>Has anyone made a study of the effect on native bees, when honey bees, which
>are an exotic species, are introduced into an area?  Specific references
>would be appreciated. Thanks.
 
Depends on whether you mean African bees or the domestic European strains
(sounds like I'm doing my Monty Python routine) - in the former case, Dave
Roubik has published some work on competition between African Apis and
native stingless bees in Central America. For the latter case, I know of
nothing. I think Apis was imported too long ago for there to be anywhere in
North America which hasn't had European Apis around in our lifetimes.
 
Doug Yanega      Illinois Natural History Survey, 607 E. Peabody Dr.
Champaign, IL 61820 USA     phone (217) 244-6817, fax (217) 333-4949
  "There are some enterprises in which a careful disorderliness
        is the true method" - Herman Melville, Moby Dick, Chap. 82