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Caldwell Hahn

USGS Patuxent Wildlife Research Center
12110 Beech Forest Road
Laurel, MD 20708-4015

Telephone: 301-497-5653

Fax: 301-497-5624

Email: chahn@usgs.gov 

Research Wildlife Biologist

Hahn Publications and Reports:

Hahn, D. C., S. G. Summers, K. J. Genovese, H. He, and M. H. Kogut. 2013. Obligate brood parasites show more functionally effective innate immune responses: An eco-immunological hypothesis. Evolutionary biology online April 16. abstract

Hahn, D. C., S. G. Summers, L. H. He, K. J. Genovese, and M. H. Kogut. 2013. Enhanced innate immune responses in a brood parasitic cowbird species: degranulation and oxidative burst. Avian Diseases 57(2):285-289. abstract

Hahn, D. C. and W. K. Reisen. 2011. Heightened exposure to parasites favors the evolution of immunity in brood parasitic cowbirds. Evolutionary Biology 38(2):214-224. abstract

Hahn, D. C. 2011. Patterns of maternal yolk hormones in eastern screech owl eggs (Megascops asio). General and Comparative Endocrinology 172(3):423-429. abstract

Hahn, D. C. and G. W. Smith. 2011. Life history trade-offs between longevity and immunity in the parasitic brown-headed cowbird? Open Evolution Journal 5:8-13. abstract

Houdek, B. J., M. P. Lombardo, P. A. Thorpe, and D. C. Hahn. 2011. Innate immunity is not related to the sex of adult Tree Swallows during the nestling period. Condor 113(4):853-859. abstract

Stambaugh, T., B. J. Houdek, M. P. Lombardo, P. A. Thorpe, and D. C. Hahn. 2011. Innate immune response development in nestling Tree Swallows. Wilson Journal of Ornithology 123(4):779-787. abstract

Kozlowski, C. P. and D. C. Hahn. 2010. Developmental changes in serum androgen levels of Eastern Screech-Owls (Megascops asio). Wilson Journal of Ornithology 122(4):755-761. abstract

Kozlowski, CP, J Baumann, and DC Hahn. 2009. A new extraction technique for steroid hormones from yolk. Zoo Biology 28(2):137-143. abstract

Reisen, W. K. and D. C. Hahn. 2007. Comparison of immune responses of brown-headed cowbird and related blackbirds to West Nile and other mosquito-borne encephalitis viruses. Journal of Wildlife Diseases 43(3):439-449. (PDF)

Hahn, D.C, N.M. Nemeth, E. Edwards, P.R. Bright, and N. Komar. 2006. Passive West Nile virus antibody transfer from maternal Eastern Screech-Owls (Megascops asio) to progeny. Avian Diseases 50(3):454-455. (PDF)

Nemeth, NM, D.C. Hahn, D.H. Gould, R.A. Bowen. 2006. Experimental West Nile virus infection in Eastern Screech Owls (Megascops asio). Avian Diseases 50(2):252–258. (PDF)

Hahn, D. C., J. S. Hatfield, M. A. Abdelnabi, J. M. Wu, L. D. Igl, and M. A. Ottinger. 2005. Inter-species variation in yolk steroid levels and a cowbird-host comparison. Journal of Avian Biology 36(1):40-46. (PDF)

Brittan-Powell, E., B. Lohr, D.C. Hahn, R. Dooling, 2005. Auditory brainstem responses in the Eastern Screech Owl: an estimate of auditory thresholds. Journal of the Acoustical Society of America 118(1): 314-321. abstract

Morrison, M. L. and D. C. Hahn. 2002. Geographic variation in cowbird distribution, abundance, and parasitism. Pages 65-72 in T. Luke George and David S. Dobkin, editors. Effects of habitat fragmentation on birds in western landscapes: contrasts with paradigms from the eastern United States. Studies in Avian Biology 25. 270 pp. (PDF)

O'Connell, M.A., B.A. Noon, M. Main,  T. Dobson, D.C. Hahn, W. Reid, L. Gerber, J. Dudley, and J. Shaw. 2002.  Report of the Policy Committee.  Society for Conservation Biology.

