Eric Jorgensen, Ecologist
Dr. Jorgensen's research program is multidisciplinary and features holistic thinking, teamwork, and collaboration. Co-investigators include zoologists, range scientists, physiologists, soil scientists, biogeochemists, and microbiologists from the U.S. Geological Survey, Universities, the Department of Defense, and several states. This group has been actively investigating risk associated with chronic exposure of ecosystems to low levels of nitrate, particularly related to atmospheric nitrate deposition, ecosystem interactions and feedback, and aquatic/terrestrial interactions.
Dr. Jorgensen has been a primary developer of EPA's research agenda with regard to ecosystem restoration. Development of this program has involved a significant effort of representation, consensus building, and collaboration within EPA and among other federal agencies, state governments, and universities.
Dr. Jorgensen is beginning a new research area that will incorporate ecological values into brownfield restoration and redevelopment. He has written more than 50 papers that are published or are in review, with topics on ecological modeling, mammalian ecology and diversity, ecosystem management and restoration, soil science and biogeochemistry, and avian, herpetofauna, and plant community ecology.
Jorgensen, E.E. (In press). “Small Mammal Use of Microhabitat.” Journal of Mammalogy.
Jorgensen, E.E. and S.L. Yarbrough. (In press). “Ecosystem Restoration to Restore Water Quality; An Unrealized Opportunity for Practitioners and Researchers.” EPA document.
Mayer, P.M., S.J. Tunnell, D.M. Engle, E.E. Jorgensen, and P. Nunn. (In press). “Invasive Grass Alters Litter Decomposition by Influencing Macro Detritivores.” Ecosystems.
Tunnell, S.J., D.M. Engle, and E.E. Jorgensen. (In press). “Old Field Successional Dynamics Following Cessation of Chronic Disturbance.” Journal of Vegetation Science.
Clark, J.E., E.C. Hellgren, E.E. Jorgensen, S.M. Tunnell, D.M. Engle, and D.M. Leslie, Jr. (2003). “Population Dynamics of Hispid Cotton Rats (Sigmodon hispidus) Across a Nitrogen- Amended Landscape.” Canadian Journal of Zoology, 81: 994–1003.
Clark, J.E., J.L. Parsons, E.C. Hellgren, and E.E. Jorgensen. (2003). “Nitrogen Concentration of Stomach Contents as an Index of Dietary Nitrogen for Hispid Cotton Rats (Sigmodon hispidus).” Journal of Mammalogy, 84: 1399–1409.
Jorgensen, E.E., S. Holub, G. Silva, P.M. Mayer, A.E. West, M.E. Gonsoulin, S.J. Tunnell, J.E. Clark, J.L. Parsons, D.M. Engle, and E.C. Hellgren. (2003). “Sources and Estimated Load of Bioavailable Nitrogen Attributable to Chronic Nitrogen Exposure and Changed Ecosystem Structure and Function.” In: Proceedings First Interagency Conference on Research in the Watersheds, Benson, Arizona. pp. 614–618.
Jorgensen, E.E. Advances in Restoration Science, Number 2: Opportunities in Nitrogen Management Research; Improving Applications for Proven Technologies and Identifying New Tools for Managing Nitrogen Flux and Input in Ecosystems – Issue Paper (6 pp, 128 KB) (EPA/600/S-02/003) June 2002
Jorgensen, E.E., T.J. Canfield, and P.M. Mayer. Research Needs in Riparian Buffer Restoration – Advances in Restoration Science, Number 1 (PDF) (7 pp, 1.49 MB) (EPA/600/S-02/002) June 2002
Jorgensen, E.E. (2002). “Small Mammals: Consequences of Stochastic Data Variation for Modeling Indicators of Habitat Suitability for a Well-Studied Resource.” Ecological Indicators, 1: 313–321.
Jorgensen, E.E. (2001). “Emission of Volatile Compounds by Seeds Under Different Environmental Conditions.” American Midland Naturalist, 145: 419–422.
Jorgensen, E.E., T.J. Canfield, and F.W. Kutz. (2000). “Restored Riparian Buffers as Tools for Ecosystem Restoration in the MAIA; Processes, Endpoints, and Measures of Success for Water, Soil, Flora, and Fauna.” Environmental Monitoring and Assessment, 63: 199–210.
Jorgensen, E.E. (2000). “Dispersal as a Mechanism Limiting Diversity of High Latitudes.” Biota, 1: 67–76.
Jorgensen, E.E. and S. Demarais. (1999). “Spatial Scale Dependence of Rodent Habitat Use.” Journal of Mammalogy, 80: 421–429.
Jorgensen, E.E. and S. Demarais. (1999). “A Comparison of Modelling Techniques for Small Mammal Diversity.” Ecological Modelling, 120: 1–8.
Demarais, S., D.J. Tazik, P. Guertin, and E.E. Jorgensen. (1999). “Disturbance Associated With Military Impacts.” In Ecosystems of Disturbed Ground. Edited by L.R. Walker. Elsevier, Amsterdam, Holland. pp. 385–396.
Jorgensen, E.E., S. Demarais, S.M. Sell, and S.P. Lerich. (1998). “Modeling Habitat Suitability for Small Mammals in Chihuahuan Desert Foothills of New Mexico.” Journal of Wildlife Management, 62: 989–996.
Jorgensen, E.E., C. Geron, and G.W. Sewell. Risk Management Research Plan for Ecosystem Restoration in Watersheds (EPA/600/R-97/078) September 1997
Jorgensen, E.E. and L.E. Nauman. (1994). “Disturbance Gradients in Wetlands Associated With Commercial Cranberry Production in Wisconsin.” American Midland Naturalist, 132: 152–158.