Thomas P. Hahn
Professor
tphahn (at) ucdavis (dot) edu

Neurobiology, Physiology and Behavior

Office
102 Animal Communication Lab
530-752-8531


Picture of Tom Hahn
 
Degrees:
1993 PhD University of Washington (Zoology)
1985 MS Stanford University (Biological Sciences)
1984 BS Stanford University (Biological Sciences)
Research Interests:

Interfaces of behavior, endocrine and neuroendocrine physiology, ecology, and evolution. Specifically environmental regulation of avian reproductive cycles, behavioral and physiological responses of birds to environmental cues, effects of unpredictable environmental events (e.g., storms) on behavior and physiology of free-living birds.
Environmental regulation of avian annual cycles of behavior, physiology and morphology; behavioral and physiological responses of birds to unpredictable environmental events.
Department and Center Affiliations:
Department of Neurobiology, Physiology and Behavior
Professional Societies:
Society for Integrative and Comparative Biology
Society for Behavioral Neuroendocrinology
CBS Graduate Group Affiliations:
Animal Behavior  
Graduate Groups not Housed in CBS:
Avian Sciences  
Publications:
  • Wingfield, J. C., and T. P. Hahn. 1994. Testosterone and territorial behavior in sedentary and migratory sparrows. Animal Behavior 47: 77-89.
  • Hahn, T. P. 1995. Integration of photoperiodic and food cues to time changes in reproductive physiology by an opportunistic breeder, the red crossbill, Loxia curvirostra (Aves: Carduelinae). Journal of Experimental Zoology 272: 213-226.
  • Hahn, T. P., J. C. Wingfield, R. Mullen, and P. J. Deviche. 1995. Endocrine bases of spatial and temporal opportunism in arctic-breeding birds. American Zoologist 35: 259-273.
  • Hahn, T. P. 1996. Cassin's Finch. (Carpodacus cassinii). In The Birds of North America, No. 240 (A. Poole and F. Gill, eds.). The Academy of Natural Sciences, Philadelphia; The American Ornithologists' Union, Washington, D. C.
  • Hahn, T. P., T. Boswell, J. C. Wingfield, and G. F. Ball. 1997. Temporal flexibility in avian reproduction: Patterns and mechanisms. Current Ornithology 14: 39-80. V. Nolan, Jr., E. D. Ketterson, and C. F. Thompson (eds.), Plenum, New York and London.
  • Hahn,T.P. 1998. Reproductive seasonality in an opportunistic breeder, the Red Crossbill, Loxia curvirostra. Ecology 79: 2365-2375.
  • Harbison HE, Nelson DA and TP Hahn. 1999. Long-term persistence of song dialects in the mountain white-crowned sparrow. Condor. 101:133-148.
  • MacDougall-Shackleton, S. A., E. A. MacDougall-Shackleton, and T. P. Hahn. 2001. Physiological and behavioural responses of female mountain white-crowned sparrows to natal- and foreign-dialect songs. Canadian Journal of Zoology 79: 325-333.
  • MacDougall-Shackleton, S. A, P. J. Deviche, R. D. Crain, G. F. Ball, and T. P. Hahn. 2001. Seasonal changes in brain GnRH immunoreactivity and song-control nuclei volumes in an opportunistically breeding songbird. Brain, Behavior and Evolution 58: 38-48.
  • MacDougall-Shackleton, E. A., E. P. Derryberry, and T. P. Hahn. 2002. Non-local male mountain white-crowned sparrows have lower paternity and higher parasite loads than males singing local dialect. Behavioral Ecology 13: 682-689.
  • Breuner, C. W. and T. P. Hahn. 2003. Integrating stress physiology, environmental change, and behavior in free-living sparrows. Hormones and Behavior 43: 115-123.
  • Sewall, K. B, T. R. Kelsey, and T. P. Hahn. 2004. Discrete variants of evening grosbeak flight calls. Condor 106: 161-165.
  • Hahn, T. P., M. E. Pereyra, S. M. Sharbaugh and G. E. Bentley. 2004. Physiological responses to photoperiod in three cardueline finch species. General and Comparative Endocrinology 137: 99-108.
  • Hahn, T. P., K. W. Sockman, C. W. Breuner and M. L. Morton. 2004. Facultative altitudinal movements by mountain white-crowned sparrows, Zonotrichia leucophrys oriantha, in the Sierra Nevada. Auk 121: 1269-1281.
  • MacDougall-Shackleton, S. A., G. F. Ball, E. Edmonds, R. Sul, and T. P. Hahn. 2005. Age and sex related variation in song-control regions in Cassins finches, Carpodacus cassinii. Brain, Behavior and Evolution 65: 262-267.
  • Sockman, K. W., K. B. Sewall, G. F. Ball, and T. P. Hahn. 2005. Modulation of male song effort in response to female reproductive competence: The economy of a courtship decision in the Cassin's finch. Biology Letters 1: 34-37.
  • MacDougall-Shackleton, E. A., E. P. Derryberry, J. Foufopoulos, A. P. Dobson, and T. P. Hahn. 2005. Parasite-mediated heterozygote advantage in an outbred songbird population. Biology Letters 1: 105-107.
  • Pereyra, M. E., S. M. Sharbaugh, and T. P. Hahn. 2005. Interspecific variation in photo-induced GnRH plasticity among nomadic cardueline finches. Brain Behavior and Evolution 66: 35-49.
  • MacDougall-Shackleton, S. A., M. E. Pereyra, and T. P. Hahn. 2005. GnRH, photorefractoriness, and breeding schedules of cardueline finches. Pp. 97-110 in Functional Avian Endocrinology, A. Dawson and P. J. Sharp, eds. Narosa Publishing House, New Delhi, India.
  • Hahn, T. P., M. E. Pereyra, M. Katti, G. M. Ward, and S. A. MacDougall-Shackleton. 2005. Effects of food availability on the reproductive system. Pp. 167-180 in Functional Avian Endocrinology, A. Dawson and P. J. Sharp, eds. Narosa Publishing House, New Delhi, India.
  • Goodson, J. L., C. J. Saldanha, T. P. Hahn, and K. K. Soma. 2005. Recent advances in behavioral neuroendocrinology: Insights from studies on birds. Hormones and Behavior 48: 461-473.
  • MacDougall-Shackleton, S. A., M. Katti, and T. P. Hahn. 2006. Tests of absolute refractoriness in four species of cardueline finch that differ in reproductive schedule. Journal of Experimental Biology 209: 3786-3794.
  • Lynn, S. E., T. P. Hahn and C. W. Breuner. 2007. Free-living male mountain White-crowned Sparrows exhibit territorial aggression without modulating total or free plasma testosterone. Condor 109: 173-180.
  • Hahn, T. P. and S. A. MacDougall-Shackleton. 2008. Adaptive specialization, conditional plasticity, and phylogenetic history in the reproductive cue response systems of birds. Philosophical Transactions of the Royal Society B 363: 267-286.
  • Hahn, T. P., J. M. Cornelius, K. B. Sewall, T. R. Kelsey, M. Hau, and N. Perfito. 2008. Environmental regulation of annual schedules in opportunistically-breeding songbirds: Adaptive specializations, or variations on a theme of white-crowned sparrow? General and Comparative Endocrinology 157: 217-226.
  • Breuner, C. W., S. H. Patterson, and T. P. Hahn. 2008. In search of relationships between the acute adrenocortical stress response and fitness. General and Comparative Endocrinology 157: 288-295.
Laboratory Personnel:
Hahn Lab, Animal Communication Lab

