domingo, 9 de septiembre de 2007

Virus named as possible factor in honey bee disorder

Israeli Acute Paralysis Virus (IAPV)

Between 50 and 90 percent of the commercial honey bee (Apis mellifera) colonies in the United States have been afflicted by Colony Collapse Disorder (CCD), and the disorder is making it difficult for U.S. commercial beekeepers to pollinate crops. About a quarter of beekeeping operations were affected by CCD during the 2006-2007 winter alone.

A comparison of healthy and unhealthy bee colonies points to a virus contributing to CCD, according to a report being published by the journal Science, at the Science Express web site, on 06 September. Science is published by AAAS, the nonprofit science society.

CCD is a puzzling phenomenon occurring in the United States – and possibly other countries where it is not yet confirmed – in which all adult bees disappear from the hive, leaving the honey and pollen behind. Few, if any, dead bees are found around the hive.

Researchers tested samples collected over three years across the United States from normal and CCD-affected hives. They also tested royal jelly imported from China, which is fed to bee larvae to start up a new colony, as well as apparently healthy bees imported from Australia, in an attempt to locate a source for an infectious agent. After detailed statistical comparison of all the samples, the molecular signs of Israeli Acute Paralysis Virus appeared to be associated with CCD.

“Other stressors to the colony are likely involved,” he said. Those stressors could be poor nutrition, pesticide exposure and parasitic mites. The next research steps include inducing CCD in healthy bees, determining the global distribution of IAPV and CCD and studying bees that appear to be resistant to CCD.

Ver mas: www.sciencemag.org

Aporte: Guillermo Figueroa

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