Data from: Pollination biology and reproductive phenology of the federally endangered endemic Physaria globosa (Brassicaceae) in Tennessee

A study on the reproductive biology of the federally endangered Physaria globosa was conducted near Hartsville, TN, at one of the largest known populations of the species from February through July 2016. Objectives included (a) establishment of baseline reproductive phenology for P. globosa, (b) documentation of the diversity and frequency of floral visitors, and (c) determination of effective insect pollen vectors. Flowers were open for three days and displayed characteristics typical of outcrossing. Six insect species were identified as effective vectors for P. globosa pollen, including two dipterans and four halictid bees. While pollen loads were not significantly different among the vectors, floral visitors were ranked by frequency in descending order as follows: Nemotelus bruesii, Toxomerus geminatus, Lasioglossum illinoense, Halictus ligatus, Lasioglossum versatus, and Augochlorella striata. Information on natural history of this species is vital to aiding conservation efforts for P. globosa across its range.

2016年2月至7月，研究团队于田纳西州哈茨维尔附近该物种已知最大种群之一的分布区域，针对联邦濒危物种圆叶泡果荠（Physaria globosa）的生殖生物学开展了研究。本研究目标包括：(a) 建立圆叶泡果荠的生殖物候学基线；(b) 记录其访花昆虫的类群多样性与造访频率；(c) 确定有效的昆虫花粉传播媒介。该物种单花开放时长为三日，且具备异交植物的典型特征。研究共鉴定出6种可有效传播圆叶泡果荠花粉的昆虫媒介，其中包含2种双翅目昆虫与4种隧蜂科蜜蜂。尽管各传粉媒介携带的花粉负载量无显著差异，但访花昆虫按造访频率从高到低排序依次为：布鲁西氏扁角水虻（Nemotelus bruesii）、双斑食蚜蝇（Toxomerus geminatus）、伊利诺伊隧蜂（Lasioglossum illinoense）、淡脉隧蜂（Halictus ligatus）、杂色隧蜂（Lasioglossum versatus）以及条纹绿隧蜂（Augochlorella striata）。该物种的自然历史相关信息，对助力其分布范围内的保护工作至关重要。