Bees rely on floral pollen and nectar for food. Therefore, pollinator friendly plantings are often used to enrich habitats in bee conservation efforts. As part of these plantings, non‐native plants may provide valuable floral resources, but their effects on native bee communities have not been assessed in direct comparison with native pollinator friendly plantings. In this study, we performed a common garden experiment by seeding mixes of 20 native and 20 non‐native pollinator friendly plant species at separate neighboring plots at three sites in Maryland, USA, and recorded flower visitors for 2 years. A total of 3,744 bees (120 species) were collected. Bee abundance and species richness were either similar across plant types (midseason and for abundance also late season) or lower at native than at non‐native plots (early season and for richness also late season). The overall bee community composition differed significantly between native and non‐native plots, with 11 and 23 bee species being found exclusively at one plot type or the other, respectively. Additionally, some species were more abundant at native plant plots, while others were more abundant at non‐natives. Native plants hosted more specialized plant–bee visitation networks than non‐native plants. Three species out of the five most abundant bee species were more specialized when foraging on native plants than on non‐native plants. Overall, visitation networks were more specialized in the early season than in late seasons. Our findings suggest that non‐native plants can benefit native pollinators, but may alter foraging patterns, bee community assemblage, and bee–plant network structures.

中文翻译：

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本地和非本地授粉媒介对野生蜜蜂社区是否具有同等价值？

蜜蜂依靠花粉和花蜜获取食物。因此，在养蜂工作中，通常使用传粉媒介友好的种植来丰富栖息地。作为这些种植的一部分，非本地植物可能会提供宝贵的花卉资源，但尚未与直接授粉媒介友好种植进行直接比较，未评估其对本地蜜蜂群落的影响。在这项研究中，我们通过在美国马里兰州的三个地点的相邻邻近地块播种20种本地植物和20种非本地传粉媒介友好植物物种的混合物，进行了一项常见的花园实验，并记录了2年的花卉访客。总共收集了3744蜜蜂（120种）。蜜蜂的丰度和物种丰富度在不同的植物类型上都相似（季节中期，丰度也包括后期），或者在本地比非本地地块低（早期和丰度也包括后期）。本地小区和非本地小区的总体蜂群落组成差异很大，分别在一种或另一种小区类型中分别发现了11种和23种蜜蜂。此外，一些物种在本地植物园中更为丰富，而其他物种在非本地植物中更为丰富。与非本地植物相比，本地植物承载着更多的专业化植物-蜜蜂探访网络。在本地植物上觅食时，在五个最丰富的蜜蜂物种中，有三个物种比非本地植物更专业。总体而言，访问网络在早期季节比后期季节更为专业。