Current students and postdocs: Heather Watts (Postdoc); Jamie Cornelius (PhD student, Animal Behavior); Rodd Kelsey (PhD student, Animal Behavior); Maxine Zylberberg (PhD student, Animal Behavior); Danielle Brown (PhD student, Animal Behavior); Kati Brazeal (PhD student, Animal Behavior); Shelley Parker (Masters student, Avian Sciences). Former students and postdocs: Kendra Sewall (PhD 2008, Animal Behavior, currently postdoc UNC Chapel Hill); Kirsten Sanford (PhD 2006, MCIP, currently free-lance science educator, Bay Area); Marcel Losekoot (MS 2006, Avian Sciences, currently technician, Bodega Marine Lab); Elizabeth MacDougall-Shackleton (PhD 2000, Princeton University, currently assistant professor, University of Western Ontario); Scott MacDougall-Shackleton (postdoc, Princeton University, currently associate professor, University of Western Ontario); Maria Pereyra (postdoc, UCD, currently assistant professor, University of Tulsa).

Field Sites:
Tioga Pass, central Sierra Nevada, Mono County, CA, 9941 feet elevation
Crossbill Field Sites: Warner Mountains, Oregon; Jackson Hole, Wyoming
Teaching Interests:
Animal Behavior, Hormones and Behavior, Comparative Vertebrate Reproduction, Comparative Endocrinology, Ornithology
Courses:
NPB 102 Animal Behavior Winter,Summer 2
NPB 152 Hormones and Behavior Spring
PSC 123 Hormones and Behavior Spring