Funding for this research was provided by:
Received: 23 April 2020
Accepted: 23 September 2020
First Online: 6 October 2020
Ethics approval and consent to participate
: The sampling of plants and bees was approved and conducted in accordance with the regulations of the regional council (Regierungspräsidium) Stuttgart, Baden-Wuerttemberg, Germany (permit number/Aktenzeichen: plants 55-8841.06/14/UniUlmKuppler; bees 55-8850.68/14/UniUlm).
: Not applicable
: The authors declare that they have no competing interests.