Science News

Honey fends off infection in bees

Sun, 28th Apr 2013

Chris Smith

Honey does more than just feed bees, it also activates a host of chemical and immune defense mechanisms, new research has Honey Beesfound.

Through their pollination efforts, which boost crop yields, bees are worth over $10 billion annually to the US economy alone. But, globally, these tireless workers are in decline, with keepers of managed colonies reporting up to 30% losses in some areas over the last 5 years.

Colony collapse disorder (CCD) has been blamed for the majority of the decline, although this phenomenon - often manifesting as abruptly empty hives - remains unexplained.

The smoking gun appears to be pointing at increasing exposure to pesticides and parasites, but the actual mechanims are still not clear.

Now, scientist May Berenbaum and her colleagues from the University of Illinois at Urbana-Champaign, writing in PNAS, have discovered that the bee-equivalent of junk food may be to blame.

Analysing the constituents of honey, the researchers have found that a host of plant chemicals, which are naturally present at low levels and come from pollens, have a potent effect on bee metabolism.

Tests on bees fed the compounds and compared with control bees fed just sugar, show that the chemicals, including one called p-coumaric acid, powerfully activate genes for an anti-bacterial factor called abaecin, and enzymes called P450 cytochrome monooxygenases.

The role of these enzymes is to detoxify various chemicals to which bees are naturally exposed in the environment and through their diets.

But these same enzymes can also neutralise pesticides. And because current apiculture practices usually involve removing the bulk of the bees' honey stores from their hives and replacing it with merely a sugar solution, bees are most likely being deprived of the "nutraceutical" stimulus they need to protect themselves.

The solution may therefore be the insect-equivalent of a vitamin pill added to the diet to replace the deficient chemicals in the bee junk food the insects currently receive as a "reward" for the labours...

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I didn't realize that most of the natural honey was being replaced with sugar water to over-winter the bees, and perhaps during other seasons too. 

The French, of course, feed their bees chocolate instead of the plain sugar water.

Anyway, perhaps one should only take a portion of the honey from the bees, and leave them with at least some natural honey.

The Colony Collapse Disorder, of course, is complicated, and perhaps there are multiple causes.  In many cases, the hives are apparently abandoned, without dead bees, which would likely indicate a cause other than disease or poison. CliffordK, Thu, 9th May 2013

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