Bumblebee Queens Survive a Week Underwater, New Study Reveals

Queen bumblebees, vital pollinators facing increasing environmental pressures, possess a remarkable ability to survive prolonged submersion – up to a week, according to latest research from the University of Ottawa. This discovery challenges previous assumptions about the vulnerability of these insects to spring flooding and offers valuable insight into their resilience in a changing climate.

For years, scientists believed that queen bumblebees, in their dormant winter state (diapause), were susceptible to drowning when snowmelt and heavy rains inundated their underground nests. Still, a recent study published in The Royal Society Publishing on March 11, 2026, demonstrates that these queens can endure extended periods underwater, maintaining vital physiological functions.

The Science of Submersion

The research, led by Professor Charles-Antoine Darveau at the University of Ottawa, began with an observation by postdoctoral researcher Sabrina Rondeau: queen bumblebees could survive submersion for over a week, an extraordinary feat for a terrestrial insect. The University of Ottawa news release details the team’s investigation into the mechanisms behind this survival.

To replicate winter conditions, the researchers placed queens in diapause for four to five months, then submerged them in water for eight days. Throughout the experiment, they meticulously monitored the bees’ metabolic rate and tracked physiological changes. The key to their survival, it turns out, is a combination of metabolic depression and a unique ability to utilize anaerobic metabolism.

During diapause, the bumblebee queens drastically slow down their bodily functions to conserve energy. This already low energy demand is further aided by their ability to extract small amounts of oxygen directly from the surrounding water. However, the researchers discovered that this wasn’t the whole story. The queens also accumulate lactic acid, a byproduct of anaerobic metabolism – a process where cells produce energy without oxygen. Anaerobic metabolism allows the bees to continue functioning even when oxygen is scarce.

“They’re not relying on just one strategy,” explains Darveau. “They combine underwater gas exchange with anaerobic metabolism. That flexibility is what allows them to survive these extreme conditions.”

Implications for Bumblebee Populations

This discovery has significant implications for understanding the resilience of bumblebee populations, particularly in the face of climate change. As spring floods become more frequent and intense, the ability of queens to survive submersion could be crucial for colony establishment. Each surviving queen has the potential to found a new colony, making their survival paramount to the species’ continued success.

The research highlights the importance of these pollinators, which play a vital role in both ecosystems and agriculture. Protecting bumblebee populations is essential for maintaining biodiversity and ensuring food security. Understanding their survival mechanisms allows scientists to better predict how they might cope with future environmental challenges.

The Recovery Phase and Metabolic Cost

While the queens can survive prolonged submersion, it isn’t without a cost. After eight days underwater, the researchers observed a surge in metabolic rate as the bees worked to clear the accumulated lactic acid. This recovery phase lasts for two to three days, during which the bees essentially “repay” their metabolic debt. However, crucially, they remain in diapause throughout this process, resuming their low-energy hibernation state once the recovery is complete.

“That surge in metabolism coincides with clearing the accumulated lactate,” Darveau notes. “It’s essentially a recovery phase.” This physiological adjustment demonstrates the remarkable adaptability of these insects.

Study Details and Limitations

The study, published in the peer-reviewed journal The Royal Society Publishing, involved a controlled laboratory experiment. Researchers monitored metabolic rates and physiological changes in bumblebee queens during and after submersion. The full study provides detailed methodology and data analysis.

It’s important to note that this research was conducted under controlled conditions. The natural environment presents additional complexities, such as varying water temperatures, oxygen levels and the presence of other contaminants. Further research is needed to determine how these factors might affect the queens’ ability to survive submersion in the wild.

What Comes Next: Protecting Pollinators in a Changing World

The University of Ottawa team plans to continue investigating the physiological mechanisms that allow bumblebee queens to survive underwater. Future research will focus on understanding how different environmental factors, such as water temperature and oxygen levels, influence their resilience. This knowledge will be crucial for developing effective conservation strategies to protect these vital pollinators. The team also intends to explore whether similar mechanisms are present in other insect species.

This research underscores the remarkable adaptability of even seemingly fragile creatures. As climate change continues to reshape our world, understanding these survival strategies will be essential for preserving biodiversity and ensuring the health of our ecosystems. The ability of queen bumblebees to withstand prolonged submersion is a testament to the power of natural selection and a hopeful sign for the future of these important pollinators.