School of
Integrative Biology
Stewart Berlocher

304A Morrill Hall
Office: 217-333-2929
Lab: (217)333-2929

Mail: 320 Morrill Hall, 505 S. Goodwin Ave., Urbana, IL 61801

Stewart Berlocher
Professor Emeritus - Entomology


PhD, 1976, University of Texas

Systematics, speciation, insect-plant coevolution

Berlocher is interested in insect-plant coevolution and the effect it has on insect systematics. His research concentrates on the fruit flies of the family Tephritidae (Diptera), particularly the economically important genus Rhagoletis. In an effort to understand speciation and host race formation in these flies, he has used behavioral, chromosomal, ecological, and genetic approaches. He has made much use of the technique of gel electrophoresis of enzymes to study the genetic differentiation of populations. His interests in addition to Rhagoletis include coevolution between the Tephritidae and the Compositae, insect biogeography, and the general use of biochemical methods in insect systematics.

Representative Publications

Berlocher, S. H. 1984. Insect molecular systematics. Ann. Rev. Entomol. 29, 403-433.

Swofford, D. L. and S. H. Berlocher 1987. Inferring evolutionary trees from gene frequency data under the principle of maximum parsimony. Syst. Zool. 36, 293-325.

McPheron, B. A., D. C. Smith and S. H. Berlocher 1988. Microgeographic genetic variation in the apple maggot Rhagoletis pomonella. Genetics 119, 445-451.

McPheron, B. A., D. C. Smith and S. H. Berlocher 1988. Genetic differences between host races of Rhagoletis pomonella. Nature 336, 64-66.

Berlocher, S. H. 1995. Population structure of the blueberry maggot, Rhagoletis mendax. Heredity 74, 542-555.

Berlocher, S. H. and B. A. McPheron. 1996. Population structure of the apple maggot fly, Rhagoletis pomonella. Heredity 77, 83-99.

Roethele, J. B., J. L. Feder, S. H. Berlocher, M. E. Kreitman and D. Lashkari 1997. Towards a Molecular Genetic Linkage Map for the Apple Maggot Fly, Rhagoletis pomonella (Diptera:Tephritidae): A Comparison of Alternative Strategies. Ann. Entomol. Soc. Am. 90, 470-479.

Berlocher, S. H. and D. S. Swofford 1997. Searching for phylogenetic trees under the frequency parsimony criterion: an approximation using generalized parsimony. Systematic Biology 46, 209-213.

Feder, J. L., J. B. Roethele, B. Wlazlo and S. H. Berlocher 1997. Selective maintenance of allozyme differences between sympatric host races of the apple maggot fly. Proc. Natl. Acad. Sci. USA 94 11417-11421.

Berlocher, S. H. 1998. Can sympatric speciation be proven from biogeographic and phylogenetic evidence?. In D. J. Howard and S. H. Berlocher (eds.), Endless Forms: Species and Speciation. New York, NY: Oxford University Press.