a Elwin Stillman provided link...
https://www.youtube.com/watch?v=4LL2LLvmgQg by the UoG Honey Bee
Research Center.

>thanks for sharing the link...

>As most here I would guess know defensive behavior can be generated for a long list of reasons < season and dearth are two context that always need to be kept in mind if you are assessing hives for gentleness/defensive characteristics. One might suspect that polyandry is at least a good part of the reason that drone will impact defensive nature of a given hive.

>I would also suggest (based on recent experience here with genetic origin based on lab work) that not all European bees are gentle and not all Africanized hives are excessively defensive.  

>Lastly selecting for one characteristic is a potential disaster just waiting to happen.

Gene in Central Texas...    

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