A western honey bee’s stinger is a weapon of last resort, designed to embed itself and deposit venom in flesh, often leading to the worker bee’s demise. Recent research in the Proceedings of the National Academy of Sciences sheds light on the effectiveness of this defense mechanism. Fiorella Ramirez Esquivel, the lead author and postdoctoral researcher at Macquarie University in Australia, mentioned that filming the bees in action was made possible by modern cameras.
Using high-speed cameras capturing hundreds of frames per second, Ramirez Esquivel and her team observed how the translucent venom sac and stinger allowed for better visualization of the distinct structures inside. Live honey bees were used in experiments, with their stingers removed and them immediately euthanized due to the stinger’s short active period once separated from the bee’s body.
The study revealed a double-piston design in the stinger, with specialized valves driving the barbed stinger deeper while continuously pumping venom into the flesh. The intricate system, described as more complex than a standard car engine, involves two valves moving past each other in a unique dance to allow for venom flow and stinger penetration.
Juliana Rangel, a professor of apiculture at Texas A&M University, found the research fascinating as it went beyond traditional images and diagrams, providing a deeper understanding of how venom continues to be delivered after a sting. The study highlighted how small twitches and movements in the stinger can persist for up to 15 minutes.
The defense mechanism of the western honey bee involves sacrificing part of its body as a means of protection, known as autotomy. The colony functions as a “superorganism,” with workers aiding in its defense. The stinger’s evolution and structure serve as an insurance policy to safeguard the larger colony, even at the cost of an individual bee’s life.
Unlike other bees, the western honey bee’s stinger has barbs that aid in remaining embedded in the target, enhancing the effectiveness of the defense mechanism. Additionally, the release of pheromones signals other bees to join in the defense against threats.
The study not only provides insights into the complex bee stinging system but also raises potential medical applications based on its findings. By utilizing high-speed videography, researchers are unraveling the intricacies of this mechanism, which could have broader implications beyond bee biology.