A marked, mated, and laying queen. (Photo: Kate Anton/Penn State)
Inside what appears to be a peaceful honey bee colony, a quiet biological drama unfolds. The queen—the singular figure that anchors the entire hive—turns out to be far more fragile than her title suggests. Her power does not rest on physical dominance, but on scent. As long as her pheromones remain strong, workers remain loyal and attentive. But once that chemical signal weakens, the colony makes a cold, decisive choice: the queen must be replaced.
This intricate power dynamic is the focus of a recent study titled “Elevated virus infection of honey bee queens reduces methyl oleate production and destabilizes colony-level social structure”, published in Proceedings of the National Academy of Sciences (PNAS) in October 2025. Led by honey bee biologist Alison McAfee of the University of British Columbia, the study provides the clearest evidence yet of how viral infection, physiological damage, and pheromone disruption combine to trigger supersedure—the colony’s method of replacing its queen.
Beneath the seemingly effortless rule of a queen lies an array of internal functions working constantly to maintain her authority. Fully developed ovaries, abundant energy reserves, and steady pheromone production are the foundation of her leadership. These pheromones, including methyl oleate, act as invisible messages, signaling to workers that the queen is healthy and capable. But when viruses infiltrate the queen’s body, that foundation begins to crumble.
Pheromone Decline
McAfee’s team experimentally infected queens with common bee pathogens, including Deformed Wing Virus and Black Queen Cell Virus. The results were striking. Infected queens showed visibly reduced ovary size and sharply decreased levels of triacylglycerides, the energy reserves essential for metabolism and reproduction. More importantly, methyl oleate production dropped significantly. In the world of bees, this chemical is a core indicator of queen viability. Without it, the queen’s presence begins to fade—not physically, but socially.
Researchers observed subtle but telling changes among worker bees. They became restless, inspecting areas of the hive where queen cells are typically built. These behaviors seem routine to the untrained eye, but for bee biologists, they are unmistakable signs: the colony is preparing for a leadership transition.
According to McAfee, a decline in pheromones is not just a symptom—it is a signal. “Pheromones are the queen’s language,” she explained. “When that chemical language weakens or disappears, the colony interprets it as a failure of leadership. They don’t wait for the queen to die. They respond immediately, because the colony’s survival depends on it.” Her comment reframes the hive as a highly sensitive social system, one that responds rapidly to internal instability.
Fooled Queen Bee
Intriguingly, the study also shows that infection is not the only cause of pheromone decline. When queens temporarily stop laying eggs, or experience physiological stress, methyl oleate levels can drop even without viral infection. In experiments where oviposition was deliberately restricted, pheromone output still fell. This indicates that ovary health and reproductive activity are intimately connected to pheromone production—and therefore to the queen’s perceived legitimacy.
To test whether colonies could be “fooled,” researchers introduced synthetic pheromones, including laboratory-made methyl oleate, into several hives. The results were dramatic, colonies appeared calmer, and supersedure rates fell. The workers behaved as though the queen were still healthy. Yet McAfee warns that this is not a sustainable solution. “Synthetic pheromones only buy time,” she said. “The underlying problem—viral damage or physiological decline—remains. The colony will eventually detect the truth.”
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For beekeepers, the study provides a crucial piece of understanding about sudden queen failure, a problem that destabilizes honey production and weakens colonies worldwide. Knowing that viral infections can chemically silence a queen gives new direction for managing Varroa destructor mites, the primary vector of these viruses. It also suggests that queen selection programs might benefit from monitoring ovary health and metabolic resilience, not just egg-laying performance.
New Queen Process
But beyond implications for beekeeping, the study reveals a profound portrait of how a colony maintains its integrity. When the queen’s chemical signature fades, workers quietly take control of their future. They construct new queen cells, select the youngest larvae or eggs, and feed them copious amounts of royal jelly—the exclusive diet that transforms an ordinary larva into a queen. This transition happens with a calm efficiency that belies its brutality.
When a new queen emerges, the final act of the drama begins. She may immediately seek out and kill the old queen, or the two may coexist temporarily until workers favor one over the other. Sometimes the workers simply neglect the old queen, withdrawing care until she weakens and dies—a quiet and merciless form of political retirement known as “retirement by neglect.”
McAfee’s research illustrates that a queen’s reign is held together not by force or symbol, but by a fragile chemical thread. If her body falters—because of viruses, stress, or aging—her pheromones falter too. Once her scent of power fades, so does her rule. Within the hive, beneath the hum of thousands of wings, lies a social system that tolerates no instability. And when the queen can no longer sustain her chemical authority, the colony wastes no time in preparing a new leader to secure its survival. (Sulung Prasetyo)