Hahn, D.C. and R.D. Price. 2001. Lice as probes. Trends in Ecology and Evolution 16(8):432-433. abstract

Hahn, D. C. and J. R. O'Connor. 2002. Contrasting determinants of abundance in ancestral and colonized ranges of an invasive brood parasite. Pages 219-228 in J. Michael Scott, Patricia J. Heglund, Michael L. Morrison, Jonathan B. Haufler, and William A. Wall, editors. Predicting species occurrences : issues of accuracy and scale. Island Press, Washington, DC. xvii, 868 pp. (PDF)

Longmire, J. L., J. L. Roach, M. Maltbie, P. S. White, O. L. Tatum, K. D. Makova, and D. C. Hahn. 2001. Tetranucleotide microsatellite markers for the Brown-headed Cowbird Molothrus ater. Journal of Avian Biology 32(1):76-78. (PDF)

Hahn, D. C., R. D. Price, and P. C. Osenton. 2000. Use of lice to identify cowbird hosts. Auk 117(4):943-951. (PDF)

Hahn, D. C. and J. S. Hatfield. 2000. Host selection in the forest interior: cowbirds target ground-nesting species. Pages 120-127 in J. N. M. Smith, T. Cook, S. Rothstein, S. Robinson, and S. Sealy. Ecology and management of cowbirds and their hosts: studies in the conservation of North American passerine birds. University of Texas Press, Austin, TX. ix, 388 pp.

Hahn, D. C., J. A. Sedgwick, I. Painter, and N. Casna. 1999. A spatial and genetic analysis of Cowbird host selection. Pages 204-217 in M. L. Morrison, L. S. Hall, S. K. Robinson, S. I. Rothstein, D. C. Hahn, and T. D. Rich, editors. Research and management of the Brown-headed Cowbird in western landscapes. Studies in Avian Biology 18. 312 pp. (PDF)   

Hahn, D. C. 1999. [Book review] Cowbirds and Other Brood Parasites by Catherine Ortega. Tucson, Arizona: University of Arizona Press (1998). The Avian Brood Parasites: Deception at the Nest by Paul A. Johnsgard. New York: Oxford University Press (1997) Parasitic Birds and their Hosts: Studies in Coevolution edited by S.I. Rothstein & S.K. Robinson. New York: Oxford University Press (1998). Animal Behaviour 58(5):1155-1160. abstract

Longmire, J.L., D.C.Hahn, and J.L. Roach. 1999.  Low abundance of microsatellite repeats in the genome of the Brown-Headed Cowbird (Molothrus ater). Journal of Heredity 90(5): 574-578. PDF open access

Morrison, M. L., L. S. Hall, S. K. Robinson, S. I. Rothstein, D. C. Hahn, and T. D. Rich, editors. 1999. The ecology and management of the Brown-headed Cowbird in western landscapes. Studies in Avian Biology No. 18. 312 pp.

Dodd, M.G., T.M. Murphy, D.C. Hahn, and R.L. Joyner. 1999. Managing brackish coastal wetlands for increased biological diversity and abundance, Technical Report to South Carolina Division of Natural Resources..

Seastedt, T., C. Driscoll, W. Fink,  D.C. Hahn, F. Harris, E. Kellogg, H.R. Lane, T. Markow, L. A. McDade, T. Parker, P. Peckol, B. Theirs, E. Wells, and R. Zink,  1997.  Review by the Committee of Visitors of the Long-term Ecological Reserves Network (LTER) Program. Division of Environmental Biology, National Science Foundation.  Final Report.

Hahn, D.C. 1997, Departmental budgets and scientific costs.  Report to the Director, National Museum of Natural History, Smithsonian InstitutionFinal Report.

Hahn, D.C.  1996. Critical factors in establishing a grants study section in behavioral biology. National Institutes of Health, Division of Research Grants.  Final Report

Allen, M.,  J. Baker, W.U. Brigham, D. Davison, D.C. Hahn, J. Humphries, B. Meeson,  and H.M. Swain. 1996. Report of the Long-term Ecological Reserves (LTER) Network Office Review Team. National Science Foundation.  Final Report.

Link, W.A. and D. C. Hahn, 1996.  Empirical Bayes estimation of proportions with application to cowbird parasitism rates.  Ecology 77(8):2528-2537. (PDF)

Hahn, D. C. and J. S. Hatfield. 1995. Parasitism at the landscape scale: Cowbirds prefer forests. Conservation Biology 9(6):1415-1424 . abstract

Hahn, D. C. and R. C. Fleischer. 1995. DNA fingerprint similarity between female and juvenile brown-headed cowbirds trapped together. Animal Behaviour 49(6):1577-1580. abstract

Hahn, D.C. 1995. Sections on Merit Review, Program-level Review, Project-level Review, and Performance Evaluation at the Project Level, in Merit Review and Competitive Awards for Federally Funded Environmental and Natural Resources R & D, in Report on Federal Peer Review, White House Office of Science and Technology Policy Committee on Environment and Natural Resources.                 

