Male honeybees inject queens with blinding toxins
They say love is blind, but if you’re a queen honeybee it could mean true loss of sight.
New research finds male honeybees inject toxins during sex that cause temporary blindness. All sexual activity occurs during a brief early period in a honeybee’s life, during which males die and queens can live for many years without ever mating again.
UC Riverside’s Boris Baer, a professor of entomology, said males develop vision-impairing toxins to maximize the one fleeting opportunity they may ever get to father offspring.
“The male bees want to ensure their genes are among those that get passed on by discouraging the queen from mating with additional males,” said Baer, senior author of the study that discovered these blinding findings published today in the journal eLife. “She can’t fly if she can’t see properly.”
The toxins identified by the team are proteins contained in male bees’ seminal fluid, which is a substance that helps maintain sperm. Earlier work by Baer’s team also discovered honeybee seminal fluid toxins that kill the sperm of rivals. All honeybees make these proteins, though some may make more of it than others.
Baer first became interested in bees’ seminal fluid years ago as a doctoral student. During early projects, he noticed that if bumblebee queens were injected only with the fluid and not the sperm during insemination, the queens stopped mating and became increasingly aggressive toward males. He wanted to understand why.
Roughly 10 years ago, Baer and his international team began analyzing which proteins could be found in honeybees’ fluids.
“We found at least 300 of these ‘James Bonds,’ little secret agents with specific missions,” he said.
The team was not entirely surprised to find a protein that attacks the sperm of other males, as this behavior can be found in other insects. But they were surprised to find the protein that impacts genes responsible for vision in the queen’s brains.
A molecular understanding of honeybee mating habits could eventually be used to improve breeding programs and help insects that pollinate many of the foods we eat.
“More than a third of what we eat depends on bee pollination, and we’ve taken bees’ services for granted for a very long time,” Baer said. “However, bees have experienced massive die-offs in the last two decades. Anything we can do to help improve their numbers will benefit humans, too.”