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Honeybees ( Apis mellifera ) can be exposed  via  numerous potential pathways to ambient nanoparticles (NPs), including rare earth oxide (REO) NPs that are increasingly used and released into the environment. Gut microorganisms are pivotal in mediating honeybee health, but how REO NPs may affect honeybee health and gut microbiota remains poorly understood. To address this knowledge gap, honeybees were fed pollen and sucrose syrup containing 0, 1, 10, 100, and 1000mgkg −1  of nano-La 2 O 3  for 12days. Nano-La 2 O 3  exerted detrimental effects on honeybee physiology, as reflected by dose-dependent adverse effects of nano-La 2 O 3  on survival, pollen consumption, and body weight ( p &amp;lt;0.05). Nano-La 2 O 3  caused the dysbiosis of honeybee gut bacterial communities, as evidenced by the change of gut bacterial community composition, the enrichment of pathogenic  Serratia  and  Frischella , and the alteration of digestion-related taxa  Bombella  ( p &amp;lt;0.05). There were significant correlations between honeybee physiological parameters and the relative abundances of pathogenic  Serratia  and  Frischella  ( p &amp;lt;0.05), underscoring linkages between honeybee health and gut bacterial communities. Taken together, this study demonstrates that nano-La 2 O 3  can cause detrimental effects on honeybee health, potentially by disordering gut bacterial communities. This study thus reveals a previously overlooked effect of nano-La 2 O 3  on the ecologically and economically important honeybee species  Apis mellifera .

Nano-La2O3 Induces Honeybee (Apis mellifera) Death and Enriches for Pathogens in Honeybee Gut Bacterial Communities