Bee communities net collected from New Jersey watermelon crop flowers

Wild bee communities were sampled at watermelon (<em>Citrullus lanatus</em>) farms in the eastern USA. We netted all bees visiting crop flowers within a predefined 50- to 200-m² transect. Netting was repeated in three 20-minute periods each sampling day. Specimens were identified to species using published taxonomic keys and assistance by expert taxonomists. <br> Data collection methods are further described in Lemanski et al, 2022, Greater bee diversity is needed to maintain crop pollination over time, Nature Ecology and Evolution. <br> Both files contain the same data, but the file "watermelon_visit_table.csv" is formatted for the main analysis in the manuscript, while the file "njwat_obs.csv" is formatted for use in a null model analysis. <br>

本研究在美国东部的西瓜（<em>Citrullus lanatus</em>）农田中开展野生蜂类群落采样。研究人员在预设的50~200平方米样带内，以网捕法采集所有造访作物花朵的蜂类个体。每个采样日内重复进行三次20分钟的网捕作业。标本依据已发表的分类检索表，并在分类学专家的协助下鉴定至物种水平。<br>数据采集方法的详细说明可参见Lemanski等（2022）发表于《自然·生态与进化（Nature Ecology and Evolution）》的论文《长期维持作物授粉需提升蜂类多样性（Greater bee diversity is needed to maintain crop pollination over time）》。<br>两个文件包含完全相同的数据，其中`watermelon_visit_table.csv`的格式适配论文手稿的主分析需求，而`njwat_obs.csv`的格式则用于零模型分析。