One of the key symptoms is the disappearance of entire colonies of bees, leaving few if any workers, empty hives with combs filled with honey and young larvae still encapsulated, and yet no significant signs of dead bees in or around the hive.
As CCD has spread around the world, so has research to find a cause for this perplexing phenomenon. Suspected causes range from viruses, fungus, pesticides, and bee management techniques to queen breeding and many more possible CCD causes.
New research describing how Apocephalus borealis, a phorid fly, affects honey bees in a manner that may explain their sudden disappearance. Published in PLoS ONE, January 3, 2012
This particular species is native to North America where it usually targets bumble bees, yellowjacket wasps, and a even black widow spiders as its hosts. But since honey bees are not native to North America, it seems to have adapted to these new hosts.
One of the primary symptoms of bees attacked by the parasite is a change of behavior which cause them to leave the hive at night and subsequently die. The phorid fly larvae were found in bees attracted to lights at night in the San Francisco area where the study was performed. Unlike other insects attracted to the light, the bees were disoriented; walking in circles or unable to stand and eventually died. Whether the parasite changes the behavior of the bee to cause it to fly out at night or whether the parasitized bee leaves in an attempt to protect the hive is unknown and further study is needed to understand the process.
A serious concern is that with the honey bee host, the phorid fly has a new vector that may enable it to spread throughout the world. Nevertheless, understanding the life cycle and exactly how the phorid fly affects the bee, and how to prevent the attack is the goal of this research.
Image Credit: Image provided with original paper.
Author, Jamie Ellis (2007). Colony Collapse Disorder (CCD) in Honey Bees (Publication #ENY-150). Gainesville: University of Florida Institute of Food and Agricultural Sciences. Retrieved 12 January 2012, from http://edis.ifas.ufl.edu/DLN.
Agricultural Research Service. Questions and Answers: Colony Collapse Disorder. Retrieved 12 January 2012, from http://www.ars.usda.gov/News/docs.htm?docid=15572
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