Populations of managed pollinators are often introduced in agricultural fields to increase pollination levels. Ideally, managed pollinators should show a strong affinity for the target crop, which depends on innate preferences, but also on the availability of alternative co-blooming flower resources. In this study we compared pollen collection in Osmia cornuta and Bombus terrestris populations introduced in orchards, and we analysed how it is affected by local and landscape floral context. Based on pollen preferences and foraging rates of the two species, we expected O. cornuta to collect more fruit tree pollen than B. terrestris and to be less influenced by landscape factors. We sampled 16 orchards of various fruit tree species (almonds, apricots, cherries, apples). In each orchard, we characterized local flower availability and landscape composition, and identified pollen samples from 20 to 30 individuals of each pollinator species. O. cornuta collected a greater proportion of fruit tree pollen than B. terrestris (92% vs 81%), irrespective of the availability of alternative flower resources at the local and landscape levels. The diversity of pollen collected by B. terrestris increased with the availability of alternative flower resources, both at the local and landscape levels, suggesting that some of the foraging by this species took place away from the target orchard. Our results demonstrate that wild flowers do not compete with fruit tree flowers for O. cornuta visitation. Therefore, the use of managed O. cornuta populations to supplement pollination services in orchards is compatible with the implementation of agri-environmental measures (flower strips, ecological focus areas) to promote wild pollinator communities.

受管理的授粉媒介种群通常被引入农田以提高授粉水平。理想情况下，受管理的传粉者应该对目标作物表现出很强的亲和力，这取决于先天偏好，但也取决于替代的共同开花花卉资源的可用性。在这项研究中，我们比较了在果园中引入的角壁蜂和熊蜂种​​群的花粉采集，并分析了它如何受到当地和景观花卉环境的影响。根据这两个物种的花粉偏好和觅食率，我们预计O. cornuta比B. terrestris收集更多的果树花粉受景观因素的影响较小。我们对 16 个不同果树品种（杏仁、杏子、樱桃、苹果）的果园进行了采样。在每个果园中，我们对当地花卉可用性和景观构成进行了表征，并从每个传粉者物种的 20 到 30 个个体中鉴定了花粉样本。O. cornuta收集了比B. terrestris更大比例的果树花粉（92% 对 81%），无论在当地和景观层面是否有替代花卉资源。B. terrestris采集的花粉多样性随着当地和景观层面的替代花卉资源的可用性而增加，表明该物种的一些觅食发生在远离目标果园的地方。我们的结果表明，野花不会与果树花竞争O. cornuta的访问。因此，使用管理的O. cornuta种群来补充果园中的授粉服务与实施农业环境措施（花带、生态重点区域）以促进野生传粉媒介群落是相容的。