Bumblebees: Disease From Honeybees Hurting Population, Study Says

Image: Bumblebees: Disease From Honeybees Hurting Population, Study Says

Thursday, 20 Feb 2014 02:34 PM

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The world's bumblebee population is dwindling after it was discovered that commercialized honeybees are spreading a deadly disease to their wild bee cousins, a new study shows.

That's a problem even though bumblebees aren't trucked from farm to farm like honeybees. They provide a significant chunk of the world's pollination of flowers and food, especially greenhouse tomatoes, insect experts told The Associates Press. And the ailments are hurting bumblebees even more, according to a study published Wednesday in the journal Nature.

"Wild populations of bumblebees appear to be in significant decline across Europe, North America, South America and also in Asia," said study author Mark Brown of the University of London. He said his study confirmed that a major source of the decline was "the spillover of parasites and pathogens and disease" from managed honeybee hives.

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Smaller studies have shown disease going back and forth between the two kinds of bees. Brown said his is the first to look at the problem in a larger country-wide scale and include three diseases and parasites. The study tracked nearly 750 bees in 26 sites throughout Great Britain. And it also did lab work on captive bees to show disease spread.

What the study shows is that "the spillover for bees is turning into (a) boilover," University of Illinois entomology professor May Berenbaum, who wasn't part of the study, said in an email.

Study co-author Matthias Furst of the University of London said the team's research does not definitely prove the diseases go from honeybees to bumblebees. But the evidence points heavily in that direction because virus levels and infection rates are higher in the honeybees, he said.

Bumblebees probably pick up diseases when they go to flowers after infected honeybees, Furst said. And sometimes bumblebees invade honeybee hives and steal nectar, getting diseases that way, he added.

Bumblebees can be nearly twice as big as honeybees, can sting multiple times, and don't produce surplus honey, like honeybees.

The latest research shows bumblebees are hurt more by disease, Brown said. In general, the average wild bumblebee lives 21 days, but the infected ones live closer to 15 days, he said. And while honeybee hives have tens of thousands of workers and can afford to lose some, bumblebee hives only have hundreds at the most.

"It's like Wal-Mart versus a mom-and-pop store," Berenbaum said in an interview.

Studies have shown that bumblebees provide $3 billion worth of fruit and flower pollination in the United States, while honeybees are closer to $20 billion, Berenbaum said.

The new study did not look at colony collapse disorder, which is more of a mysterious problem in North America than elsewhere. Other diseases and parasites have killed even more honeybees than the more recent colony collapse disorder.

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