* Authors listed in italics are former students who have worked in the Powers lab.

Eberts, E. R., G. J. Tattersall, P. J. Augera, M. Curleya, M. I. Morado, E. G. Strauss, D. R. Powers, N. C. Soveral, B. W. Tobalske, and A. Shankar.  2023.  Free-living Allen’s hummingbirds (Selasphorus sasin) rarely use torpor while nesting.  Journal of Thermal Biology 112 (2023):103391. 

Garant, R., B. W. Tobalske, N. BenSassi, N. van Staaveren,T. Widowski, D. R. Powers, and A. Harlander-Matauschek.  2022.  Wing-feather loss in white-feathered laying hens decreases pectoralis thickness but does not increase risk of keel bone fracture. Royal Society Open Science 9:220155.

Garant, R., B. W. Tobalske, N. BenSassi, N. van Staaveren, D. Tulpan, T. Widowski, D. R. Powers, and A. Harlander-Matauschek.  2022.  Effects of clipping of flight feathers on resource use in Gallus gallus domesticus.  Royal Society Open Science 9:211561. 

Shankar, A., I. N. H. Cisneros, S. Thompson, C. H. Graham, and D. R. Powers.  2022.  A heterothermic spectrum in hummingbirds.  Journal of Experimental Biology 225:jeb243208.

León, B. M., B. W. Tobalske, N. Ben Sassi, R. Garant, D. R. Powers, and A. Harlander-Matauschek.  2021.  Domestic egg-laying hens, Gallus gallus domesticus, do not modulate flight performance in response to wing condition.  Royal Society Open Science 8:210196.  

Yap, K. N., D. R. Powers, M. L. Vermette, O. H-I Tsai, and T. D. Williams.  2021. Physiological adjustments to high foraging effort negatively affect fecundity but not final reproductive output in captive zebra finches.  Journal of Experimental Biology 224:235820

Yap, K. N., D. R. Powers, M. L. Vermette, O. H-I Tsai, and T. D. Williams.  2021. Sex-specific energy management strategies in response to training for increased foraging effort prior to reproduction.  Journal of Experimental Biology 224:235846

Tell, L. A., J. A. Hazlehurst, R. R. Bandivadkar, J. C. Brown, A. R. Spence, D. R. Powers, D. W. Agnew, L. W. Woods, and A. Engilis Jr.  2021.  Hummingbird (Family:  Trochilidae) Research:  Welfare-Conscious Study Techniques for Live Hummingbirds and Processing of Hummingbird Specimens.  Museum of Texas Tech University Special Publications No. 76.  Texas Tech University Natural Science Research laboratory.  Download

Shankar, A., R. J. Schroeder, S. M. Wethington, C. H. Graham, and D. R. Powers.  2020.  Hummingbird torpor in context: duration, more than temperature, is the key to nighttime energy savings.  Journal of Avian Biology 2020:e02305.  doi: 10.1111/jav.02305.

Shankar, A., D. R. Powers, L. M. Dávalos, and C. H. Graham.  2020.  The allometry of daily energy expenditure in hummingbirds:  an energy budget approach.  Journal of Animal Ecology 89:1254–1261 doi:10.1111/1365‐2656.13185.

Shankar, A., C. H. Graham, J. R. Canepa, S. M. Wethington, and D. R. Powers.  2019.  Hummingbirds budget energy flexibly in response to changing resources.  Functional Ecology 33:1904-1916.

