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  Home > People > Directory > Personnel Biographies
Picture of Researcher

Tom Spies

Phone: (541) 750-7354
Fax: (541) 750-7329
Primary Email:
Alternative Email:

USDA Forest Service
Pacific NW Research Station
3200 SW Jefferson Way
Corvallis, OR 97331

Official position at address above: Research Forest Ecologist
Educational Institutions attended: Ph.D., 1983, Natural Resources, University of Michigan, Ann Arbor
MS, 1978, Natural Resources, University of Michigan, Ann Arbor
BS, 1974, Natural Resources, University of Michigan, Ann Arbor
Roles/Affiliations: Professor (courtesy), Oregon State University
Long-Term Ecological Research (LTER)
General Interests: Forest ecology, Landscape ecology
Current Research Projects/Activities: Gap dynamics, Integrated regional models, Conservation biology, Old-growth forest ecology


Zald, Harold S.J.; Spies, Thomas A.; Seidl, Rupert; Pabst, Robert J.; Olsen, Keith A.; Steel, E. Ashley. 2016. Complex mountain terrain and disturbance history drive variation in forest aboveground live carbon density in the western Oregon Cascades, USA. Forest Ecology and Management. 366: 193-207. doi: 10.1016/j.foreco.2016.01.036 (Pub No: 4924)
Tepley, A. J., F. J. Swanson, and T. A. Spies. 2014. Post-fire tree establishment and early cohort development in conifer forests of the western Cascades of Oregon, USA. Ecosphere 5(7):80. http://dx.doi.org/10.1890/ES14-00112.1 (Pub No: 4863)
Tepley, Alan J.; Swanson, Frederick J.; Spies, Thomas A. 2013. Fire-mediated pathways of stand development in Douglas-fir/western hemlock forests of the Pacific Northwest, USA. Ecology. 94(8): 1729-1743. (Pub No: 4839)
Driscoll, Charles T.; Lambert, Kathleen F.; Chapin, F. Stuart III; Nowak, David J..; Spies, Thomas A.; Swanson, Frederick J.; Kittredge, David B. Jr.; Hart, Clarisse M. 2012. Science and society: the role of long-term studies in environmental stewardship. BioScience. 62(4):354-366. DOI:10.1525/bio.2012.62.4.7. (Pub No: 4670)
Gray, Andrew N., Spies, Thomas A., and Pabst, Robert J. 2012. Canopy gaps affect long-term patterns of tree growth and mortality in mature and old-growth forests in the Pacific Northwest. Forest Ecology and Management 281:111-120. (Pub No: 4781)
Seidl, Rupert; Rammer, Werner; Scheller, Robert M.; Spies, Thomas A. 2012. An individual-based process model to simulate landscape-scale forest ecosystem dynamics. Ecological Modelling. 231: 87-100. (Pub No: 4649)
Seidl, Rupert., Spies, Thomas A., Rammer, Werner., Steel, E. Ashley., Pabst, Robert. J., Olsen, Keith. 2012. Multi-scale Drivers of Spatial Variation in Old-Growth Forest Carbon Density Disentangled with Lidar and an Individual-Based Landscape Model. Ecosystems. Ecosystems 15:1321-1335. DOI: 10.1007/s10021-012-9587-2 (Pub No: 4792)
Thompson, Jonathan R.; Wiek, Arnim; Swanson, Frederick J.; Carpenter, Stephen R.; Fresco, Nancy; Hollingsworth, Teresa; Spies, Thomas A.; Foster, David R. 2012. Scenario studies as a synthetic and integrative research activity for Long-Term Ecological Research. BioScience. 64(4):367-376. DOI:10.1525/bio.2012.62.4.8. (Pub No: 4669)
Zald, Harold S. J.; Spies, Thomas A.; Huso, Manuela; Gatziolis, Demetrios. 2012. Climatic, landform, microtopographic, and overstory canopy controls of tree invasion in a subalpine meadow landscape, Oregon Cascades, USA. Landscape Ecology. 27:1197-1212. doi:10.1007/s10980-012-9774-8. (Pub No: 4662)
Halofsky, J. E.; Donato, D. C.; Hibbs, D. E.; Campbell, J. L.; Cannon, M. Donaghy; Fontaine, J. B.; Thompson, J. R.; Anthony, R. G.; Bormann, B. T.; Kayes, L. J.; Law, B. E.; Peterson, D. L.; Spies, T. A. 2011. Mixed-severity fire regimes: lessons and hypotheses from the Klamath-Siskiyou ecoregion. Ecosphere. 2(4): Article 40 [1-19]. (Pub No: 4659)
Moeur, M.; Ohmann, J. L.; Kennedy, R. E.; Cohen, W. B.; Gregory, M. J.; Yang, Z.; Roberts, H. M.; Spies, T. A.; Fiorella, M. 2011. Status and trends of late-successional and old-growth forests. Gen. Tech. Rep. PNW-GTR-853. Portland, OR: U.S. Department of Agriculture, Forest Service, Pacific Northwest Research Station. 48p. (Pub No: 4671)
Perry, David A.; Hessburg, Paul F.; Skinner, Carl N.; Spies, Thomas A.; Stephens, Scott L.; Taylor, Alan Henry; Franklin, Jerry F.; McComb, Brenda; Riegel, Greg. 2011. The ecology of mixed severity fire regimes in Washington, Oregon, and Northern California. Forest Ecology and Management. 262: 703-717. (Pub No: 4664)
Thompson, Jonathan R.; Spies, Thomas A.; Olsen, Keith A. 2011. Canopy damage to conifer plantations within a large mixed-severity wildfire varies with stand age. Forest Ecology and Management. 262(3):355-360. doi:10.1016/j.foreco.2011.04.001 (Pub No: 4663)

Personal Information:

Hometown: Menominee, Michigan
Personal Interests: Family, landscaping, skiing, reading.