Dietary titanium dioxide nanoparticles impair pollinator health: integrative analysis of colony performance, gut microbiota, and transcriptomic responses in Bombus terrestris.
Yuan YG, Smagghe G, Chen XS, Tian L, Long JK
Pollinator Health
PubMedThe bumblebees visiting your garden vegetables and wildflowers are being quietly poisoned by an ingredient in many agricultural sprays and everyday products, and fewer healthy bees means less fruit on your tomato plants and fewer seeds in your flower beds.
Researchers fed bumblebees tiny particles of titanium dioxide — a common ingredient in sunscreens, paints, and farm sprays — and found it made the bees sicker and less able to reproduce. The bees' gut bacteria were thrown into chaos and their bodies switched on emergency stress and immune responses. While the gut bacteria showed some ability to bounce back over two weeks, the damage to the colony — fewer workers surviving, slower egg-laying — persisted.
Key Findings
Bumblebee worker survival and food consumption dropped significantly after titanium dioxide nanoparticle ingestion at both realistic environmental doses and higher worst-case doses.
Gut microbiome dysbiosis was pronounced after just 3 days of exposure, with partial recovery toward normal profiles by day 15, suggesting limited microbial resilience.
Transcriptomic analysis revealed dose-dependent activation of immune, oxidative stress, calcium signaling, and programmed cell death pathways, with specific gut bacteria (Apibacter and Klebsiella) correlating with host gene expression changes.
chevron_right Technical Summary
A common pesticide ingredient — titanium dioxide nanoparticles found in many agricultural and consumer products — harms bumblebee colonies when ingested, disrupting gut bacteria, triggering immune stress responses, and reducing worker survival and egg development.
Abstract Preview
Titanium dioxide nanoparticles (TiO2 NPs) are widely used in industrial, agricultural, and consumer products and are increasingly detected in terrestrial and floral environments that are critical f...
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