Dr. David R. Stewart

Statistician (Biology)
Regional Office, Albuquerque
Phone: 505-248-6642
Email: david_stewart at fws.gov

“….. the actual and physical conduct of an experiment must govern the statistical procedures of its interpretation.” – R. A. Fisher

Scientific Interests:

My work broadly focuses on the field of Applied Statistics. My primary responsibilities are to develop sampling design, use design-based estimation, simulations, harvest-control strategies, and population models to better inform management and policy of fish and wildlife populations throughout the American Southwest.

Ph.D., 2013, Oklahoma State University, Natural Resource Ecology and Management (Statistics)
M.Sc., 2009, Middle Tennessee State University, Biometrics
B.Sc., 2006, Martin Methodist College, Biology (Pre-Medicine)

Awards, Scholarships, and Fellowships:

  • 2016: U.S. Fish and Wildlife Service – Southwest Region Early Career Professional of the Year
  • 2013: John E. Skinner Memorial Award, American Fisheries Society
  • 2013: Williams Distinguished Graduate Fellowship, Oklahoma State University
  • 2013: Murray-Gray Unit Service Award, Oklahoma Cooperative Fish and Wildlife Research Unit
  • 2013: Outstanding Fisheries Graduate Student Award, Oklahoma State University
  • 2013: Robert M. Jenkins Memorial Reservoir Scholarship, American Fisheries Society
  • 2010-2012: Sitlington Enriched Graduate Fellowship, Oklahoma State University
  • 2010-2013: Graduate Research Assistant Award, Oklahoma Cooperative Fish and Wildlife Research Unit
  • 2008: George C. Murphy Research Grant, Middle Tennessee State University
  • 2008: J. Gerald Parchment Biological Field Station Grant, Middle Tennessee State University


