After almost 40 years looking at toxic chemicals and bees (remember, I  
spent much of my career working for EPA and DOE, using bees as environmental  
monitors of industrial, military, and agricultural chemicals - one thing was  
clear - body size is a factor.    
 
I've seen leaf cutters falling out of the sky and honey bees sustaining  
little damage on the same field following a spray incident.
 
The same exposure dose may result in a higher effective dose to a small bee 
 versus a large bee - e.g., leaf cutter - honey bee - bumble bee.
 
Admittedly, this is just one factor in a complex of issues that affect  
dose.  
 
Jerry

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