Bee communities net collected from California watermelon crop flowers

Wild bee communities were sampled at watermelon (<em>Citrullus lanatus, </em>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. <br> 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. <br> 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.