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> >I don't think I understand what your trying to say there??? Could you
> elaborate???
>
The drift of mites from collapsing colonies has been carefully measured by
a number of researchers. It can be up to 1500 mites over a relatively
short period of time. "Normal" figures are of course lower.
One can likely assume that the amount of immigration would be a function of
the number of collapsing colonies, the number of mites in those colonies,
the number of robbing colonies, etc.
If you have a lot of hives in an area, and few collapsing, then likely you
won't see a great amount of immigration. On the other hand, many of us
have seen our colonies being completely overwhelmed.
--
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com
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