Robert D. Bradley

Dr. Bradley's Curriculum vitae Dr. Bradley's Publications Dr. Bradley's Laboratory


Director and Curator of Mammals, Natural Science Research Laboratory, Museum of TTU

Associate Chair and Professor, Department of Biological Sciences, Texas Tech University


Ph.D., Texas Tech University, 1991
M.S., Texas A&M University, 1986
B.S., Texas A&M University, 1983






Research Interests:

Systematics and molecular evolution in mammals; particularly in geomyoid and cricetid rodents. Examination of hybrid zones between genetically distinct taxa; including isolating mechanisms and the dynamics of genetic introgression. Determining the origin of hybrizymes generated from 2 hybridization events. Chromosomal evolution and how changes in chromosome structure relate to models and mechanisms of speciation. Examination of the origin and evolution of rodent-borne viruses; especially in the use of rodent phylogenies and genetic structure to predict the transmission and evolution of the virus. Epidemiology and zoonoses of mammalian-borne viruses. Growth and utilization of natural history collections, especially those pertaining to mammals. Development of bioinformatics and how this field can better be interphased with natural history collections. Natural history and distributions of mammalian species. Genetic Species Concept and how it applies to mammals. How genomics and next generation methods can be applied to speciation in mammals. Use of natural history specimens and their associated data to predict distribution relative to environmental and climatic changes. In addition, I am trying to get into the field of mammalian genomics, particularly with using transcriptomes to isolate potential speciation genes and determine evolutionary relationships among mammalian species.

Selected Publications:

Schmidly, David J., and Robert D. Bradley. 2016. The Mammals of Texas. 7th Edition. University of Texas Press, Austin. 694pp.

Platt II, Roy N., Cody W. Thompson, Brian R. Amman, Megan S. Corley, and Robert D. Bradley. 2015. What is Peromyscus? Evidence from nuclear and mitochondrial DNA sequences for a new classification. Journal of Mammalogy, 96:708-719.

Bradley, Robert D., David J. Schmidly, Brian R. Amman, Roy N. Platt II, Kathy M. Neumann, Howard M. Huynh, Raúl Muñiz-Martínez, Celia López-González, and Nicté Ordóñez-Garza. 2015. Molecular and morphometric data reveal multiple species in Peromyscus pectoralis. Journal of Mammalogy, 96:446-459.

Milazzo, Mary Lou, Maria N. Cajimat, Matthew R. Mauldin, Stephen G. Bennett, Barry D. Hess, Michael P. Rood, Christopher A. Conlan, Kiet Nguyen, J. Wakoli Wekesa, Ronald D. Ramos, Robert D. Bradley, and Charles F. Fulhorst. 2015. Epizootilogy of Tacaribe serocomplex viruses (Arenaviridae) associated with neotomine rodents (Cricetidae, Neotominae) in southern California. Vector-Borne and Zoonotic Diseases, 15:156-166.

Ceballos, Gerardo, Robert D. Bradley, and Livia León Paniagua. 2014. Cricetidae. Pps. 271--440 in Mammals of Mexico (G. Ceballos, ed.). Johns Hopkins University Press, Baltimore, Maryland. xi + 1-957.

Bradley, Robert D., Loren K. Ammerman, Robert J. Baker, Lisa C. Bradley, Joseph A. Cook, Robert C. Dowler, Clyde Jones, David J. Schmidly, Frederick B. Stangl, Jr., Ronald A. Van Den Bussche, and Bernd Würsig. 2014. Revised checklist of North American Mammals north of Mexico, 2014. Occasional Papers, Museum of Texas Tech University, 327:1-27.

Mauldin, Matthew R., Michelle L. Haynie, J. Delton Hanson, Robert J. Baker, and Robert D. Bradley. 2014. Multilocus characterization of a woodrat (Genus Neotoma) hybrid zone. Journal of Heredity, 105:466-476.

Baker, Robert J., Lisa C. Bradley, Heath J. Garner, and Robert D. Bradley. 2014. “Door to drawer” costs of curation, installation, documentation, databasing, and long-term caring for mammal voucher specimens in natural history collections. Occasional Papers, Museum of Texas Tech University, 323:i-15.

Bradley, Robert D., Nicté Ordóñez-Garza, Cibele G. Sotero-Caio, Howard M. Huynh, C. William Kilpatrick, L. Ignacio Iñiguez-Dávalos, and David J. Schmidly. 2014. Morphometric, karyotypic, and molecular evidence for a new species of Peromyscus (Cricetidae: Neotominae) from Nayarit, México. Journal of Mammalogy, 95:176-186.

Cajimat, Maria N. B., Mary L. Milazzo, Matthew R. Mauldin, Robert D. Bradley, and Charles F. Fulhorst. 2013. Diversity among Tacaribe viruses (Family Arenaviridae) associated with the southern plains woodrat (Neotoma micropus). Virus Research, 178:486-494.

Thompson, Cody W., Faisal Ali Anwarali Khan, Frederick B. Stangl, Jr., Robert J. Baker, and Robert D. Bradley. 2013. Multi-locus analyses indicate a mosaic distribution of hybrid populations in ground squirrels (genus Ictidomys). Ecology and Evolution, 1-13 doi:10 1002/ece3.755.