  1. Conroy, M. J., G. Harris, D. R. Stewart, and M. J. Butler. In Review. Evaluation of desert bighorn sheep abundance surveys in southwestern Arizona, USA.
  2. Parsley, P. M., S. E. Bergemann, M. E. Mueller, G. W. Benz, M. R. Gatlin, and D. R. Stewart.  In Review.  Aging bias and precision for Brook Trout (Salvelinus fontinalis), Brown Trout (Salmo trutta), and Rio Grande Cutthroat Trout (Oncorhynchus clarki virginalis): an evaluation of non-lethal versus lethal aging structures, and incorporating aging error into growth parameter estimates.
  3. Brewer, S. K., T. A. Worthington, R. Mollenhauer, D. R. Stewart, R. McManamay, L. Georgett, and D. Williams.  In Review.  Synthesizing models useful for ecohydrology and ecohydraulic approaches: An emphasis on integrating models to address complex research questions.
  4. Stewart, D. R., Z. E. Underwood, F. J. Rahel, and A. W. Walters.  2018. The effectiveness of surrogate taxa to conserve freshwater biodiversity. Conservation Biology 32:183-194. http://onlinelibrary.wiley.com/doi/10.1111/cobi.12967/full
  5. Carlisle, J. D., D. R. Stewart, and A. D. Chalfoun.  2017.  Habitat prioritization developed for sage-grouse doesn’t align with rangeland ant and lizard abundances. Western North American Naturalist 77:450-463. https://scholarsarchive.byu.edu/wnan/vol77/iss4/5/#.WmDDZGC9N4Q.twitter
  6. Stewart, D. R., M. J. Butler, G. Harris, and W. R. Radke.  2017.  Mark-recapture models identify imminent extinction of Yaqui catfish Ictalurus pricei in the United States. Biological Conservation 209:45-53.†Media: YaleEnvironment360, “In Southwest Borderlands, the Yaqui Catfish faces its final days” 23 February 2017 (http://e360.yale.edu/features/in-southwest-borderlands-the-yaqui-catfish-faces-its-final-days) and EarthTouchNews, “Yaqui catfish faces extinction in the US by 2018” 1 March 2017 (http://www.earthtouchnews.com/conservation/endangered/yaqui-catfish-faces-extinction-in-the-us-by-2018).
  7. Stewart, D. R., M. J. Butler, G. Harris, L. A. Johnson, and W. R. Radke. 2017.  Estimating abundance of endangered fish by eliminating bias from non-constant detectability.  Endangered Species Research 32:187-207.
  8. Long, J. M., D. R. Stewart, D. Balsman, J. Shiftlet, and D. E. Shoup. 2017.  Bait type influences catch and bycatch in tandem hoop nets set in reservoirs. Fisheries Research 186:102-108.
  9. Gibson-Reinemer, D. K., D. R. Stewart, A. Casper, M. W. Fritts, and J. A. DeBoer. 2016.  Estimating the effects of environmental variables and gear type on the detection and occupancy of large river fishes in a standardized sampling program using multi-season Bayesian mixture models.  North American Journal of Fisheries Management 36:1445-1456.
  10. Stewart, D. R., J. M. Long, and D. E. Shoup.  2016.  Simulation modeling to explore the effects of length-based harvest regulations for Ictalurus fisheries. North American Journal of Fisheries Management 36:1190-1204.
  11. Stewart, D. R., J. M. Long.  2016.  Using hierarchical Bayesian multi-species mixture models to estimate tandem hoop-net based habitat associations and detection probabilities of fishes in reservoirs.  Transactions of the American Fisheries Society. 145:450-461.
  12. Stewart, D. R., A. W. Walters, and F. J. Rahel.  2016.  Landscape-scale factors influencing native and nonnative Great Plains fish distributions.  Diversity and Distributions 22:225-238.
  13. Stewart, D. R., and J. M. Long.  2015.  Growth and contribution of stocked channel catfish Ictalurus punctatus (Rafinesque, 1818): the importance of measuring post-stocking performance.  Journal of Applied Ichthyology. doi:10.1111/jai.12797.
  14. Stewart, D. R., and J. M. Long. 2015.  Using an experimental manipulation to determine the effectiveness of a stock enhancement program.  Journal of Freshwater Ecology.  doi:10.1080/02705060.2015.1021715.
  15. Stewart, D. R., J. M. Long, and D. E. Shoup. 2015.  Spatial structuring within a reservoir fish population: implications for management.  Marine and Freshwater Research 66:202-212. doi:10.1071/MF14085.
  16. Stewart, D. R. 2014.  Kansas lotic and lentic conservation and management of Channel Catfish Ictalurus punctatus.  Kansas Fishes.  University of Press Kansas, Lawrence.
  17. Cartabiano, E., D. R. Stewart, and J. M. Long. 2014.  Effect of bait and gear type on channel catfish and turtle bycatch catch statistics in a reservoir.  Journal of Freshwater Ecology. doi:10.1080/02705060.2014.966165. †Media: FishSens Magazine, “Laundry soap-baited trotlines may be the answer to turtle killing catfish nets” 13 January 2015 (http://magazine.fishsens.com/laundry-soap-baited-trotlines-may-answer-turtle-killing-catfish-nets.htm).
  18. Stewart, D. R., G. D. Schotlen, T. N. Churchill, and J. M. Fly.  2012.  Angler opinions of catfish management in Tennessee.  Proceedings of the Southeastern Association of Fish and Wildlife Agencies 66:88-93.
  19. Stewart, D. R., and J. M. Long. 2012.  Precision of channel catfish catch estimates in medium size impoundments in Oklahoma.  North American Journal of Fisheries Management 32:1108-1112.
  20. Stewart, D. R., and J. M. Long. 2011. The efficacy of mass-marking channel catfish Ictalurus punctatus fingerlings using oxytetracycline.  Proceedings of the Oklahoma Academy of Science 91:31-36.
  21. Long, J. M., and D. R. Stewart. 2010.  Verification of otolith identity used by fisheries managers for aging channel catfish Ictalurus punctatus.  Transactions of the American Fisheries Society 139:1775-1779.
  22. Stewart, D. R., and G. W. Benz, and G. D. Scholten.  2009.  Weight-length relationships and growth data for blue catfish Ictalurus furcatus among four Tennessee waterbodies.  Proceedings of the Southeastern Association of Fish and Wildlife Agencies 63:140-146.2.
  23. Ulicny, K. J., D. R. Stewart, A. McElwain, E. R. Salmon, S. A. Bullard, J. O. Cook, G. D. Skomal, H. L. Pratt, Jr., and G. W. Benz.  2007.  Sealing Whirl-Pak®-type bags containing wet samples.  Tennessee Academy of Science 88-89.