Bee-genius! How honeybees mirror clever symmetry to beat heat in their hives

Bee-genius! How honeybees mirror clever symmetry to beat heat in their hives

A study led by researchers at Auburn University’s Smith Bee Lab has uncovered a unique example of internal symmetry within nature: honeybees exhibit mirror-like symmetry in the contents of their nests.

This remarkable internal organization, observed across multiple honeybee species, means that what bees store on one side of a honeycomb is replicated on the opposite side.

Their findings suggest that honeybees universally organize their nests this way, likely due to evolutionary advantages linked to both storage efficiency and temperature regulation.

Indirect cues make symmetry

Humans have long observed the honeycomb’s classic double-sided structure, known for its wax-conserving hexagonal cells. This dual-sided design was assumed to primarily help bees minimize wax usage, as wax production is resource-intensive.

But this new study reveals that the contents within each comb side also reflect each other. Whether it’s honey, pollen, or brood cells, each element appears in mirrored locations on both sides of the comb, forming an organized, balanced system throughout the colony’s lifecycle.

To explore this phenomenon in detail, the researchers placed honeybee colonies in transparent observation hives, allowing them to study nest construction without disturbing the bees. Over time, they captured 148 detailed nest maps from six colonies, confirming that each nest cell had a matching counterpart on the opposite side of the comb.

To determine if bees needed direct access to both sides of the comb to achieve this symmetry, the team designed a special hive with an impermeable base, allowing independent colonies to build nests without interacting. Surprisingly, even without contact, the two colonies mirrored each other’s nest arrangements. This led the researchers to hypothesize that indirect cues, such as heat, could guide this coordination.

Since bees are highly sensitive to nest temperature—a critical factor for brood development—the researchers tested this by placing heat pads at random spots on one side of the hive, set to broodnest temperatures. When they returned after ten days, they found that each colony had aligned its brood cells perfectly with the heat pad location, reinforcing the idea that temperature cues play a significant role in honeybee nest organization.

A trait common across honeybee species

Claire Bailey, a co-author and former Auburn undergraduate, explained that the consistency of the brood pattern was striking, essentially mapping out a heat-aligned blueprint across the comb.

The team further explored whether this symmetry provided measurable benefits to the colony. By comparing one-sided and two-sided nests, they observed that colonies with symmetrical nests produced nearly 60% more brood after ten days than their one-sided counterparts. Additionally, symmetrical nests displayed more stable temperatures, an advantage for maintaining the optimal environment required for brood development.

To validate their findings, the researchers also investigated if this organizational symmetry was unique to domesticated bees or if it appeared in wild honeybee species. Collaborating with Dr. Ben Koger at the University of Wyoming, they employed advanced image-analysis techniques to classify comb contents in naturally built, three-dimensional nests. Consistently, they found the same pattern of internal symmetry in natural nests.

Seeking further confirmation, the team turned to honeybee species in Thailand, where Dr. Bajaree Chuttong provided images of nests from three other honeybee species: Apis andreniformis, Apis dorsata, and Apis florea. All displayed similar mirror symmetry in their nest organization, affirming that this trait is a fundamental aspect of honeybee nest architecture.

This study sheds light on how symmetry extends beyond external appearances, revealing a novel function in nest thermoregulation and storage organization among honeybees.

Source: Interesting Engineering

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Bee-genius! How honeybees mirror clever symmetry to beat heat in their hives/Bee-genius! How honeybees mirror clever symmetry to beat heat in their hives