Groom, D. J. E., M. C. B. Toledo, D. R. Powers, B. W. Tobalske, and K. C. Welch Jr.  2018.  Integrating morphology and kinematics in the scaling of hummingbird hovering metabolic rate and efficiency.  Proceedings of the Royal Society B 285:20172011.  Download

Powers, D. R. 2018.  Rivoli’s Hummingbird (Eugenes fulgens) V2.1.  In The Birds of North America (A. Poole and F. Gill, Eds.).  Philadelphia:  The Academy of Natural Sciences; Washington, D.C.:  The American Ornithologists’ Union. Online

Powers, S. D., M. R. McTernan, D. R. Powers, and R. A. Anderson.  2018.  Energetic consequences for a northern range-edge lizard population.  Copeia 106:468-476. Download

Friesen, C. R., D. R. Powers, and R. T. Mason.  2017.  Using whole-group metabolic rate to assess the energetics of courtship in red-sided garter snakes.  Animal Behaviour 130:177-185.  Download

Powers, D. R., K. M. Langland, S. M. Wethington, S. D. Powers, C. H. Graham, and B. W. Tobalske.  2017.  Hovering in the heat:  effects of environmental temperature on heat regulation in foraging hummingbirds.  Royal Society Open Science 4:171056.  Download

Cheng, B., B. W. Toblaske, D. R. Powers, T. L. Hedrick, Y. Wang, S. M. Wethington, G. T.-C. Chiu, and X. Deng.  2016.  Flight mechanics and control of escape manoeuvers in hummingbirds.  II.  Aerodynamic force production, flight control and performance limitations.  Journal of Experimental Biology.  219:3532-3543.  Download

Cheng, B., B. W. Toblaske, D. R. Powers, T. L. Hedrick, S. M. Wethington, and X. Deng.  2016.  Flight mechanics and control of escape manoeuvers in hummingbirds.  I.  Flight kinematics.  Journal of Experimental Biology.  219:3518-3531.  Download

Graham, C. H., S. R. Supp, D. R. Powers, P. Beck, M. C. W. Lim, A. Shankar, T. Cormier, S. Goetz, and S. M. Wethington.  2016.  Winter conditions influence biological response of migrating hummingbirds.  Ecosphere 7:e01470.  Download

Song, J., H. Luo, B. W. Tobalske, D. R. Powers, and T. L. Hedrick.  2016.  Three-dimensional simulation for fast forward flight of a calliope hummingbird.  Royal Society Open Science 3:160230.  Download

Friesen, C. R., D. R. Powers, P. E. Copenhaver, and R. T. Mason.  2015.  Size dependence in non-sperm ejaculate production is reflected in daily energy expenditure and resting metabolic rate.  Journal of Experimental Biology 218:1410-1418. Download

Powers, D. R., B. W. Tobalske, J. K. Wilson, H. A. Woods, and K. R. Corder.  2015. Heat Dissipation during Hovering and Forward Flight in Hummingbirds.  Royal Society Open Science 2:150598. Download

Supp, S. R., F. A. LaSorte, T. A. Cormier, M. C. W. Lim, D. R. Powers, S. M. Wethington, S. Goetz, and C. H. Graham.  2015. Citizen-science data provides new insight into annual and seasonal variation in migration patterns.  Ecosphere 6:Article 15. Download

Powers, D. R., P. W. Getsinger, B. W. Tobalske, S. M. Wethington, S. D. Powers, and D. R. Warrick.  2012.  Respiratory evaporative water loss during hovering and forward flight in hummingbirds.  Comparative Biochemistry and Physiology A 161:279-285. Download

Tobalske, B. W., A. A. Biewener, D. R. Warrick, T. L. Hedrick, and D. R. Powers.  2010.  Effects of flight speed upon muscle activity in hummingbirds.  Journal of Experimental Biology 213:2515-2523. Download

Warrick, D., B. W. Tobalske, and D. R. Powers.  2009. Lift production in the hovering hummingbird.  Proceedings of the Royal Society B 276:3747-3752. Download

Powers, D. R., J. A. Van Hook, E. A. Sandlin, and T. J. McWhorter. 2010. An examination of arthropod foraging in a southeastern Arizona hummingbird guild.  Wilson Journal of Ornithology 122:494-502. Download

Casotti, G., T. Waldron, G. Misquith, D. Powers, and L. Slusher. 2007. Expression and localization of an aquaporin-1 homologue in the avian kidney and lower intestinal tract. Comparative Biochemistry and Physiology A 147:355-362. Download

