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Dr. Randy Stahl


      Dr. Randy Stahl, Chemist



Dr. Stahl's research includes areas of method development to detect disease, modeling to predict physiological responses to repellents, and bioenergetics.

NWRC Research Project: Analytical Chemistry

Current Research

Developing non-invasive analytical methods to detect TB in breath or fecal samples as means of identifying infection in a wildlife population. Also developing bioenergetics models to estimate climate effects on poikilotherms with an emphasis on understanding climate constraints on survival. Using QSAR modelling to predict physiological response to repellents and toxicants in target organisms with the objective of understanding how compounds with similar molecular structure elicit a response.


  • Ph.D., University of Maryland
  • M.S., Texas A&M University
  • B.S., University of Tennessee


Contact Information

  • Address: NWRC, 4101 LaPorte Avenue, Fort Collins, CO 80521-2154
  • Telephone 970-266-6062
  • Fax: 970-266-6063
  • E-Mail:

Recent Publications


Carlson, J.C., R.S. Stahl, S.T. DeLiberto, J.J. Wagner, T.E. Engle, R.M. Engeman, C.S. Olson, J.W. Ellis, and S.J. Werner. 2018. Nutritional depletion of total mixed rations by European Starlings: Projected effects on dairy cow performance and potential intervention strategies to mitigate damage. Journal of Dairy Science 101(2):1777-1784. doi: 10.3168/jds.2017-12858


Carlson, J.C., R.S. Stahl, S.T. Deliberto, J.J. Wagner, T.E. Engle, R.M. Engeman, C.S. Olson, J.W. Ellis, and S.J. Werner. 2017. Nutritional depletion of total mixed rations by European starlings: Projected effects on dairy cow performance and potential intervention strategies to mitigate damage. Journal of Dairy Science 101:1777-1784. doi: 10.3168/jds.2017-12858

Dorr, B.S., R.S. Stahl, K.C. Hanson-Dorr, and C.A. Furcolow. 2017. Using pentosidine and hydroxyproline to predict age and sex in an avian species. Ecology and Evolution 7(21):8999-9005. doi: 10.1002/ece3.3388

Ellis, C.K., S. Rice, D. Maurer, R. Stahl, W.R. Waters, M.V. Palmer, P. Nol, J.C. Rhyan, K.C. VerCauteren, and J.A. Koziel. 2017. Use of fecal volatile organic compound analysis to discriminate between non-vaccinated and BCG-vaccinated cattle prior to and after Mycobacterium bovis challenge. PLoS One 12(7):e0179914. doi: 10.1371/journal.pone.0179914

Iverson, J.B., R.S. Stahl, C. Furcolow, and F. Kraus. 2017. An evaulation of the use of pentosidine as a biomarker for ageing turtles.Conservation Physiology 5(1):cow076.  doi: 10.1093/conphys/cow076 

Kraus, F., R. Stahl, and W. Pitt. 2017. An assessment of radiative heating as a thermal treatment for invasive snakes in cargo. International Journal of Pest Management 2:1-12. doi: 10.1080/09670874.2017.1293309


Stahl, R.S., N. Borchert, C. Heuser, R. Woodruff, and M. Tobin. 2016. The USDA APHIS WS unified model for estimating DRC-1339 bait application take estimates as effected by french fry bait size.  Proceedings of the 27th Vertebrate Pest Conference 27:240-243.

Stahl, R.S., R.M. Engeman, M.L. Avery, and R.E. Mauldin. 2016. Weather constraints on Burmese python survival in the Florida Everglades, USA based on mechanistic bioenergetics estimates of core body temperature. Cogent Biology. Online.  doi: 10.1080/23312025.2016.1239599

Kimball, B.A., S.A. Stelting, T.W. McAuliffe, R.S. Stahl, R.A. Garcia, and W.C. Pitt. 2016. Development of artificial bait for brown treesnake suppression. Biological Invasions 18:359-369.  doi: 10.1007/s10530-015-1031-z  


Stahl R.S., C.K. Ellis, P. Nol, W.R. Waters, M. Palmer, and K.C. VerCauteren. 2015. Fecal volatile organic compound profiles from white-tailed deer (Odocoileus virginianus) as indicators of Mycobacterium bovis exposure or Mycobacterium bovis Bacille Calmette-Guerin (BCG) vaccination. PLoS ONE online 10.1371/journal.pone.0129740.  doi: 10.1371/journal.pone.0129740

Kraus, F., R. Stahl, and W. Pitt. 2015. Thermal fumigation provides a simple and effective solution for sanitizing cargo from invasive snakes. Journal of Pest Science 88(3):331-341.  doi: 10.1007/s10340-014-0627-x

Kraus, F., R. Stahl, and W. Pitt. 2015. Chemical repellents appear non-useful for eliciting exit of brown tree snakes from cargo. International Journal of Pest Management 61(2):144-152. doi: 10.1080/09670874.2015.1023870


Lavelle, M.J., G.E. Phillips, J.W. Fischer, P.W. Burke, N.W. Seward, R.S. Stahl, T.A. Nichols, B.A. Wunder, and K.C. VerCauteren. 2014. Mineral licks: motivational factors for visitation and accompanying disease risk at communal use sites of elk and deer.  Environmental Geochemistry and Health 36(6):1049-1061.   doi: 10.1007/s10653-014-9600-0  

Goldade, D.A., R.S. Stahl, and J.J. Johnston. 2014. Determination of residue levels of alpha-chloralose in duck tissues. Human-Wildlife Interactions 8(1):123-129.

Ellis, C.K., R.S. Stahl, P. Nol, W.R. Waters, M.V. Palmer, J.C. Rhyan, K.C. VerCauteren, M.McCollum, M.D. Salman. 2014. A pilot study exploring the use of breath analysis to differentiate healthy cattle from cattle experimentally infected with Mycobacterium bovis. PloS One 9(2): e89280. doi: 10.1371/journal.pone.0089280.


Homan H.J., Stahl R.S., Linz G.M. 2013. Comparison of two models for estimating mortality from baitings with Compound DRC-1339 Concentrate avicide. Crop Protection 45:71-75. doi: 10.1016/j.cropro.2012.11.011.

Other selected publications

Homan H.J., Stahl R.S., Linz G.M. 2011. Comparing a bioenergetics model with feeding rates of caged European starlings. Journal of Wildlife Management 75:126-131.

Peled N., Ionescu R., Nol P., Barash O., McCollum M., Vercauteren K., Koslow M., Stahl R., Rhyan J., Haick H. 2012. Detection of volatile organic compounds in cattle naturally infected with Mycobacterium bovis. Sensors and Actuators, B: Chemical 171-172:588-594.

Pitt W.C., Stahl R., Yoder C.A. 2010. Emerging challenges of managing island invasive species: potential invasive species unintentionally spread from military restructuring. Proceedings of the Vertebrate Pest Conference 24:5-8. 

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