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Many  are  the  anthropogenic  drivers  of  pollinator  decline,  but  the  loss  of  suitable  habitats, among other effects caused by agricultural intensification, deserves special attention.  Reduction  in  the  availability  of  floral  resources  negatively  affects  bee communities, compromising bee species composition, foraging behavior, corporal size, and fitness. Our study aims to understand whether the presence of herbaceous plants, acting as foraging sites, next to crops contributes to bee species richness in smallholder rural properties. Bee sampling was performed on smallholder rural properties in the municipality of Guapiara, southern Sao Paulo state. Individuals who visited the flowers of ruderal plants and crops were collected, using an entomological net, for ten months. A total of 61 bee species were identified, with the highest species richness being sampled in ruderal plant flowers in the three properties studied. Only in one property, ruderal plants hosted a more diverse bee assemblage (Shannon-Weiner and taxonomic diversity indices), but species composition differed from that sampled in crop plants (Jaccard index) in all properties. Thirty-two species were sampled exclusively in ruderal plants, versus 9 only in crops and 20 species in both types of plants. Pollen analysis showed that of the 22 species of bees that were sampled only on flowers of ruderal plants, 9 species carried pollen of tomato and one species of bee carried pollen of kabocha squash. Ruderal plants can provide an alternative food resource for pollinators, enabling these insects to remain in or be attracted to crop areas, where, in addition to visiting such plants, they also visit the cultivated plant flowers. Allowing coexistence between crops and ruderal plants, provided that the issues of plant health are observed, is a simple and low-cost measure for farmers and will provide both economic and environmental benefits.

Ruderal Plants Providing Bees Diversity on Rural Properties