Queen Bees Demonstrate Remarkable Adaptation to Winter Flooding

Queen bumblebees exhibit remarkable resilience by surviving winter flooding through a unique ability to breathe underwater. A study published in the journal _Proceedings of the Royal Society B: Biological Sciences_ highlights how these bees can endure complete submersion, a significant adaptation that allows them to thrive in challenging environmental conditions.

During the winter months, queen bumblebees enter a dormant state known as diapause, which protects them from predators but makes them vulnerable to waterlogged environments caused by rainstorms and snowmelt. Researchers from the University of Ottawa conducted experiments to explore how these queens manage to survive such conditions. They induced diapause in the queens by simulating winter conditions in a cold, dark environment before submerging them in water-filled airtight chambers.

The research involved monitoring the gas exchange in the bees during submersion. The findings revealed that while submerged, the queens continued to produce carbon dioxide at a low rate, indicating that they were still respiring. However, the amount of carbon dioxide released significantly decreased during submersion, suggesting a shift to a different metabolic state. This adaptation allows them to survive prolonged periods underwater while relying on anaerobic metabolism, which leads to lactate accumulation in their bodies.

After being removed from the water, the queens exhibited a rapid increase in carbon dioxide production as their bodies recovered from the submersion. The study concludes that queen bumblebees can survive and recover from flooding through a combination of underwater respiration and metabolic adjustments, showcasing their extraordinary ability to adapt to extreme environmental challenges.