Comparative physiology and physiological ecology- especially of bats
Phone: (707) 826-4132
Office: Science B 320
Personal Website: http://users.humboldt.edu/joe/
BSE (1980) Duke University
PhD (1991) Brown University
Biology of the Chiroptera
Summary of research
My research pursues the nuts and bolts of how animals work. In particular, I investigate processes that involve gas exchange
such as acid-base state, the control of ventilation, and how animals use that gas, i.e. metabolism. Where possible, I like to
explore these processes in their most extreme forms. Just as we can reveal critical elements of automotive engineering by racing
Formula 1 cars, we can also learn much by studying physiological function near its limits. For this reason, the most aerobic of
mammals, bats, have often been a subject for my research. I have explored their physiological functioning from the cold depths of
torpor, to how they acclimatize and fly at high altitudes.
- Redgwell, R.D., J.M. Szewczak, G. Jones, mad S. Parsons (2009) Classification of Echolocation Calls from 14 Species of Bat by Support Vector Machines and Ensembles of Neural Networks. Algorithms. 2:907-924.
- Rognan, C.B., J.M. Szewczak, and M.L. Morrison (2009) Vocal individuality of great gray owls in the Sierra Nevada. Journal of Wildlife Management. 73(5):755-760.
- Parsons, S., and J.M. Szewczak (2009) Detecting, Recording, and Analyzing the Vocalizations of Bats, in Ecological and Behavioral Methods for the Study of Bats, 2nd Edition, T.H. Kunz, ed. Johns Hopkins University Press (920 pp).
Szewczak, J.M., and E.B. Arnett (2007) Acoustic Monitoring of Bats, in Methods and Metrics for Studying Impacts of Wind Energy Development on Nocturnal Species (Birds and Bats), T.H. Kunz, ed. National Wind Coordinating Committee (NWCC). Journal of Wildlife Management 71(8):2449-2486.
Szewczak, J.M. (2004) Advanced analysis techniques for identifying bat species. Proceedings of the Bat Conservation
International Echolocation Symposium, Austin, TX, April, 2002. Published by Bat Conservation International.
Szewczak, J.M. and F.L. Powell (2003) Open-flow plethysmography with pressure-decay compensation. Respiration Physiology. 134:57-67.
Sullivan, S.G. and J.M. Szewczak (1998) Apneic oxygen uptake in the torpid pocket mouse, Perognathus parvus. Physiological Zoology. 71(6):624-632.
Szewczak, J.M., S.M. Szewczak, M.L. Morrison, and L. Hall (1998) Bats of the White-Inyo Range. Great Basin Naturalist. 58(1):66-75.
Szewczak, J. M. (1997) Matching gas exchange in the bat from flight to torpor. in: Comparative Aspects of the Control of
Arterial Blood Gases: Ventilatory and Cardiovascular Perspectives. American Zoologist. 37:92-100.
Szewczak, J.M. and D.C. Jackson (1992) Apneic Oxygen uptake in the torpid bat, Eptesicus fuscus. Journal of Experimental Biology. 173:217-229.
- Alyson Brokaw, Daniel Burrell, Jeffrey Clerk, Gabe Reyes, and Kaley Sullenger
- Former Grad Students:
Assessing monitoring techniques for bird populations in Sierra Nevada montane meadow and aspen communities.
- Ryan Byrnes
- Aaron Corcoran
- Automated acoustic identification of nine bat species of the eastern United States.
- Jean-Paul Kennedy
- Bats of the northern California old growth redwood forest: The interaction of bats and old growth redwoods across a vertical gradient.
- Cameron Rognan
Bioacoustic techniques to monitor populations of Great Gray Owls (Strix nebulosa) in the Sierra Nevada.
Roosting behavior of a maternal colony of Townsends Big-eared bat, Corynorhinus townsendii.