>>Such drift would presumably follow the diffusion model
>Why would one presume this?
In my experience drifting takes many forms and no assumptions can be safely made.
I bought some blonde packages last year and installed them at one spot in a big yard of dark bees.
A while later, I was surprised to see blonde bees showing up in pretty well all hives in the yard.
We also are all aware, I am sure, of the effect of having a strong flow in only one direction from a yard where we find the hives on the side near the flow are taller and heavier than the hives on the far side.
Then there are drones...
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