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Daily Read: Wildlife

Honey Bee Hives Act Like Immune Systems

Researchers from the University of Sydney have shown that honey bee colonies use a coordinated chemical defense system that functions like an immune system. By sampling 24 colonies across five New South Wales apiaries, they mapped bacterial and fungal communities and tested the antimicrobial properties of hive materials such as honey, propolis, pollen, and wax. The study found that different hive zones employ distinct antimicrobial strategies: honey relies on hydrogen peroxide, propolis on flavonoids, and pollen on fermentation acids. Importantly, the potency of these defenses depends more on the surrounding landscape than on the colony’s disease history. Colonies foraging in diverse, flowering habitats had a broader chemical toolkit than those in monoculture landscapes. The researchers suggest that preserving diverse plant communities around apiaries could strengthen bee health and resilience to pathogens. The findings may also apply to other social insects that gather antimicrobial compounds from their environment. The paper, published in ISME Communications, highlights the role of ecological complexity in disease resistance for pollinators.

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The essential points

  1. 01Honey bee colonies deploy zone‑specific antimicrobials: hydrogen peroxide in honey, flavonoids in propolis, fermentation acids in pollen.
  2. 02The strength of these defenses is linked to the diversity of nearby flowering plants rather than the hive’s disease history.
  3. 03Colonies in diverse landscapes possess a broader chemical toolkit, boosting their ability to control harmful microbes.
  4. 04Maintaining diverse plant communities around apiaries could be a practical strategy to enhance pollinator health and disease resistance.
The full brief

Researchers from the University of Sydney have shown that honey bee colonies use a coordinated chemical defense system that functions like an immune system. By sampling 24 colonies across five New South Wales apiaries, they mapped bacterial and fungal communities and tested the antimicrobial properties of hive materials such as honey, propolis, pollen, and wax. The study found that different hive zones employ distinct antimicrobial strategies: honey relies on hydrogen peroxide, propolis on flavonoids, and pollen on fermentation acids.

Importantly, the potency of these defenses depends more on the surrounding landscape than on the colony’s disease history. Colonies foraging in diverse, flowering habitats had a broader chemical toolkit than those in monoculture landscapes. The researchers suggest that preserving diverse plant communities around apiaries could strengthen bee health and resilience to pathogens.

The findings may also apply to other social insects that gather antimicrobial compounds from their environment. The paper, published in ISME Communications, highlights the role of ecological complexity in disease resistance for pollinators.