A western honey bee’s stinger is a final line of defense, typically leading to the bee’s demise as it embeds itself in flesh and delivers venom. New research published in the Proceedings of the National Academy of Sciences is shedding light on the effectiveness of this defense mechanism. Using modern cameras, Fiorella Ramirez Esquivel, a postdoctoral researcher at Macquarie University in Australia and the lead author, was able to capture the bee stinger in action.
To analyze the stinger’s mechanics, Ramirez Esquivel and her team utilized high-speed cameras that could record hundreds of frames per second. By exploiting the translucent nature of the venom sac and stinger, they employed strong lighting to highlight the internal structures. The experiments involved live honey bees, where the stingers were removed and the bees were euthanized promptly due to the stinger’s short-lived activity once separated from the bee’s body.
The study revealed a unique double-piston design within the stinger, involving specialized valves that drive the barbed stinger deeper while continuously pumping venom from the sac into the flesh. This intricate system, likened to a double piston design, facilitates the flow of venom and the penetration of the stinger. Further examination through 3D printing helped researchers understand how these valves function to propel the stinger and maintain venom flow.
Juliana Rangel, an apiculture professor at Texas A&M University, expressed fascination with the study’s findings, which surpassed conventional microscopic images. The defense mechanism of honey bees, particularly the western honey bee, involves sacrificing part of their body as a means of defense for the colony, known as autotomy. The stinger’s barbs aid in remaining embedded, enhancing the bee’s chances of warding off threats.
Notably, honey bee stingers release pheromones to recruit other bees for collective defense. While this defense mechanism may not always be effective against tougher skin or fur, continuous penetration and the barbed design enhance its defensive capabilities. The study hints at potential medical applications of these findings, offering insights into the intricate system of honey bee stingers.
The study prompts questions about other honey-producing bees and their lack of stingers, posing an intriguing topic for further exploration into the evolutionary adaptations of different bee species.
