Flowering phenology for seven California annual species under two rainfall treatments

Premise: Shifts in the timing of life history events, or phenology, have been recorded across many taxa and biomes in response to global change. These phenological changes are often studied in a single species context, but considering the community context is essential for anticipating the cascading effects on biotic interactions that are likely to occur. Focusing on an annual grassland plant community, we examined how experimental changes in precipitation affect flowering phenology in a community context and explore the implications of these shifts for competitive interactions and species coexistence.
Methods: We experimentally manipulated rainfall with rainout shelters and recorded detailed flowering phenology data for seven annual species including two grasses and five forbs. We assessed how their first and peak flowering days were affected by changes in rainfall and explored how flowering overlap between competing species changed.
Results: Changes in rainfall shifted flowering pheno..., The experiment was conducted at the University of California, Santa Barbara’s Sedgwick Reserve in Santa Barbara County, USA. Twenty 0.75m*0.75m plots were established and seeded in October 2019 in a fenced area designed to exclude deer and gophers, the two primary mammalian herbivores in the system. One hundred seeds of seventeen cooccuring annual grasses and forbs were mixed and hand sown in each plot. The plots were paired into ten blocks. Rain reduction shelters designed to divert 50% of incoming rain were placed over five of the blocks and therefore half of the plots on February 8, 2020. This timing allowed all plants to germinate and establish in late December and January with the same ambient rainfall conditions, resulting in the rainfall exclusion treatment impacting just the growth and reproduction phase of the plants’ life cycle. The seven most abundent species that germinated were tracked over the course of their lifetime. We used daily photographs from cameras mounted at each..., , # Flowering phenology for seven California annual species under two rainfall treatments

This is the data and analysis code for the manuscript entitled, \"Changes in flowering phenology with altered rainfall and the potential community impacts in an annual grassland.\" It includes the number of flowers visible for 7 annual plant species (5 forbs, 2 grasses), grown in mixed competition plots under two precipitation periods during the 2020 growing season.

Contact Mary Van Dyke ([[e-mail]](mailto:[e-mail])) with any questions. This manuscript has been accepted for publication in the American Journal of Botany (1/15/2025):
Van Dyke, M.N., N.J.B. Kraft. Changes in flowering phenology with altered rainfall and the potential community impacts in an annual grassland. American Journal of Botany (accepted).

There are three data files and three R scripts

Data files include:

## all\_species\_flower\_data.csv

This file contains the flowering phenology data for ...

前提：全球变化背景下，诸多类群与生物群区中均已记录到生活史事件的时序偏移，即物候（phenology）变化。这类物候变化的研究多局限于单一物种种群，但要预测其对生物交互可能产生的级联效应，必须纳入群落维度进行考量。本研究以一年生草本植物群落为研究对象，探究了人工调控降水对群落水平开花物候的影响，并揭示了此类物候偏移对物种间竞争交互与物种共存的潜在意义。
方法：本研究利用避雨棚（rainout shelters）开展降水调控实验，并针对7个一年生植物物种（含2种禾本科草本与5种杂类草（forbs））记录了精细的开花物候数据。我们评估了降水变化对物种初花期与盛花期的影响，并探究了竞争物种间的开花重叠度变化情况。
结果：降水变化可改变开花物候……本实验于美国加利福尼亚州圣巴巴拉县的加州大学圣巴巴拉分校塞奇威克保护区（University of California, Santa Barbara’s Sedgwick Reserve）开展。2019年10月，在一处用于排除系统内两种主要哺乳类植食动物——鹿与囊鼠的围栏区域内，设置了20个0.75m×0.75m的样方并进行播种。每个样方均混合播种17种同期共存的一年生草本与杂类草的各100粒种子，并将样方划分为10个区组。2020年2月8日，为5个区组（即半数样方）安装了可截留50% incoming降雨的减雨棚。该时间节点可确保所有植株在12月末与1月的自然降雨条件下完成萌发与定植，使得减雨处理仅作用于植物生命周期的生长与繁殖阶段。本研究对萌发后存活量最高的7个物种进行了全生命周期跟踪。我们利用安装在每个[原文截断]的相机每日拍摄的照片……
# 两种降水处理下7种加州一年生植物的开花物候
本数据集配套的研究论文题为《降水改变下的开花物候变化及一年生草本群落的潜在影响》，包含2020年生长季内，于混合竞争样方中种植的7个一年生植物物种（5种杂类草、2种禾本科草本）的可见花朵数量数据。
如有任何疑问，请联系玛丽·范戴克（Mary Van Dyke），邮箱：[e-mail]。本论文已于2025年1月15日被《美国植物学杂志》（American Journal of Botany）接收：
Van Dyke, M.N., N.J.B. Kraft. 降水改变下的开花物候变化及一年生草本群落的潜在影响. 美国植物学杂志（已接收）。
本数据集包含3个数据文件与3个R语言脚本：
数据文件包括：
## all_species_flower_data.csv
该文件包含[原文截断]的开花物候数据……