Dose-dependent effects of antibiotic intake on Bombus Terrestris (Linnaeus, 1758) dietary intake, survival and parasite infection prevalence

•Test of how field-realistic antibiotic doses affect Bombus terrestris.•Rising antibiotic doses reduced food intake and survival.•Dose-dependent increase in vulnerability to gut parasite Crithidia bombi.•Dose-dependent lethal and sub-lethal effects of antibiotics on B. terrestris.•Antibiotic induced gut dysbiosis could alter parasite dynamics.