Kirchner compared the behaviour of
worker bees subjected to such vibrations every five
seconds for an hour, with
worker bees that experienced no vibrations for an hour.
We collected sample sets of adult
worker honey
bees from several areas and years: (1 — 2) Two initial sample sets of adult honey
bees from CCD colonies were obtained in 2006 — 2007 from twelve beekeeping operations from western, northeastern, and southeastern regions of the USA, (3) Samples from packages of imported Australian
bees provided a non-CCD 2007 reference, (4)
bees sampled in 2008 from a large, non-migratory beekeeping operation in northwestern Montana with no history of CCD provided a
second reference set, (5)
bee samples obtained in 2009 from a Florida apiary when 500 colonies suddenly collapsed constituted an independent CCD sample set by location and year.