Research from 2010 on the effect of migratory beekeeping on certain structures and hormone levels in the honeybee. Audio/video quality isn't the best, but seems like the study was well designed. The TLR is that the only structure that showed a statistically significant effect was the hypopharyngeal gland, which was "significantly smaller" in migrated bees. The researchers seemed to think that the damage wasn't reversible, and that it could have effects on future generations of bees (via suboptimal queen rearing).
Seems to give some more scientific backing to Paul/Jacqueline's Colony Collapse video on bee stress.
"It's an odd quirk of human nature that once a man has made up his mind to be a farmer, he wants to get into action quickly, irrespective of the dozen and one factors involved."--Haydn S. Pearson, "Success on the Small Farm"