A new study has revealed the intricate nutritional strategies employed by honeybees to ensure their young receive a balanced diet, alongside adapting their own diets in response to varying pollen quality. Researchers from the University of Oxford, collaborating with institutions across the globe, have demonstrated that bees can regulate their feeding habits when faced with nutrient-poor pollen sources.
The research, published in Current Biology, indicates that bees possess an inherent ability to adjust their feeding based on the amino acid profiles found in pollen sources. This is crucial, as essential amino acids are vital building blocks of protein that animals cannot produce internally and must acquire through their diet. Professor Geraldine Wright, lead author of the study from the University of Oxford's department of zoology, points out that pollen is often perceived as a perfect food source for bees but is primarily the male reproductive material of plants.
To investigate this, Professor Wright and her team compared the essential amino acid profiles of honeybee tissues with those found in 99 different British flowering plant species' pollen. They then conducted controlled laboratory experiments, feeding newly emerged worker honeybees artificial diets engineered to mimic either various pollen sources or their own tissue composition.
The findings showed that single pollen sources were largely a poor match for the bees' nutritional needs. Bees fed diets aligned with their own tissue composition consumed more food, gained greater body mass, and maintained a protein-rich dietary balance. The researchers suggest this response is linked to histidine, an essential amino acid required in small quantities by bees.
Crucially, the study also uncovered how honeybees ensure their young receive optimal nutrition. Analysis of 'bee bread', which is pollen gathered from multiple flowers and stored in the hive, showed a superior amino acid balance compared to individual pollen sources. The subsequent processing of bee bread by nurse bees, resulting in glandular secretions like royal jelly, further adapts the nutrient profile to match that of adult bees.
This research highlights the complex relationship between honeybees and their environment, as they adapt and compensate for nutritional deficiencies through sophisticated strategies. It underscores the importance of understanding these intricate interactions in order to develop effective conservation efforts for pollinators.