Cooperative Research Units
Education, Research And Technical Assistance For Managing Our Natural Resources
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Dr. Perry Williams

Research Publications

  • Williams, P.J., M.B. Hooten, J.N. Womble, G.G. Esslinger, and M.R. Bower. (2018). Monitoring dynamic spatio-temporal ecological processes optimally. Ecology, 99: 524-535.
  • Williams, P.J., M.B. Hooten, J.N. Womble, G.G. Esslinger, M.R. Bower, and T.J. Hefley. (2017). Estimating occupancy and abundance using aerial images with imperfect detection. Methods in Ecology and Evolution, 8: 1679-1689.
  • Williams, P.J., M.B. Hooten, J.N. Womble, G.G. Esslinger, M.R. Bower, and T.J. Hefley. (2017). An integrated data model to estimate spatio-temporal occupancy, abundance, and colonization dynamics. Ecology, 98: 328-336.
  • Williams, P.J. and M.B. Hooten. (2016). Combining statistical inference and decisions in ecology. Ecological Applications, 26: 1930-1942.
  • Williams, P. J., and W. L. Kendall. A guide to multi-objective optimization for ecological problems with an application to cackling goose management. Ecological Modelling, in press.
  • Crimmins, S. M., P. C. McKann, J. R. Robb, J. P. Lewis, T. Vanosdol, B. A. Walker, P. J. Williams, and W. E. Thogmartin. 2016. Factors affecting Henslow's sparrow (Ammodramus henslowii) nest survival in southern Indiana. Wilson Journal of Ornithology 128:1:10.
  • Vigil, E., M. K. C. Christianson, J. M. Lepak, and P. J. Williams. 2016. Temperature effets on hatching and viability of juvenile gill lice; Salmincola californiensis. Journal of Fish Diseases. Early View
  • Gerber, B. D., P. J. Williams, L. L. Bailey. 2014. Primates and Cameras: Non-invasive sampling to make population-level inferences while accounting for imperfect detection. International Journal of Primatology 35:841--858.
  • Williams, P.J., S. A. Whitmore, R.J. Gutierrez. 2014. Use of private lands for foraging by California spotted owls in the central Sierra Nevada. Widlife Society Bulletin 35:705--709. Abstract | 
  • Williams, P.J., N. J. Engbrecht, J. R. Robb, V. C. K. Terrell, and M. J. Lannoo. 2013. Surveying a threatened amphibian species through a narrow detection window. Copiea 2013(3):553-562.
  • N Engbrecht, M Lannoo, P Williams, J Robb, T Gerardot, D Karns, M Lodato. 2013. Is There Hope for the Hoosier Frog? An Update on the Status of Crawfish Frogs (Lithobates areolatus) in Indiana, with Recommendations for their Conservation. Proceedings of the Indiana Academy of Science 121 (2), 147-157
  • Williams, P. J., J. R. Robb, and D. R. Karns. 2012. Habitat selection by crawfish frogs (Lithobates areolatus) in a large mixed grassland/forest habitat. Journal of Herpetology 46:682--688
  • Williams, P. J., J. R. Robb, and D. R. Karns. 2012. Occupancy dynamics of breeding crawfish frogs in southeastern Indiana. Wildlife Society Bulletin 36:350--357.
  • Williams, P. J., J. R. Robb, R. H. Kappler, T. E Piening, and D. R. Karns. 2012. Intraspecific density dependence in larval development of the crawfish frog, Lithobates areolatus. Herpetological Review 43:36-38.
  • Heemeyer, J. L., P. J. Williams, M. J. Lannoo. 2012. Obligate Crayfish Burrow Use and Core Habitat Requirements of Crawfish Frogs. Journal of Wildlife Management. Abstract |  Download  |  Publisher Website | 
  • Williams, P. J., R. J. Gutierrez, and S. A. Whitmore. 2011. Home range and habitat selection of spotted owls in the central Sierra Nevada. Journal of Wildlife Management 75:333-343. Download  |  Publisher Website | 
  • Hoffman, A. S., J. L. Heemeyer, P. J. Williams, J. R. Robb, D. R. Karns, V. C. Kinney, N. J. Engbrecht, and M. J. Lannoo. 2010. Strong site fidelity and a variety of imaging techniques reveal around-the-clock and extended activity patterns in crawfish frogs (Lithobates areolatus). BioScience 60:829-834. Download  | 
  • Schook, D. M., M. D. Collins, W. E. Jensen, P. J. Williams, N. E. Bader, and T. H. Parker. 2008. Geographic patterns of song similarity in the dickcissel (Spiza Americana). Auk 125:953-964. Download  | 

Current Staff

Federal Staff: 3

Masters Students: 5

Phd Students: 2

Post Docs: 2

University Staff: 1

5 Year Summary

Students graduated: 21

Scientific Publications: 86

Presentations: 103


Contact Us

Colorado Cooperative Fish and Wildlife Research Unit Fort Collins, CO 80523-1484 Phone: (970) 491 - 5396 Fax: (970) 491 - 1413 Our University Web Site

Unit Leader

Dana Winkelman
Dana Winkelman-Unit Leader

I received my BS degree in biology in 1984 and my MS degree in Biology in 1987 at the University of Nevada, Reno. I received my PhD in zoology from the University of Georgia in 1994. I joined the Cooperative Research Unit program in 1998 as Assistant Unit Leader at the Oklahoma Cooperative Fish and Wildlife Research Unit. In 2003 I became the Unit Leader at the Colorado Cooperative Fish and Wildlife Research Unit.

Colorado Cooperative Fish and Wildlife Research Unit Cooperators

  1. Colorado Parks and Wildlife
  2. Colorado State University
  3. U.S. Fish and Wildlife Service
  4. U.S. Geological Survey
  5. Wildlife Management Institute