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Evaluating preservation effects on honeybee gut microbiota inocula
Kang Wang1, Zixuan Xu1, Jinmeng Ma1
1College of Animal Science and Technology, Yangzhou University, Yangzhou, China.
Microbiology Spectrum
|December 3, 2025
Summary
Preserving honeybee gut microbiota for research is possible with short-term storage. One day of refrigeration best maintains microbial communities, ensuring reliable colonization experiments and improving animal welfare for Apis mellifera studies.
Area of Science:
- Microbiology
- Insect Science
- Host-Microbe Interactions
Background:
- The honeybee (Apis mellifera) gut microbiota is crucial for host health and serves as a model for microbiome research.
- Germ-free bees allow for controlled colonization studies, but practical limitations exist for preparing fresh gut homogenates.
- Standardized microbial inocula are needed to improve reproducibility and animal welfare in bee microbiome research.
Purpose of the Study:
- To systematically evaluate the impact of short-term preservation methods on honeybee gut microbiota colonization efficiency and structural integrity.
- To determine optimal preservation conditions for gut homogenates used in germ-free bee colonization experiments.
- To provide methodological guidance for researchers studying honeybee gut microbial communities.
Main Methods:
- Honeybee gut homogenates were prepared and subjected to different preservation conditions: immediate use, refrigeration (1 and 3 days), and freezing (7 days with/without glycerol).
- Preserved homogenates were fed to germ-free bees, and colonization was assessed using absolute quantification of 16S rRNA gene copy numbers, diversity indices, and community composition analysis.
- Bacterial loads, taxon-specific responses, and community structure were compared across preservation treatments.
Main Results:
- All preservation methods allowed for the establishment of the characteristic honeybee core microbiota.
- Refrigeration for one day resulted in colonization outcomes statistically indistinguishable from fresh inocula.
- Longer refrigeration (3 days) and freezing treatments introduced measurable perturbations, affecting gut mass and specific taxa like Gilliamella.
Conclusions:
- Short-term preservation of honeybee gut microbiota is feasible, with one-day refrigeration being the optimal method for maintaining community integrity.
- Absolute quantification is essential for accurately assessing microbiome colonization and detecting subtle changes induced by preservation.
- These findings offer practical guidance for standardizing honeybee microbiota transplantation experiments, enhancing reproducibility and animal welfare.
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