Abstract <p>Preserving the mutualistic network between plants and bees is crucial for maintaining biodiversity. However, urban environments are characterized by continuous ecological disturbances that can alter these relationships, sometimes irreversibly. To better understand how bee species are coping with urbanization, we analyzed their resource use in ten green spaces in Curitiba, Brazil. Bees were sampled monthly over ten months using entomological nets, and visited plants were collected for identification. We examined plant-bee interactions exploring how different bee species and their foraging behavior functional groups differ in the use of resources, by exploring species and network metrics. We also emphasized the role of exotic plants in these interactions. As expected, our findings revealed that oligolectic bees visited fewer plant species and showed stronger dietary preferences than polylectic ones. Despite being polylectic at the species level, stingless bees also displayed specialist behavior in the plant-bee network, exhibiting stronger dietary preferences than expected. When compared to available data, the bee assemblage exhibited fewer resource preferences than other pollinators, such as butterflies. Bees considered module and network hub species were characterized by being polylectic, social, and abundant, thus interacting with more plant species and helping the maintenance of the plant-bee web in the city. The network exhibited greater specialization and modularity, but lower nestedness than would be expected by chance. Although exotic plants greatly contributed to resource availability, no native bee species appeared to depend exclusively on them. This study improves understanding of bee resource use and lays groundwork for future urban ecology research.</p> Implications for insect conservation <p>Our findings reveal the importance of conserving diverse floral resources in urban landscapes to sustain pollinator communities. Although polylectic bees visited most of the plants, the oligolectics - often the genuine pollinators - were also relevant, visiting 40% of the species. Some polylectic species acted as hubs, indicating that they play a central role in maintaining the stability of plant–bee interactions in cities. Nevertheless, the persistence of oligolectic bees, which were shown to be more specialized, suggests that management strategies must also ensure the availability of their preferred host plants. Although native plants were able to sustain the bee assembly, as they interacted with nearly all bee species, the exotic plants likely contributed to the overall resource availability, as they interacted with half of the bees. No bee species appeared to rely exclusively on exotic flora, undermining its significance in sustaining the native bees.</p>