Bee communities net collected from California watermelon crop flowers

Wild bee communities were sampled at watermelon (Citrullus lanatus, cultivars Crimson Sweet and Yellow Baby) farms in the western USA. We netted all bees visiting crop flowers within a predefined 50- to 200-m2 transect. Netting was repeated in four ten-minute periods each sampling day. Specimens were identified to species using published taxonomic keys and assistance by expert taxonomists. Data collection methods are further described in Lemanski et al, 2022, Greater bee diversity is needed to maintain crop pollination over time, Nature Ecology and Evolution. Both files contain the same data, but the file "ca_wat_visits_corr.csv" is formatted for the main analysis in the manuscript, while the file "3years_wbees_oncrop.csv" is formatted for use in a null model analysis.