Profile Pic Tim Assal

Timothy Assal

Department of Geography
Assistant Professor
Contact Information
Vegetation dynamics & disturbance; landscape ecology; biogeography; remote sensing; spatial statistics


Tim is a biogeographer, landscape ecologist, and applied remote sensing scientist studying the effects of disturbance on forest and shrubland ecosystems. He combines field studies, satellite sensors, and computer modeling to identify when, where and why change took place – typically through a measure of the rate and pattern of environmental change. His primary goal is to provide sound science to both resource managers and policy makers to help shape ecosystem management and conservation as we move into an uncertain future.


B.S. Environmental Studies; The George Washington University, M.S. Botany; University of Wyoming, Ph.D. Ecology; Colorado State University


Spatial Ecology; landscape ecology; biogeography; remote sensing; vegetation dynamics & disturbance


  • Vandever, MW., S.K. Carter, T.J. Assal, et al. 2021. Evaluating establishment of conservation practices in the Conservation Reserve Program across the central and western United States. Environmental Research Letters 16:074011.
  • Assal, T.J., V.A., Steen, T. Caltrider, T. Cundy, C. Stewart, N. Manning, and P.J. Anderson, 2021. Monitoring long-term riparian vegetation trends to inform local habitat management in a mountainous environment. Ecological Indicators 127:107807.
  • Monroe, A.P., D.R. Edmunds, C.L. Aldridge, M.J. Holloran, T.J. Assal, A.G. Holloran, 2021. Prioritizing market-based conservation programs for grassland birds with hierarchical community models. Landscape Ecology 36:1023-1038.
  • Germaine, S., T.J. Assal, A. Freeman, and S.K. Carter, 2020. Distance effects of gas field infrastructure on pygmy rabbits in southwestern Wyoming. Ecosphere 11(8): e03230. 10.1002/ecs2.3230
  • Coop, J., S. Parks, C. Stevens-Rumann, (and others including T.J. Assal), 2020. Wildfire-driven forest conversion in western North American landscapes. BioScience 70(8):659-673
  • Assal,T.J. 2020. Quaking Aspen: The Iconic and Dynamic Deciduous Tree of the Rocky Mountains. Pages 20-28 in M.J. Keables. Editor. The Rocky Mountain West: A Compendium of Geographic Perspectives. American Association of Geographers, Washington, D.C.
  • Assal, T.J., González, M.E., and Sibold, J.S., 2018. Burn severity controls on postfire Araucaria‐Nothofagus regeneration in the Andean Cordillera: Journal of Biogeography: 45(11):2483-2494
  • Carlson, A.R., J. Sibold, T.J. Assal, and J. Negron, 2017. Evidence of Compounded Disturbance Effects on Vegetation Recovery Following High-Severity Wildfire and Spruce Beetle Outbreak. PLoS One 12(8): e0181778.
  • Monroe, A.P., C.L. Aldridge, T.J. Assal, K.E. Veblen, D.A. Pyke, M.L. Casazza, 2017. Patterns in Greater Sage-grouse population dynamics correspond with public grazing records at broad scales. Ecological Applications 27(4):1096-1107
  • Malone, S.L., M.G. Tulbure, A.J. Perez, T.J. Assal, L.L. Bremer, D.P. Drucker, V. Hillis, S. Varela, and M. Goulden, 2016. Drought resilience across California ecosystems: evaluating changes in carbon dynamics using satellite imagery. Ecosphere 7:1-19
  • Assal, T.J., Anderson, P., Sibold, J., 2016. Spatial and Temporal Trends of Drought Effects in a Heterogeneous Semi-Arid Forest. Forest Ecology and Management 365:137-151.
  • Assal, T.J., C.P. Melcher, and N.B. Carr (eds.), 2015. Southern Great Plains Rapid Ecoregional Assessment - PreAssessment Report: U.S. Geological Survey Open-File Report 2015–1003. 284 p.
  • Assal, T.J., Anderson, P., Sibold, J., 2015. Mapping forest functional type in a forest-shrubland ecotone using SPOT imagery and predictive habitat distribution modelling. Remote Sensing Letters 6:755–764.
  • Assal, T.J., J. Sibold, and R. Reich. 2014. Modeling an Historical Mountain Pine Beetle Outbreak Using Multiple Lines of Evidence. Remote Sensing of Environment 155:275-288.
  • O’Donnell, M., T.J.Assal, P.J. Anderson, and Z.H. Bowen. 2014. Geospatial Considerations for a Multi-Organization Landscape-Scale Program. Journal of Map and Geography Libraries 10(1):62-99.
  • K.E. Veblen, D.A. Pyke, C.L. Aldridge, M.E. Cassaza, T.J. Assal, and M.A. Farinha. 2014. Monitoring of Livestock Grazing Effects on the Bureau of Land Management Land. Rangeland Ecology and Management 67(1):68-77.
  • Assal, T.J. and J.M. Montag. 2012. A Tale of Two Land Uses in American West: Rural Residential Growth and Energy Development. Journal of Maps 8(4): 327-333.
  • Assal, T.J. and J.A. Lockwood. 2007. Utilizing remote sensing and GIS to the detect prairie dog colonies. Rangeland Ecology and Management 60:45-53.


Ecological Society of America, American Geophysical Union, American Association of Geographers


Research Institutes and Initiatives

Environmental Science and Design Research Initiative