Texas Tech University

Robert Bradley

Professor and Associate Chair

Email: robert.bradley@ttu.edu

Phone: 806-834-1303

Lab Phone: 806-742-3039

Mammalian Systematics, Molecular Evolution, Infectious Diseases

  • Director, Natural Science Research Laboratory, Museum of Texas Tech University (1994-present)
  • Curator of Mammals, Museum of Texas Tech University (1994-present)
  • Graduate Faculty (1994-present)
  • Museum Science Faculty (1994-present)
Bradley, Robert


  • Ph.D., Biological Sciences, Texas Tech University (1991)
  • M.S., Wildlife & Fisheries Sciences, Texas A&M University (1986)
  • B.S., Wildlife & Fisheries Sciences, Texas A&M University (1983)

Web Links


Systematics and molecular evolution in mammals, particularly in geomyoid and sigmodontine rodents. Use of genomic methods to understand patterns diversification and speciation.  Examination of hybrid zones between genetically distinct taxa; including isolating mechanisms and the dynamics of genetic introgression. Determining the origin of hybrizymes generated from 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 be better interphased with natural history collections. Natural history and distributions of mammalian species.


See Link (pdf) for Complete List of Publications.  

  • 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.
  • Bradley, R. D., J. J. Bull, A. D. Johnson, and D. M. Hillis.  1993.  Origin of a novel allele in a mammalian hybrid zone.  Proceedings National Academy of Sciences, 90:8939-8941.
  • Jones, J K., Jr., R. D. Bradley, and R. J. Baker.  1995.  Hybrid pocket gophers and some thoughts on the relationship of natural hybrids to the rules of nomenclature and the Endangered Species Act.  Journal of Mammalogy, 76:43-49.
  • 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., R. M. Adkins, R. L. Honeycutt, and J. H. McDonald.  1998.  Nucleotide polymorphism at the alcohol dehydrogenase locus of pocket gophers, genus Geomys.  Molecular Biology and Evolution, 15:709-717.
  • Fulhorst, C. F., R. N. Charrel, S. C. Weaver, T. G. Ksiazek, R. D. Bradley, M. L.Milazzo, R. B. Tesh, and M. D. Bowen.  2001.  Geographic distribution and genetic diversity of Whitewater Arroyo virus in the southwestern United States.  Journal of Emerging Infectious Diseases, 7:403-407.
  • Bradley, R. D., and R. J. Baker.  2001.  A test of the genetic species concept: cytochrome- sequences and mammals.  Journal of Mammalogy, 82:960-973.
  • Edwards, C. W. and R. D. Bradley.  2002.  Molecular systematics of the genus Neotoma.  Molecular Phylogenetics and Evolution, 25:489-500.
  • Bradley, R. D., F. Mendez-Harclerode, M. J. Hamilton, and G. Ceballos.  2004.  A new species of Reithrodontomys from Guerrero, Mexico.  Occasional Papers, Museum of Texas Tech University, 231:i+1-1
  • Bradley, R. D., C. W. Edwards, D. S. Carroll, and C. W. Kilpatrick.  2004.   Phylogenetic relationships of Neotomine-Peromyscine rodents: based on DNA sequences from the mitochondrial cytochrome b gene.  Journal of Mammalogy, 85:389-395.
  • 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.
  • 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.
  • Baker, R. J., and R. D. Bradley.  2006.  Speciation in mammals and the genetic species concept.  Journal of Mammalogy, 87:643-662.
  • 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, ahantaviral species naturally associated with Oryzomys couesi (Coues' Oryzomys) in Honduras.  American Journal of Tropical Medicine and Hygiene, 75:1003-1010.
  • 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.
  • 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.
  • 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- bsequences.  Journal of Mammalogy, 88:1146-1159.
  • Cajimat, M. N. B., M. L. Milazzo, R. D. Bradley, and C. F. Fulhorst.  2007.  Catarina virus, an arenaviral species principally associated with Neotoma micropus (Southern Plains Woodrat) in Texas.  American Journal of Tropical Medicine and Hygiene, 77:732-736.
  • 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.
  • 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.
  • 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.
  • 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.
  • 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.
  • Bradley, R. D., L. C. Bradley, H. J. Garner, and R. J. Baker.  2012.  Cost of Collecting and Preparing Voucher Specimens for Natural History Collections.  Occasional Papers, Museum of Texas Tech University, 313:1-14.
  • Thompson, C. W., F. Ali Anwarali Khan, F. B. Stangl, Jr., R. J. Baker, and R. 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.
  • Cajimat, M. N. B., M. L. Milazzo, M. R. Mauldin, R. D. Bradley, and C. F. Fulhorst.  2013.  Diversity among Tacaribe viruses (Family Arenaviridae) associated with the southern plains woodrat (Neotoma micropus). Virus Research, 178:486-494.
  • Bradley, R. D., N. Ordóñez-Garza, C. G. Sotero-Caio, H. M. Huynh, C. W. Kilpatrick, L. I. Iñiguez-Dávalos, and D. 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.
  • Baker, R. J., L. C. Bradley, H. J. Garner, and R. 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.
  • Mauldin, M. R., M. L. Haynie, J. D. Hanson, R. J. Baker, and R. D. Bradley.  2014.  Multilocus characterization of a woodrat (Genus Neotoma) hybrid zone.  Journal of Heredity, 105:466-476.
  • Bradley, R. D., L. K. Ammerman, R. J. Baker, L. C. Bradley, J. A. Cook, R. C. Dowler, C. Jones, D. J. Schmidly, F. B. Stangl, Jr., R. A. Van Den Bussche, and B. Würsig.  2014.  Revised checklist of North American Mammals north of Mexico, 2014.  Occasional Papers, Museum of Texas Tech University, 327:1-27.
  • Ceballos, G., R. D. Bradley, and L. León Paniagua.  2014.  Cricetidae.  Pps. 271--440 in Mammals of Mexico (G. Ceballos, ed.).  Johns Hopkins University Press, Baltimore, Maryland. xi + 1-957.
  • Milazzo, M. L., M. N. Cajimat, M. R. Mauldin, S. G. Bennett, B. D. Hess, M. P. Rood, C. A. Conlan, K. Nguyen, J. W. Wekesa, R. D. Ramos, R. D. Bradley, and C. 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.
  • Bradley, R. D., D. J. Schmidly, B. R. Amman, R. N. Platt II, K. M. Neumann, H. M. Huynh, R. Muñiz-Martínez, C. López-González, and N. Ordóñez-Garza.  2015.  Molecular and morphometric data reveal multiple species in Peromyscus pectoralis.  Journal of Mammalogy, 96:446-459.
  • Platt II, R. N., C. W. Thompson, B. R. Amman, M. S. Corley, and R. D. Bradley.  2015.  What is Peromyscus?  Evidence from nuclear and mitochondrial DNA sequences for a new classification.  Journal of Mammalogy, 96:708-719.

In Press
  • Bradley, R. D., and M. R. Mauldin.  Molecular data indicate a cryptic species in Neotomaalbigula (Cricetidae: Neotominae) from northwestern México.
  • Schmidly, D. J., and R. D. Bradley. Mammals of Texas.  Submitted to the University of Texas Press.

Department of Biological Sciences

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    Department of Biological Sciences, Texas Tech University, Box 43131 Lubbock, TX 79409
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