱与植食作用（herbivory），我们测定了驱动因子变异对防御化学特征存在差异的基因型（genotypes）生命率参数（vital rates）的影响，并利用种群统计模型（demographic models）评估了驱动因子的交互效应对总适合度（total fitness）的作用——总适合度以各基因型的谱系生长速率（lineage growth rate, λ）进行估算。 干旱与植食作用共同塑造了生命率参数，但在多数环境中，不同防御基因型的总适合度并无显著差异。因此，化学防御多态性或可在一系列环境条件下得以维持；然而，当前的田间环境条件恰好接近推测的多态性环境空间边界，而干旱加剧可能会推动种群走向单态性。鉴于此，强度升高的……（原文内容截断）。 本研究通过监测在防御化学调控基因位点上存在差异的实验基因型的存活、生长与繁殖情况来收集数据。我们将这些基因型移栽至田间环境，并操控了两个调控防御化学的自然选择驱动因子：干旱与植食作用。随后，我们处理野外原始普查数据，以参数化种群统计模型，整合这两个驱动因子对各基因型的生命率参数与总适合度的影响。 # 数据对应：干旱加剧或威胁植物防御多态性的维持 通讯作者：Lauren N. Carley：[[e-mail]](mailto:[e-mail]) ## 本归档文件结构： 下文将按照通用框架，逐一说明各文件夹及其子目录中文件的用途： cfr-drought-herbivory-archive-R2/ README.txt 1-data/ 2-modelsel/ 3-ipm/ out_concat/ 4-analyses/ figures/ cfr-drought-herbivory-archive-R2/ 此目录包含所有其他子目录，可引导研究者逐步完成数据处理、模型构建与分析流程。此外该目录还包含一个文件： README.txt 您当前正在阅读的即为该文本文件，它将对本归档关联的所有其他文件进行详细说明。 cfr-drought-herbivory-archive-R2/1-data/ 该文件夹包含本研究论文中提及的野外移栽实验的相关数据。此外还包含一份共[原文内容截断]