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To investigate whether flower selection in polylectic solitary bees is modulated by chemical imprinting to nest provisions, larvae of Osmia bicornis (L.) were reared on either Brassica napus L. (Brassicaceae) or Onobrychis viciifolia Scop. (Fabaceae). Flower preferences by adults were evaluated in multiple-choice behavioral tests based on visit number and duration, and flowers selected in the first...