One simple observation.  A queenless colony will more or less cease  pollen 
collection, but will still gather nectar.  Same for a colony with a  viable 
queen  who is present, but not laying.  This follows the amount  of 
uncapped brood, as that decreases, so does the pollen collection, while the  nectar 
collection increases.
 
We've documented this in our studies.  Others have commented that if  one 
traps off pollen, the colony may increase the number of bees collecting  
pollen.  We'd extended this to say, if the colony doesn't need pollen, it  may 
shift most of its foraging  over to nectar, which  is needed for  the 
survival of the adult bees.
 
Jerry
 

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