One place where this question has been investigated is in Australia, where the
native pollinators that may be affected by Apis include honeyeater birds.
David Paton of the University of Adelaide is perhaps the best source for
information; Graham Pyke of the Sydney Museum has also worked on this
question.  I konw that some reports have been filed, but my impression is that
most of these studies remain unpublished.
 
      James Thomson