Here's another reference about interactions between native bees and introduced honeybees: Sugden, E. A., and G. H. Pyke. 1991. Effects of honey bees on colonies of Exoneura asimillima, an Australian native bee. Australian Journal of Ecology 16:171-181. It cites some other appropriate references, including: Roubik, D. W. 1978. Competitive interactions between Neotropical pollinators and Africanized honey bees. Science 201:1030-1032. Roubik, D. W. 1983. Experimental community studies: time-series tests of competition between African and Neotropical bees. Ecology 64:971-978. David Inouye Dept. of Zoology University of Maryland