>>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... *********************************************** The BEE-L mailing list is powered by L-Soft's renowned LISTSERV(R) list management software. For more information, go to: http://www.lsoft.com/LISTSERV-powered.html Guidelines for posting to BEE-L can be found at: http://honeybeeworld.com/bee-l/guidelines.htm