Researchers ID queens, mysterious disease syndrome as key factors in bee colony deaths

Mar 04, 2013
Researchers id queens, mysterious disease syndrome as key factors in bee colony deaths
Researchers have identified key risk factors in bee colony deaths. Credit: David Tarpy, North Carolina State University

(Phys.org) —A new long-term study of honey bee health has found that a little-understood disease study authors are calling "idiopathic brood disease syndrome" (IBDS), which kills off bee larvae, is the largest risk factor for predicting the death of a bee colony.

"Historically, we've seen symptoms similar to IBDS associated with viruses spread by large-scale infestations of ," says Dr. David Tarpy, an associate professor of entomology at North Carolina State University and co-author of a paper describing the study. "But now we're seeing these symptoms – a high percentage of deaths – in colonies that have relatively few of these mites. That suggests that IBDS is present even in colonies with low mite loads, which is not what we expected." The study was conducted by researchers from NC State, the University of Maryland, Pennsylvania State University and the U.S. (USDA).

The study evaluated the health of 80 commercial colonies of honey bees (Apis ) in the eastern United States on an almost monthly basis over the course of 10 months – which is a full working "season" for commercial . The goal of the study was to track changes in bee colony health and, for those colonies that died off, to determine what factors earlier in the year may have contributed to colony death. Fifty-six percent of the colonies died during the study.

"We found that colonies affected by IBDS had a risk factor of 3.2," says Dr. Dennis vanEnglesdorp of the University of Maryland, who was lead author on the paper. That means that colonies with IBDS were 3.2 times more likely to die than the other colonies over the course of the study.

While the study found that IBDS was the greatest risk factor, a close runner-up was the occurrence of a so-called "queen event."

colonies have only one queen. When a colony perceives something wrong with its queen, the workers eliminate that queen and try to replace her. This process is not always smooth or successful. The occurrence of a queen event had a risk factor of 3.1.

"This is the first time anyone has done an epidemiological study to repeatedly evaluate the health of the same commercial over the course of a season," Tarpy says. "It shows that IBDS is a significant problem that we don't understand very well. It also highlights that we need to learn more about what causes colonies to reject their queens. These are areas we are actively researching. Hopefully, this will give us insights into other health problems, including colony collapse disorder."

The paper, "Idiopathic brood disease syndrome and queen events as precursors of colony mortality in migratory beekeeping operations in the eastern United States," is published in the February issue of Preventive Veterinary Medicine.

Explore further: Science casts light on sex in the orchard

More information: www.sciencedirect.com/science/… ii/S0167587712002656

Related Stories

A superorganism in trouble

May 23, 2008

In a time of global warming and catastrophic failure of bee colonies around the world, the new book "The Buzz about Bees" by Juergen Tautz is a timely call for an appreciation of the intricacy of the sociophysiological and ...

Survey reports 2010/2011 winter honey bee losses

May 23, 2011

Total losses from managed honey bee colonies nationwide were 30 percent from all causes for the 2010/2011 winter, according to the annual survey conducted by the U.S. Department of Agriculture (USDA) and the Apiary Inspectors ...

Survey reports latest honey bee losses

Apr 29, 2010

Losses of managed honey bee colonies nationwide totaled 33.8 percent from all causes from October 2009 to April 2010, according to a survey conducted by the Apiary Inspectors of America (AIA) and the Agricultural Research ...

Bees Throw Out Mites

Sep 11, 2009

Honey bees are now fighting back aggressively against Varroa mites, thanks to Agricultural Research Service (ARS) efforts to develop bees with a genetic trait that allows them to more easily find the mites ...

Recommended for you

'Divide and rule'—raven politics

21 minutes ago

Mythology has attributed many supernatural features to ravens. Studies on the cognitive abilities of ravens have indeed revealed that they are exceptionally intelligent. Ravens live in complex social groups ...

Science casts light on sex in the orchard

19 hours ago

Persimmons are among the small club of plants with separate sexes—individual trees are either male or female. Now scientists at the University of California, Davis, and Kyoto University in Japan have discovered ...

Four new dragon millipedes found in China

21 hours ago

A team of speleobiologists from the South China Agriculture University and the Russian Academy of Sciences have described four new species of the dragon millipedes from southern China, two of which seem to ...

Scientist creates automatic birdsong recognition app

Oct 30, 2014

Dr Dan Stowell, an EPSRC Research Fellow in QMUL's School of Electrical Engineering and Computer Science, has used a grant from Queen Mary Innovation to develop a prototype for an app that turns his research ...

User comments : 1

Adjust slider to filter visible comments by rank

Display comments: newest first

Caliban
not rated yet Mar 04, 2013
Yes, it is strikingly apparent that these researchers went out of their way to identify some other cause of CCD than environmental poisoning. This problem with larval mortality, aka "IBDS" isn't a new finding, as nate pointed out, above.

Worth noting is that they studied no wild or non-commercial domesticated bee colonies in an effort to develop any ACTUAL, REAL-WORLD basis for comparison.

One has to wonder at the extremely poor design of the research, and as a result of that reflection, has to also question the motives of the researchers themselves, at least in Leadership terms.

That same questioning could also apply to other portions of the process, as well...there may be a taint of special interest here.

Please sign in to add a comment. Registration is free, and takes less than a minute. Read more

Click here to reset your password.
Sign in to get notified via email when new comments are made.