NREM Faculty - Karen R. Hickman


476 Agricultural Hall (office)
008C Agricultural Hall (address)
Stillwater, OK 74078

Educational Background
BS:       1985 B.S., Oklahoma State University
PhD:    1996 PhD., Kansas State University



  • RLEM 4571    Senior Seminar
  • RLEM 5020    Graduate Seminar
  • RLEM 5760    Invasive Species

Research Interests:
My research program focuses primarily on addressing and understanding the effects of various management practices on plant and animal populations and communities within rangeland ecosystems of the Great Plains.  Native rangelands, grasslands, and pasturelands in Oklahoma as well as throughout the central and southern Great Plains are under new threats from invasion by exotic and native species and exurban sprawl, as well as traditional challenges associated with livestock and wildlife management.  My primary research goals are to further evaluate effects of management practices (e.g. grazing, patch burning, herbicide application, revegetation) on invasive species in Oklahoma grasslands, and to elucidate abiotic (e.g. fire, precipitation), plant-plant and plant-animal interactions that might be involved in limiting invasions of native systems by various invasive species.  Ultimately, my research goals are to establish collaborations with other researchers throughout the US and northern Mexico (i.e. Chihuahua) and continue to collaborate with researchers at OSU in order to conduct research whose results can be influential in the development and application of proper (and adoptable) land management practices. 

Recent Publications (since 2005)
Harmoney, K.R., P. Stahlman, P. Geier, K.R. Hickman.  2010. Rate and timing of glyphosate application to control Caucasian Old World bluestem (Bothriochloa bladhii).  Invasive Plant Science and Management.  3: 310-

*van Els, P., R. E. Will, M. W. Palmer and K. R. Hickman.  2010. Changes in forest understory associated with Juniperus encroachment in Oklahoma, USA. Applied Vegetation Science 13: 356-368.

Davis, C., J. Bidwell, K.R. Hickman. 2009.  Effects of hydrological regimes on competitive interactions of Schoenoplectus fluviatilis and two co-occurring wetland plants.  Aquatic Botany 91:267-272.

 *George, A.D., T.J. O’Connell, K.R. Hickman and D.M Leslie, Jr.  2009.  Influence of Old World Bluestem (Bothriochloa iscahemum) monoculture on breeding density of three grassland songbirds in Oklahoma.  Proceedings of the Fourth International Partners in Flight Conference.  Pages??

*Schmidt, C.D., K.R. Hickman, R. Channell, W.J. Stark, and K.R. Harmoney.  2008.  Competitive ability of native grasses and non-native (Old World Bluestems; Bothriochloa spp.) grasses.  Plant Ecology 197:69-80.

*Limb, R.F., K.R. Hickman, J. Norland, T.G. Bidwell, D.M. Engle, A. Alford.  2007.  Digital Photography: Reduced Investigator Variation in Visual Obstruction Measurements for Southern Tallgrass Prairie.  Rangeland Ecology and Management.  60:548-552.

Boyer, T. and K.R. Hickman. 2007.  Predicting First Semester Agricultural College Student’s College Performance. NACTA.  51:50-55.

Hickman, K.R. and J.D. Derner. 2007.  Vegetation change after cessation of herbicide application in Blackland Tallgrass Prairie.  Rangeland Ecology and Management. 60:186-190.

Harmoney, K.R., P.W. Stahlman, and K.R. Hickman. 2007.  Suppression of Caucasian Old World Bluestem by Split Application of Herbicides.  Journal of Weed Technology .  21:573-577.

Taggart, G., P. Adams, J. Hohman, J. Heinrichs, and K.R. Hickman.  2007.  Fermi Questions.  Mathematics Teaching in the Middle School.  13:164-167.  Reprinted in 2008 as:  Grade 6 – 10:  Fermi Questions.  Virginia Mathematics Teacher 35:38-40.

Hickman, K. R., G. H. Farley, R. Channell, and *J E. Steier.   2006.  Effects of Old World Bluestem (Bothriochloa ischaemum) on food availability and avian community composition within the mixed-grass prairie.  Southwestern Naturalists. 51:524-530.

*Schmidt, C.D. and K.R. Hickman. 2006.  Stolon production in Caucasian old world bluestem.  Transactions of the Kansas Academy of Science 109:74-76.

(graduate students are preceded by *)