Bradley, Robert D., Lisa C. Bradley, Heath J. Garner, and Robert J. Baker. 2012. Cost of Collecting and Preparing Voucher Specimens for Natural History Collections. Occasional Papers, Museum of Texas Tech University, 313:1-14.

Milazzo, M. L., M. N. B. Cajimat, H. E. Romo, J. G. Estrada-Franco, L. I. Iñiguez-Dávalos, R. D. Bradley, and C. F. Fulhorst. 2012. Geographic distribution of hantaviruses associated with Neotomine and Sigmodontine rodents in Mexico. Journal of Emerging Infectious Diseases, 18:571-576.

Cajimat, M. N. B., M. Louise Milazzo, M. L. Haynie, J. D. Hanson, R. D. Bradley, and C. F. Fulhorst. 2011. Diversity and phylogenetic relationships among the North American Tacaribe serocomplex viruses (Family Arenaviridae). Virology, 421:87-95.

Pinto, C. M., B. D. Baxter, J. D. Hanson, F. M. Méndez-Harclerode, J. R. Suchecki, M. J. Grijalva, C. F. Fulhorst, and R. D. Bradley. 2010. Using museum collections to detect pathogens: Trypanosoma cruzi in Texas woodrats. Journal of Emerging Infectious Diseases, 16:356-357.

Baxter, B. D., F. M. Mendez-Harclerode, C. F. Fulhorst, and R. D. Bradley. 2009. A molecular examination of relatedness, multiple maternity, and cohabitation of the southern plains woodrat (Neotoma micropus). Journal of Mammalogy, 90:819-831. 

Genoways, H. H., M. J. Hamilton, D. M. Bell, R. R. Chambers, and R. D. Bradley. 2008. Hybrid zones, genetic isolation and systematics of pocket gophers (genus Geomys) in Nebraska. Journal of Mammalogy, 89:826-836.

Bradley, R. D., N. D. Durish, D. S. Rogers, J. R. Miller, M. D. Engstrom, and C. W. Kilpatrick. 2007. Toward a molecular phylogeny for Peromyscus: evidence from mitochondrial cytochrome-b sequences. Journal of Mammalogy, 88:1146-1159.

Haynie, M. L., S. G. Bennett, M. Rood, B. Hess, C. F. Fulhorst, and R. D. Bradley. 2007. Genetic variation in multilocus microsatellite genotypes in two species of woodrats (Neotoma macrotis and N. fuscipes) from California. Journal of Mammalogy, 88:745-758.

Mendez-Harclerode, F. M., R. E. Strauss, C. F. Fulhorst, M. L. Milazzo, D. C. Ruthven III, and R. D. Bradley. 2007. Molecular evidence for high levels of intrapopulation genetic diversity in woodrats (Neotoma micropus). Journal of Mammalogy, 88:360-370.

Milazzo, M. L., M. N. B. Cajimat, J. D. Hanson, R. D. Bradley, M. Quintana, C. Sherman, R. T. Velasquez, and C. F. Fulhorst. 2006. Catacamas virus, a hantaviral species naturally associated with Oryzomys couesi (Coues’ oryzomys) in Honduras. American Journal of Tropical Medicine and Hygiene, 75:1003-1010.

Baker, R. J., and R. D. Bradley. 2006. Speciation in mammals and the genetic species concept. Journal of Mammalogy, 87:643-662.

Reeder, S. A., D. S. Carroll, C. W. Edwards, C. W. Kilpatrick, and R. D. Bradley. 2006. Neotomine-peromyscine rodent systematics based on combined analyses of nuclear and mitochondrial DNA sequences. Molecular Phylogenetics and Evolution, 40:251-258.

Bradley, R. D., D. S. Carroll, M. L. Haynie, R. Muñiz-Martínez, M. J. Hamilton, and C. W. Kilpatrick. 2004. A new species of Peromyscus from western Mexico. Journal of Mammalogy, 85:1184-1193.

Edwards, C. W. and R. D. Bradley. 2002. Molecular systematics of the genus Neotoma. Molecular Phylogenetics and Evolution, 25:489-500.

Bradley, R. D., and R. J. Baker. 2001. A test of the genetic species concept: cytochrome-b sequences and mammals. Journal of Mammalogy, 82:960-973.

Peppers, L. L. and R. D. Bradley. 2000. Cryptic species in Sigmodon hispidus: evidence from DNA sequences. Journal of Mammalogy, 81:332-343.

Bradley, R. D. and D. M. Hillis. 1997. Recombinant DNA sequences generated by PCR amplification. Molecular Biology and Evolution, 14:592-593.

Bradley, R. D., S. K. Davis, and R. J. Baker. 1991. Genetic control of premating-isolating behavior; Kaneshiro's hypothesis and asymmetrical sexual selection in pocket gophers. Journal of Heredity, 82:192-196.

Baker, R. J., S. K. Davis, R. D. Bradley, M. J. Hamilton, and R. A. Van Den Bussche. 1989. Ribosomal-DNA, mitochondrial-DNA, chromosomal, and allozymic studies on a contact zone in the pocket gopher, Geomys. Evolution, 43:63-75.


Dr. Bradley's Curriculum vitaeDr. Bradley's Publications Dr. Bradley's Laboratory