As the phenomenon known
as Colony Collapse Disorder (CCD) continues to plague
North American honey bees, apiologists have been scrambling to find both the cause and the cure for the
disappearance of millions of insects.
According to a report in
the open access journal Genome
Biology, new research from a group of Canadian scientists may have
found a major culprit responsible for the disorder: a parasitic mite known
as Varroa destructor.
Researchers found that the
tiny mites suck the blood of larval and adult bees, which leaves them weak and
more susceptible to infections. This parasitic relationship also increases the
risk of viral disease among hosts that already have a relatively weak immune
system due to a low number of immunity genes compared to more solitary insects like
flies.
The researchers also report
that the bees are not without recourse in their battle against the V.
destructor menace. At a research apiary in Grand Forks, British Columbia,
members of the honey bee colonies were observed removing diseased or parasitized
larvae from their brood cells and removing mites from remaining larvae.
This behavior prompted the
research team to examine protein differences in larvae and adults that could
serve as a signal for the hygienic insects. After analyzing approximately 1,200
proteins, the team found that several proteins that were associated with both
the opening of brood cells and the elimination of larvae. Some of the proteins
they identified were signals the probably assisted the adult bees in locating
infected larvae in a brood.
In addition to identifying the
key proteins in adult bees that are responsible for their hygienic behavior,
experts spotted a protein in damaged larvae that could also play a key role and
uncovered several other larval proteins that help fight off or resist
infection.
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