Hahn, D. C. 1995. [Book review] Eastern Screech Owl: Life History, Ecology and Behavior in the Suburbs and Countryside, by Frederick Gehlback. Wildlife Review 250:454. (PDF)

Hahn, D.C.  1995. Improving peer review in federal agency science, National Biological Survey, Department of the Interior.

Duffy, D.C. and D. Caldwell Hahn. 1993.  [Letter to the editor: Science and the glass ceiling].  Bulletin of the Ecological Society of America 74(3):229-230.

Hahn, D. Caldwell. 1985.  Balancing both worlds: environment and development in the third world. Horizons: 12:7-11.

Markman, M., R. Bulger, and D.C. Hahn. 1988. Resources for Clinical Investigation, National Academy of Sciences, Institute of Medicine.

Hahn, D.C. 1984. Environmental aspects of development planning in the Santiago and Mira River Basins, Ecuador, in "Regional Development Planning: guidelines for Regional Development Planning:  Guidelines and Case Studies," Organization of American States and National Park Service.

Hahn, D.C. 1984. Coastal Resource Management: Design for a $5 million Development Assistance Project in Southeast Asia and Latin America, Agency for International Development.

Hahn, D.C. and D. Kinsey.1984. Ecuador: Assessment for a Coastal Zone Management, including major coastal issues, legal and institutional framework, and recommendations for research, training, and technical assistance, Report to U.S. Agency for International Development. "Indonesia: Country Assessment for a Coastal Zone Management Program.

Hahn, D.C., C. Sondheimer, and D. Kinsey. 1983.  Thailand: Country Assessment for a Coastal Zone Management Program, Report to the U.S. Agency for International Development.

Hahn, D.C., Carol Sondheimer, and David Kinsey. 1983.  Sri Lanka: Country Assessment for a Coastal Zone Management Program.  Report to U.S. Agency for International Development.

Hahn, D.C., Carol Sondheimer, and David Kinsey. 1983.  Philippines: Country Assessment for a Coastal Zone Management Program, Report to  the U.S. Agency for International Development.

Hahn, D.C., Carol Sondheimer, and David Kinsey. 1982.  Coastal Resource Management: Design for Pilot Projects in Asia and Latin America, Agency for International Development. 

Hahn, D.C.  1981. The Economic Rationale for Protection and Management of Natural Areas in Developing Countries, Report to UNESCO, Man and the Biosphere Committee.

Hahn, D.C. and R. Luke. 1981, Review and Analysis of Case Studies on Arid Land Management in Developing Countries, National Park Service,  Office of International Affairs.

Hahn, D. Caldwell.  1981.  Asynchronous hatching in the Laughing Gull: Cutting losses and reducing rivalry.  Animal Behavior 29(2):421-427. abstract

Forman, R.T.T. and D. Caldwell Hahn. 1980.  Spatial patterns of trees in a Caribbean Semi-Evergreen Forest.  Ecology 61(6):1268-l274. abstract

Hahn, D. Caldwell.  1980.  Discovery of ancestral maize species in Central Mexico.  Endangered Plant Quarterly, Kew Botanical Garden, Kew, England.

Burger, J., D. Caldwell Hahn, and J. Chase.  1979.  Aggressive interactions in mixed-species flocks of migrating shorebirds.  Animal Behaviour  27(2):459-470. abstract

Ricklefs, R.E., D. Caldwell Hahn, and W.A. Montevecchi. 1978.  The relationship between egg-size and chick size in the Laughing Gull and Japanese Quail, Auk 95(1):135-144. PDF

Burger, J., Caldwell Hahn, and L.M. Miller.  1978.  Behavior and sex role of  nesting anhingas in San Blas, Mexico.  Wilson Bulletin: 90(3):359-375. PDF

Burger, J., Marshall Howe, D. Caldwell Hahn, and J. Chase.  1977.  Effects of  tide cycles on habitat selection and habitat partitioning by migrating shorebirds.  Auk 94(4):743-758. PDF

Burger, J., D. Gladstone, Caldwell Hahn, L. Miller.  1977.  Inter- and intraspecific interactions at a mixed species roost of Ciconiiformes in San Blas, Mexico.  Biology of Behaviour 2:309-327.

Burger, J. and Caldwell Hahn.  1977.  Crow predation on black-crowned night heron clutches.  Wilson Bulletin 89(2):350-35l.  PDF

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