Intraspecific plant chemodiversity at plot level has contrasting effects on arthropod functional groups

Plant chemistry mediates interactions between plants and their environment. While intraspecific chemodiversity at the individual plant level is well-studied, the effects of chemodiversity at the plant community level on arthropod interactions need more attention. We conducted a field experiment to test how intraspecific chemodiversity affects plant-arthropod interactions. We manipulated plots of Tanacetum vulgare L., varying in chemotype richness and composition, and monitored four arthropod functional groups (herbivores, flower visitors, predators, and ants) over three seasons. We hypothesized that higher plot-level chemotype richness would enhance occurrence across all studied arthropod groups but have functional group-specific effects on abundance, resulting in reduced herbivore and ant abundance and increased flower visitor and predator abundance with increased chemotype richness. Using mixed models, we found that increasing plot-level chemotype richness had a limited effect on most..., Data collection From 2021 to 2023, we assessed herbivores, flower visitors, predators, and ants. Each year, herbivore communities were monitored by counting individual aphids on the plants from their first appearance until nearly none were found. Although the focus was on aphids, other herbivores were scarce. Therefore, the generalization to herbivores here reflects predominantly aphids. Counts were conducted 13 times from June to August 2021, eight times from May to August 2022, and three times from June to August 2023. Each count, executed within a day between 7 h and 19 h, involved a meticulous scan of each plant, which started from the tip of each stem and proceeded to the end, examining both sides of each leaf. When multiple aphid species were present on a plant, we recorded the total number of each. In cases of high aphid densities (>100), we estimated the total by counting aphids on 1 cm of stem or 1 cm2 of leaf three times in different stems and leaves for each plant, then mu..., # README for: Increasing plant chemical diversity at plot level has contrasting effects on arthropod functional groups This README.txt file was generated on 20240613 by Lina Ojeda-Prieto ## GENERAL INFORMATION Raw data used for the following paper: Ojeda-Prieto et al. (2025). *Increasing plant chemical diversity at plot level has contrasting effects on arthropod functional groups* **Author Information** **Investigator Contact Information**\ Name: Lina Ojeda-Prieto\ Institution: Technical University of Munich\ Address: Hans-Carl-von-Carlowitz Platz 2. Freising, Germany\ Email: [[e-mail]](mailto:[e-mail]); [[e-mail]](mailto:[e-mail]) Date of data collection: 2021, 2022 ,and 2023\ Geographic location of data collection: Jena, Germany\ Data collected by Lina Ojeda-Prieto and Elicer L. Moreno --- ## DATA-SPECIFIC INFORMATION FOR: ### 1._Herbivores_2021.csv A. Number of variables: 28\ B. Number of cases/rows: 6552 C. Variable Li...,植物化学物质介导植物与其所处环境的相互作用。尽管针对个体植物层面的种内化学多样性（intraspecific chemodiversity）已有充分研究，但植物群落层面的化学多样性对节肢动物（arthropod）相互作用的影响仍有待更多关注。本研究开展野外实验，以探究种内化学多样性如何影响植物-节肢动物相互作用。我们对艾菊（Tanacetum vulgare L.）样地进行了操控处理，改变其化学型（chemotype）的丰富度与组成，并在三个生长季内监测了四类节肢动物功能群：植食性昆虫、访花者、捕食者以及蚂蚁。我们提出假说：样地水平的化学型丰富度提升将促进所有受试节肢动物类群的出现，但对丰度产生功能群特异性的影响——即随着化学型丰富度增加，植食性昆虫与蚂蚁的丰度会降低，而访花者与捕食者的丰度则会升高。通过混合效应模型（mixed models），我们发现提升样地水平的化学型丰富度对多数类群的影响有限…… ### 数据收集 2021年至2023年，本研究对植食性昆虫、访花者、捕食者及蚂蚁进行了调查。每年，我们通过计数植物上出现的蚜虫个体数量，从其首次出现直至几乎绝迹，以此监测植食性昆虫群落。尽管研究聚焦于蚜虫，但其他植食性昆虫较为稀少，因此本研究中所指的植食性昆虫群落主要以蚜虫为主。2021年6月至8月共开展13次计数，2022年5月至8月共8次，2023年6月至8月共3次。每次计数均在当日7时至19时之间完成，需细致扫描每株植物：从每根茎尖开始至茎末端，检查每片叶片的正反两面。若某株植物上存在多种蚜虫，我们会记录每种蚜虫的总数量。当蚜虫密度较高（>100头）时，我们通过在不同茎秆和叶片上计数1厘米茎段或1平方厘米叶片上的蚜虫数量，重复3次后估算该植株的总蚜虫数，…… # 数据集说明：提升样地水平的植物化学多样性对节肢动物功能群具有差异化影响 本README.txt文件由Lina Ojeda-Prieto于2024年6月13日生成。 ## 通用信息 本数据集对应以下论文的原始数据： Ojeda-Prieto等人（2025）.《提升样地水平的植物化学多样性对节肢动物功能群具有差异化影响》 **作者信息** **研究者联系方式** 姓名：Lina Ojeda-Prieto 所属机构：慕尼黑工业大学（Technical University of Munich） 通讯地址：德国弗赖辛市Hans-Carl-von-Carlowitz广场2号 电子邮箱：[e-mail]；[e-mail] 数据收集时间：2021年、2022年及2023年 数据采集地理区域：德国耶拿（Jena, Germany） 数据采集者：Lina Ojeda-Prieto与Elicer L. Moreno --- ## 数据集专项说明： ### 1. Herbivores_2021.csv A. 变量数量：28个 B. 样本/行数：6552条 C. 变量列表……