Although hardly an expert on Africanized honeybees, I gather from my
readings that Africanized Apis may have different competitive impacts on
native hymenoptera than the European honeybees.  European bees seem to
concentrate on abundant floral resources, often ignoring scattered or less
abundant flowers.  This leaves unexploited resources available to the
native hymenopterans, albeit at a reduced abundance.
	Isn't it true that the Africanized bee is able to more fully exploit
the floral resource spectrum, making it a potentially more dangerous invader
than european honeybees?  I remember reading or hearing somewhere that
one reason european Apis had not been very successful in the tropics was their
inability to use the more diverse and scattered floral resources there.  This
apparently hasn't been a problem for the Africanized honeybee.
	It may not be valid, therefore, to compare the impact of African
invasion to the impact of introducing European honeybee hives.  If the above
is true, it also suggests that the impact of the African invasion in the
southern US will further disrupt the native bee populations, above and beyond
the effect of the several century old invasion of european Apis.