Tobalske, B. W., D. R. Warrick, C. J. Clark, D. R. Powers, T. L. Hedrick, G. A. Hyder, and A. A. Biewener.  2007.  Three-dimensional kinematics of hummingbird flight.  Journal of Experimental Biology 210:2368-2382. Download

Warrick, D. R., B. W. Tobalske, D. R. Powers, and M. H. Dickinison.  2007.  The aerodynamics of hummingbird flight.  American Institute of Aeronautics and Astronautics 41:1-5. Download

Warrick, D., B. W. Tobalske, and D. R. Powers.  2005.  Aerodynamics of the hovering hummingbird.  Nature 435:1094-1097. Download

Powers, D. R.  2004.  The impact of social interactions on torpor use in hummingbirds.  In Life in the Cold:  Evolution, Mechanisms, Adaptation, and Application.  Twelfth International Hibernation Symposium (Barns, B. M, and Carey, H. V. eds.).  Biological Papers of the University of Alaska, number 27.  Fairbanks, AK, USA:  Institute of Arctic Biology, University of Alaska. Download

Tobalske, B. W., D. L. Altshuler, and D. R. Powers.  2004.  Take-off mechanics in hummingbirds (Trochilidae).  Journal of Experimental Biology 207:1345-1352. Download

McWhorter, T. J., D. R. Powers, C. Martinez del Rio. 2003.  Are Hummingbirds Facultatively Ammonotelic?  Nitrogen Excretion and Requirements as a Function of Body Size.  Physiological & Biochemical Zoology 76:731-743. Download

Powers, D. R., A. R. Brown, and J. A. Van Hook.  2003.  The influence of normal daytime fat deposition on laboratory measurements of torpor use in territorial vs. non-territorial hummingbirds.  Physiological & Biochemical Zoology 76:389-397. Download

Ficken, M. S.,  K. S. Rusch, S. J. Taylor, and D. R. Powers.  2002.  Reproductive behavior and communication in Blue-throated Hummingbirds.  Wilson Bulletin 114:197-209. Download

Ficken, M. S., K. S. Rusch, S. J. Taylor, and D. R. Powers.  2000.  Blue-throated Hummingbird song:  a pinnacle of non-oscine vocalizations. Auk 117:120-128. Download

Powers, D. R.  1999.  Family Trochilidae (Hummingbirds).  Pp. 536-680 In:  Del Hoyo, J., Elliott, A., and Sargatal, J., eds. (1999).  Handbook of the Birds of the World.  Vol. 5.  Barn owls to hummingbirds.  Lynx Edicions, Barcelona.

Powers, D. R. and S. M. Wethington. 1999.  Broad-billed Hummingbird (Cynanthus latirostris).  In The Birds of North America, No. 430 (A. Poole and F. Gill, Eds.).  The Birds of North America, Inc., Philadelphia, PA. Online

Powers, D. R. and T. Conley. 1994.  Metabolic rate and food consumption of two sympatric hummingbird species in southeastern Arizona.  Condor 96:141-150. Download

Powers, D. R. and T. McKee.  1994.  The effect of food availability on time and energy expenditures of territorial and non-territorial hummingbirds.  Condor 96:1064-1075. Download

Powers, D. R.  1992.  Effect of temperature and humidity on evaporative water loss in Anna’s Hummingbird (Calype anna).  Journal of Comparative Physiology B 162:74-84. Download

Powers, D. R. 1991.  Diurnal variation in mass, metabolic rate, and respiratory quotient in Anna’s and Costa’s Hummingbirds.  Physiological Zoology 64:860-880. Download

Powers, D. R. and K. A. Nagy. 1988. Field metabolic rate and food consumption by free-living Anna’s hummingbirds (Calypte anna). Physiological Zoology 61:500-506. Download

Powers, D. R. 1987. Effects of variation in food quality on the breeding territoriality of the male Anna’s hummingbird. Condor 89:103-111.  Download