>It might suggest if the corn fields are free of bees and pollinators we are

> looking at (for example) the fish left when a lake is drained?


Exactly!  Hard to support a population of anything when most of the food
resource is gone.  Honey bees forage over a wider range, so may be off in
better pickings somewhere, whereas the native bees that stick near home
would be near their nests along the roadsides.

Butterflies face a similar situation, since their larvae need certain
plants to grow on--if all the "weeds" are gone, there is no food for their
larvae.

Such limited appropriate forage acreage for pollinators makes them all the
more susceptible to pesticides.

-- 
Randy Oliver
Grass Valley, CA
www.ScientificBeekeeping.com

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